4.0 head on a 4.2 questions
08-03-2005, 06:41 PM
#1
Guest
Posts: n/a
4.0 head on a 4.2 questions
Hey guys,
I've read Tim Weaver's excellent article on installing a 4.0 head on a 4.2
block ( http://monsterslayer.com/jeep/40Head/40Head.htm ) and am preparing
to do the same to my 84 CJ7. I'm wondering if anyone in this group has
swapped a factory Cherokee 4.0 fuel injection system into an earlier model
vehicle. I know I'm going to need the wiring harness, the computer (ECM), as
well as the manifold with the MAF, Temp sensor, TPS, etc., etc.. Other than
installing an O2 sensor in the exhaust is there anything I'm overlooking? I
will not be running a catalytic converter. This seems to be a pretty heads
up swap and I really would like to avoid a $2,000.00 bill for a fuel
injection system.
While I'm at it I'll probably change the ignition to the later model
computer controlled ignition.
Any and all input is greatly appreciated.
Thanks,
Charles E.
84 CJ7
92 Cherokee
81 DJ5L
I've read Tim Weaver's excellent article on installing a 4.0 head on a 4.2
block ( http://monsterslayer.com/jeep/40Head/40Head.htm ) and am preparing
to do the same to my 84 CJ7. I'm wondering if anyone in this group has
swapped a factory Cherokee 4.0 fuel injection system into an earlier model
vehicle. I know I'm going to need the wiring harness, the computer (ECM), as
well as the manifold with the MAF, Temp sensor, TPS, etc., etc.. Other than
installing an O2 sensor in the exhaust is there anything I'm overlooking? I
will not be running a catalytic converter. This seems to be a pretty heads
up swap and I really would like to avoid a $2,000.00 bill for a fuel
injection system.
While I'm at it I'll probably change the ignition to the later model
computer controlled ignition.
Any and all input is greatly appreciated.
Thanks,
Charles E.
84 CJ7
92 Cherokee
81 DJ5L
08-04-2005, 06:52 AM
#2
Guest
Posts: n/a
Re: 4.0 head on a 4.2 questions
Be advised the Cherokees have two totally different computer systems with
different heads and manifolds. As I recall there's even differences in
different years of the "HO" heads.
JoBo
"Ervin Charles" <charleserv@charter.net> wrote in message
news:PKbIe.3223$c45.1774@fe05.lga...
> Hey guys,
> I've read Tim Weaver's excellent article on installing a 4.0 head on a
> 4.2 block ( http://monsterslayer.com/jeep/40Head/40Head.htm ) and am
> preparing to do the same to my 84 CJ7. I'm wondering if anyone in this
> group has swapped a factory Cherokee 4.0 fuel injection system into an
> earlier model vehicle. I know I'm going to need the wiring harness, the
> computer (ECM), as well as the manifold with the MAF, Temp sensor, TPS,
> etc., etc.. Other than installing an O2 sensor in the exhaust is there
> anything I'm overlooking? I will not be running a catalytic converter.
> This seems to be a pretty heads up swap and I really would like to avoid a
> $2,000.00 bill for a fuel injection system.
> While I'm at it I'll probably change the ignition to the later model
> computer controlled ignition.
> Any and all input is greatly appreciated.
> Thanks,
> Charles E.
> 84 CJ7
> 92 Cherokee
> 81 DJ5L
>
different heads and manifolds. As I recall there's even differences in
different years of the "HO" heads.
JoBo
"Ervin Charles" <charleserv@charter.net> wrote in message
news:PKbIe.3223$c45.1774@fe05.lga...
> Hey guys,
> I've read Tim Weaver's excellent article on installing a 4.0 head on a
> 4.2 block ( http://monsterslayer.com/jeep/40Head/40Head.htm ) and am
> preparing to do the same to my 84 CJ7. I'm wondering if anyone in this
> group has swapped a factory Cherokee 4.0 fuel injection system into an
> earlier model vehicle. I know I'm going to need the wiring harness, the
> computer (ECM), as well as the manifold with the MAF, Temp sensor, TPS,
> etc., etc.. Other than installing an O2 sensor in the exhaust is there
> anything I'm overlooking? I will not be running a catalytic converter.
> This seems to be a pretty heads up swap and I really would like to avoid a
> $2,000.00 bill for a fuel injection system.
> While I'm at it I'll probably change the ignition to the later model
> computer controlled ignition.
> Any and all input is greatly appreciated.
> Thanks,
> Charles E.
> 84 CJ7
> 92 Cherokee
> 81 DJ5L
>
08-04-2005, 06:52 AM
#3
Guest
Posts: n/a
Re: 4.0 head on a 4.2 questions
Be advised the Cherokees have two totally different computer systems with
different heads and manifolds. As I recall there's even differences in
different years of the "HO" heads.
JoBo
"Ervin Charles" <charleserv@charter.net> wrote in message
news:PKbIe.3223$c45.1774@fe05.lga...
> Hey guys,
> I've read Tim Weaver's excellent article on installing a 4.0 head on a
> 4.2 block ( http://monsterslayer.com/jeep/40Head/40Head.htm ) and am
> preparing to do the same to my 84 CJ7. I'm wondering if anyone in this
> group has swapped a factory Cherokee 4.0 fuel injection system into an
> earlier model vehicle. I know I'm going to need the wiring harness, the
> computer (ECM), as well as the manifold with the MAF, Temp sensor, TPS,
> etc., etc.. Other than installing an O2 sensor in the exhaust is there
> anything I'm overlooking? I will not be running a catalytic converter.
> This seems to be a pretty heads up swap and I really would like to avoid a
> $2,000.00 bill for a fuel injection system.
> While I'm at it I'll probably change the ignition to the later model
> computer controlled ignition.
> Any and all input is greatly appreciated.
> Thanks,
> Charles E.
> 84 CJ7
> 92 Cherokee
> 81 DJ5L
>
different heads and manifolds. As I recall there's even differences in
different years of the "HO" heads.
JoBo
"Ervin Charles" <charleserv@charter.net> wrote in message
news:PKbIe.3223$c45.1774@fe05.lga...
> Hey guys,
> I've read Tim Weaver's excellent article on installing a 4.0 head on a
> 4.2 block ( http://monsterslayer.com/jeep/40Head/40Head.htm ) and am
> preparing to do the same to my 84 CJ7. I'm wondering if anyone in this
> group has swapped a factory Cherokee 4.0 fuel injection system into an
> earlier model vehicle. I know I'm going to need the wiring harness, the
> computer (ECM), as well as the manifold with the MAF, Temp sensor, TPS,
> etc., etc.. Other than installing an O2 sensor in the exhaust is there
> anything I'm overlooking? I will not be running a catalytic converter.
> This seems to be a pretty heads up swap and I really would like to avoid a
> $2,000.00 bill for a fuel injection system.
> While I'm at it I'll probably change the ignition to the later model
> computer controlled ignition.
> Any and all input is greatly appreciated.
> Thanks,
> Charles E.
> 84 CJ7
> 92 Cherokee
> 81 DJ5L
>
08-04-2005, 06:52 AM
#4
Guest
Posts: n/a
Re: 4.0 head on a 4.2 questions
Be advised the Cherokees have two totally different computer systems with
different heads and manifolds. As I recall there's even differences in
different years of the "HO" heads.
JoBo
"Ervin Charles" <charleserv@charter.net> wrote in message
news:PKbIe.3223$c45.1774@fe05.lga...
> Hey guys,
> I've read Tim Weaver's excellent article on installing a 4.0 head on a
> 4.2 block ( http://monsterslayer.com/jeep/40Head/40Head.htm ) and am
> preparing to do the same to my 84 CJ7. I'm wondering if anyone in this
> group has swapped a factory Cherokee 4.0 fuel injection system into an
> earlier model vehicle. I know I'm going to need the wiring harness, the
> computer (ECM), as well as the manifold with the MAF, Temp sensor, TPS,
> etc., etc.. Other than installing an O2 sensor in the exhaust is there
> anything I'm overlooking? I will not be running a catalytic converter.
> This seems to be a pretty heads up swap and I really would like to avoid a
> $2,000.00 bill for a fuel injection system.
> While I'm at it I'll probably change the ignition to the later model
> computer controlled ignition.
> Any and all input is greatly appreciated.
> Thanks,
> Charles E.
> 84 CJ7
> 92 Cherokee
> 81 DJ5L
>
different heads and manifolds. As I recall there's even differences in
different years of the "HO" heads.
JoBo
"Ervin Charles" <charleserv@charter.net> wrote in message
news:PKbIe.3223$c45.1774@fe05.lga...
> Hey guys,
> I've read Tim Weaver's excellent article on installing a 4.0 head on a
> 4.2 block ( http://monsterslayer.com/jeep/40Head/40Head.htm ) and am
> preparing to do the same to my 84 CJ7. I'm wondering if anyone in this
> group has swapped a factory Cherokee 4.0 fuel injection system into an
> earlier model vehicle. I know I'm going to need the wiring harness, the
> computer (ECM), as well as the manifold with the MAF, Temp sensor, TPS,
> etc., etc.. Other than installing an O2 sensor in the exhaust is there
> anything I'm overlooking? I will not be running a catalytic converter.
> This seems to be a pretty heads up swap and I really would like to avoid a
> $2,000.00 bill for a fuel injection system.
> While I'm at it I'll probably change the ignition to the later model
> computer controlled ignition.
> Any and all input is greatly appreciated.
> Thanks,
> Charles E.
> 84 CJ7
> 92 Cherokee
> 81 DJ5L
>
08-04-2005, 06:52 AM
#5
Guest
Posts: n/a
Re: 4.0 head on a 4.2 questions
Be advised the Cherokees have two totally different computer systems with
different heads and manifolds. As I recall there's even differences in
different years of the "HO" heads.
JoBo
"Ervin Charles" <charleserv@charter.net> wrote in message
news:PKbIe.3223$c45.1774@fe05.lga...
> Hey guys,
> I've read Tim Weaver's excellent article on installing a 4.0 head on a
> 4.2 block ( http://monsterslayer.com/jeep/40Head/40Head.htm ) and am
> preparing to do the same to my 84 CJ7. I'm wondering if anyone in this
> group has swapped a factory Cherokee 4.0 fuel injection system into an
> earlier model vehicle. I know I'm going to need the wiring harness, the
> computer (ECM), as well as the manifold with the MAF, Temp sensor, TPS,
> etc., etc.. Other than installing an O2 sensor in the exhaust is there
> anything I'm overlooking? I will not be running a catalytic converter.
> This seems to be a pretty heads up swap and I really would like to avoid a
> $2,000.00 bill for a fuel injection system.
> While I'm at it I'll probably change the ignition to the later model
> computer controlled ignition.
> Any and all input is greatly appreciated.
> Thanks,
> Charles E.
> 84 CJ7
> 92 Cherokee
> 81 DJ5L
>
different heads and manifolds. As I recall there's even differences in
different years of the "HO" heads.
JoBo
"Ervin Charles" <charleserv@charter.net> wrote in message
news:PKbIe.3223$c45.1774@fe05.lga...
> Hey guys,
> I've read Tim Weaver's excellent article on installing a 4.0 head on a
> 4.2 block ( http://monsterslayer.com/jeep/40Head/40Head.htm ) and am
> preparing to do the same to my 84 CJ7. I'm wondering if anyone in this
> group has swapped a factory Cherokee 4.0 fuel injection system into an
> earlier model vehicle. I know I'm going to need the wiring harness, the
> computer (ECM), as well as the manifold with the MAF, Temp sensor, TPS,
> etc., etc.. Other than installing an O2 sensor in the exhaust is there
> anything I'm overlooking? I will not be running a catalytic converter.
> This seems to be a pretty heads up swap and I really would like to avoid a
> $2,000.00 bill for a fuel injection system.
> While I'm at it I'll probably change the ignition to the later model
> computer controlled ignition.
> Any and all input is greatly appreciated.
> Thanks,
> Charles E.
> 84 CJ7
> 92 Cherokee
> 81 DJ5L
>
08-04-2005, 06:54 PM
#6
Guest
Posts: n/a
Re: 4.0 head on a 4.2 questions
JoBo,
If I am taking the head, manifold. computer and all components from the
same Cherokee wouldn't that remove the risk of mismatching components?
And Thanks for your response, I thought with all these jeep guys, more would
have chimed in.
Charles
"Jo Bo" <jromasSPAM@columbus.rr.com> wrote in message
news:JrmIe.61983$yC5.38078@tornado.ohiordc.rr.com. ..
> Be advised the Cherokees have two totally different computer systems with
> different heads and manifolds. As I recall there's even differences in
> different years of the "HO" heads.
>
> JoBo
>
> "Ervin Charles" <charleserv@charter.net> wrote in message
> news:PKbIe.3223$c45.1774@fe05.lga...
>> Hey guys,
>> I've read Tim Weaver's excellent article on installing a 4.0 head on a
>> 4.2 block ( http://monsterslayer.com/jeep/40Head/40Head.htm ) and am
>> preparing to do the same to my 84 CJ7. I'm wondering if anyone in this
>> group has swapped a factory Cherokee 4.0 fuel injection system into an
>> earlier model vehicle. I know I'm going to need the wiring harness, the
>> computer (ECM), as well as the manifold with the MAF, Temp sensor, TPS,
>> etc., etc.. Other than installing an O2 sensor in the exhaust is there
>> anything I'm overlooking? I will not be running a catalytic converter.
>> This seems to be a pretty heads up swap and I really would like to avoid
>> a $2,000.00 bill for a fuel injection system.
>> While I'm at it I'll probably change the ignition to the later model
>> computer controlled ignition.
>> Any and all input is greatly appreciated.
>> Thanks,
>> Charles E.
>> 84 CJ7
>> 92 Cherokee
>> 81 DJ5L
>>
>
>
If I am taking the head, manifold. computer and all components from the
same Cherokee wouldn't that remove the risk of mismatching components?
And Thanks for your response, I thought with all these jeep guys, more would
have chimed in.
Charles
"Jo Bo" <jromasSPAM@columbus.rr.com> wrote in message
news:JrmIe.61983$yC5.38078@tornado.ohiordc.rr.com. ..
> Be advised the Cherokees have two totally different computer systems with
> different heads and manifolds. As I recall there's even differences in
> different years of the "HO" heads.
>
> JoBo
>
> "Ervin Charles" <charleserv@charter.net> wrote in message
> news:PKbIe.3223$c45.1774@fe05.lga...
>> Hey guys,
>> I've read Tim Weaver's excellent article on installing a 4.0 head on a
>> 4.2 block ( http://monsterslayer.com/jeep/40Head/40Head.htm ) and am
>> preparing to do the same to my 84 CJ7. I'm wondering if anyone in this
>> group has swapped a factory Cherokee 4.0 fuel injection system into an
>> earlier model vehicle. I know I'm going to need the wiring harness, the
>> computer (ECM), as well as the manifold with the MAF, Temp sensor, TPS,
>> etc., etc.. Other than installing an O2 sensor in the exhaust is there
>> anything I'm overlooking? I will not be running a catalytic converter.
>> This seems to be a pretty heads up swap and I really would like to avoid
>> a $2,000.00 bill for a fuel injection system.
>> While I'm at it I'll probably change the ignition to the later model
>> computer controlled ignition.
>> Any and all input is greatly appreciated.
>> Thanks,
>> Charles E.
>> 84 CJ7
>> 92 Cherokee
>> 81 DJ5L
>>
>
>
08-04-2005, 06:54 PM
#7
Guest
Posts: n/a
Re: 4.0 head on a 4.2 questions
JoBo,
If I am taking the head, manifold. computer and all components from the
same Cherokee wouldn't that remove the risk of mismatching components?
And Thanks for your response, I thought with all these jeep guys, more would
have chimed in.
Charles
"Jo Bo" <jromasSPAM@columbus.rr.com> wrote in message
news:JrmIe.61983$yC5.38078@tornado.ohiordc.rr.com. ..
> Be advised the Cherokees have two totally different computer systems with
> different heads and manifolds. As I recall there's even differences in
> different years of the "HO" heads.
>
> JoBo
>
> "Ervin Charles" <charleserv@charter.net> wrote in message
> news:PKbIe.3223$c45.1774@fe05.lga...
>> Hey guys,
>> I've read Tim Weaver's excellent article on installing a 4.0 head on a
>> 4.2 block ( http://monsterslayer.com/jeep/40Head/40Head.htm ) and am
>> preparing to do the same to my 84 CJ7. I'm wondering if anyone in this
>> group has swapped a factory Cherokee 4.0 fuel injection system into an
>> earlier model vehicle. I know I'm going to need the wiring harness, the
>> computer (ECM), as well as the manifold with the MAF, Temp sensor, TPS,
>> etc., etc.. Other than installing an O2 sensor in the exhaust is there
>> anything I'm overlooking? I will not be running a catalytic converter.
>> This seems to be a pretty heads up swap and I really would like to avoid
>> a $2,000.00 bill for a fuel injection system.
>> While I'm at it I'll probably change the ignition to the later model
>> computer controlled ignition.
>> Any and all input is greatly appreciated.
>> Thanks,
>> Charles E.
>> 84 CJ7
>> 92 Cherokee
>> 81 DJ5L
>>
>
>
If I am taking the head, manifold. computer and all components from the
same Cherokee wouldn't that remove the risk of mismatching components?
And Thanks for your response, I thought with all these jeep guys, more would
have chimed in.
Charles
"Jo Bo" <jromasSPAM@columbus.rr.com> wrote in message
news:JrmIe.61983$yC5.38078@tornado.ohiordc.rr.com. ..
> Be advised the Cherokees have two totally different computer systems with
> different heads and manifolds. As I recall there's even differences in
> different years of the "HO" heads.
>
> JoBo
>
> "Ervin Charles" <charleserv@charter.net> wrote in message
> news:PKbIe.3223$c45.1774@fe05.lga...
>> Hey guys,
>> I've read Tim Weaver's excellent article on installing a 4.0 head on a
>> 4.2 block ( http://monsterslayer.com/jeep/40Head/40Head.htm ) and am
>> preparing to do the same to my 84 CJ7. I'm wondering if anyone in this
>> group has swapped a factory Cherokee 4.0 fuel injection system into an
>> earlier model vehicle. I know I'm going to need the wiring harness, the
>> computer (ECM), as well as the manifold with the MAF, Temp sensor, TPS,
>> etc., etc.. Other than installing an O2 sensor in the exhaust is there
>> anything I'm overlooking? I will not be running a catalytic converter.
>> This seems to be a pretty heads up swap and I really would like to avoid
>> a $2,000.00 bill for a fuel injection system.
>> While I'm at it I'll probably change the ignition to the later model
>> computer controlled ignition.
>> Any and all input is greatly appreciated.
>> Thanks,
>> Charles E.
>> 84 CJ7
>> 92 Cherokee
>> 81 DJ5L
>>
>
>
08-04-2005, 06:54 PM
#8
Guest
Posts: n/a
Re: 4.0 head on a 4.2 questions
JoBo,
If I am taking the head, manifold. computer and all components from the
same Cherokee wouldn't that remove the risk of mismatching components?
And Thanks for your response, I thought with all these jeep guys, more would
have chimed in.
Charles
"Jo Bo" <jromasSPAM@columbus.rr.com> wrote in message
news:JrmIe.61983$yC5.38078@tornado.ohiordc.rr.com. ..
> Be advised the Cherokees have two totally different computer systems with
> different heads and manifolds. As I recall there's even differences in
> different years of the "HO" heads.
>
> JoBo
>
> "Ervin Charles" <charleserv@charter.net> wrote in message
> news:PKbIe.3223$c45.1774@fe05.lga...
>> Hey guys,
>> I've read Tim Weaver's excellent article on installing a 4.0 head on a
>> 4.2 block ( http://monsterslayer.com/jeep/40Head/40Head.htm ) and am
>> preparing to do the same to my 84 CJ7. I'm wondering if anyone in this
>> group has swapped a factory Cherokee 4.0 fuel injection system into an
>> earlier model vehicle. I know I'm going to need the wiring harness, the
>> computer (ECM), as well as the manifold with the MAF, Temp sensor, TPS,
>> etc., etc.. Other than installing an O2 sensor in the exhaust is there
>> anything I'm overlooking? I will not be running a catalytic converter.
>> This seems to be a pretty heads up swap and I really would like to avoid
>> a $2,000.00 bill for a fuel injection system.
>> While I'm at it I'll probably change the ignition to the later model
>> computer controlled ignition.
>> Any and all input is greatly appreciated.
>> Thanks,
>> Charles E.
>> 84 CJ7
>> 92 Cherokee
>> 81 DJ5L
>>
>
>
If I am taking the head, manifold. computer and all components from the
same Cherokee wouldn't that remove the risk of mismatching components?
And Thanks for your response, I thought with all these jeep guys, more would
have chimed in.
Charles
"Jo Bo" <jromasSPAM@columbus.rr.com> wrote in message
news:JrmIe.61983$yC5.38078@tornado.ohiordc.rr.com. ..
> Be advised the Cherokees have two totally different computer systems with
> different heads and manifolds. As I recall there's even differences in
> different years of the "HO" heads.
>
> JoBo
>
> "Ervin Charles" <charleserv@charter.net> wrote in message
> news:PKbIe.3223$c45.1774@fe05.lga...
>> Hey guys,
>> I've read Tim Weaver's excellent article on installing a 4.0 head on a
>> 4.2 block ( http://monsterslayer.com/jeep/40Head/40Head.htm ) and am
>> preparing to do the same to my 84 CJ7. I'm wondering if anyone in this
>> group has swapped a factory Cherokee 4.0 fuel injection system into an
>> earlier model vehicle. I know I'm going to need the wiring harness, the
>> computer (ECM), as well as the manifold with the MAF, Temp sensor, TPS,
>> etc., etc.. Other than installing an O2 sensor in the exhaust is there
>> anything I'm overlooking? I will not be running a catalytic converter.
>> This seems to be a pretty heads up swap and I really would like to avoid
>> a $2,000.00 bill for a fuel injection system.
>> While I'm at it I'll probably change the ignition to the later model
>> computer controlled ignition.
>> Any and all input is greatly appreciated.
>> Thanks,
>> Charles E.
>> 84 CJ7
>> 92 Cherokee
>> 81 DJ5L
>>
>
>
08-04-2005, 06:54 PM
#9
Guest
Posts: n/a
Re: 4.0 head on a 4.2 questions
JoBo,
If I am taking the head, manifold. computer and all components from the
same Cherokee wouldn't that remove the risk of mismatching components?
And Thanks for your response, I thought with all these jeep guys, more would
have chimed in.
Charles
"Jo Bo" <jromasSPAM@columbus.rr.com> wrote in message
news:JrmIe.61983$yC5.38078@tornado.ohiordc.rr.com. ..
> Be advised the Cherokees have two totally different computer systems with
> different heads and manifolds. As I recall there's even differences in
> different years of the "HO" heads.
>
> JoBo
>
> "Ervin Charles" <charleserv@charter.net> wrote in message
> news:PKbIe.3223$c45.1774@fe05.lga...
>> Hey guys,
>> I've read Tim Weaver's excellent article on installing a 4.0 head on a
>> 4.2 block ( http://monsterslayer.com/jeep/40Head/40Head.htm ) and am
>> preparing to do the same to my 84 CJ7. I'm wondering if anyone in this
>> group has swapped a factory Cherokee 4.0 fuel injection system into an
>> earlier model vehicle. I know I'm going to need the wiring harness, the
>> computer (ECM), as well as the manifold with the MAF, Temp sensor, TPS,
>> etc., etc.. Other than installing an O2 sensor in the exhaust is there
>> anything I'm overlooking? I will not be running a catalytic converter.
>> This seems to be a pretty heads up swap and I really would like to avoid
>> a $2,000.00 bill for a fuel injection system.
>> While I'm at it I'll probably change the ignition to the later model
>> computer controlled ignition.
>> Any and all input is greatly appreciated.
>> Thanks,
>> Charles E.
>> 84 CJ7
>> 92 Cherokee
>> 81 DJ5L
>>
>
>
If I am taking the head, manifold. computer and all components from the
same Cherokee wouldn't that remove the risk of mismatching components?
And Thanks for your response, I thought with all these jeep guys, more would
have chimed in.
Charles
"Jo Bo" <jromasSPAM@columbus.rr.com> wrote in message
news:JrmIe.61983$yC5.38078@tornado.ohiordc.rr.com. ..
> Be advised the Cherokees have two totally different computer systems with
> different heads and manifolds. As I recall there's even differences in
> different years of the "HO" heads.
>
> JoBo
>
> "Ervin Charles" <charleserv@charter.net> wrote in message
> news:PKbIe.3223$c45.1774@fe05.lga...
>> Hey guys,
>> I've read Tim Weaver's excellent article on installing a 4.0 head on a
>> 4.2 block ( http://monsterslayer.com/jeep/40Head/40Head.htm ) and am
>> preparing to do the same to my 84 CJ7. I'm wondering if anyone in this
>> group has swapped a factory Cherokee 4.0 fuel injection system into an
>> earlier model vehicle. I know I'm going to need the wiring harness, the
>> computer (ECM), as well as the manifold with the MAF, Temp sensor, TPS,
>> etc., etc.. Other than installing an O2 sensor in the exhaust is there
>> anything I'm overlooking? I will not be running a catalytic converter.
>> This seems to be a pretty heads up swap and I really would like to avoid
>> a $2,000.00 bill for a fuel injection system.
>> While I'm at it I'll probably change the ignition to the later model
>> computer controlled ignition.
>> Any and all input is greatly appreciated.
>> Thanks,
>> Charles E.
>> 84 CJ7
>> 92 Cherokee
>> 81 DJ5L
>>
>
>
08-04-2005, 07:10 PM
#10
Guest
Posts: n/a
Re: 4.0 head on a 4.2 questions
Well.... it is a shaky conversion. You have to rely on glue or JB Weld
to seal up big voids in the water jacket....
Not for me thanks.
And yes, if you get everything from one donor vehicle, you shouldn't
have issues.
The problem is all the folks that do the FI conversion only boast about
a 25% boost in power with a drop in gas mileage. Well you get that for
free by just killing the computer via a Nutter bypass and as a bonus,
you get an 'increase' in gas mileage.....
All the 4.0's that wheel with me and my BBD 'nuttered' carb engine burn
a lot more gas than me on the same trails....
I always get a nice 23 mpg loaded on the highway and my CJ7 goes like a
scalded cat. It will spin up my 33's too easy in first with 3.31 gears
even, 2nd hits 50+ mph at 4400 rpm, 3rd pulls fast to 75 mph, 4 buries
the speedo and I have 'no' freakin' urge to find out how fast 5th
goes....
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Ervin Charles wrote:
>
> JoBo,
> If I am taking the head, manifold. computer and all components from the
> same Cherokee wouldn't that remove the risk of mismatching components?
> And Thanks for your response, I thought with all these jeep guys, more would
> have chimed in.
> Charles
> "Jo Bo" <jromasSPAM@columbus.rr.com> wrote in message
> news:JrmIe.61983$yC5.38078@tornado.ohiordc.rr.com. ..
> > Be advised the Cherokees have two totally different computer systems with
> > different heads and manifolds. As I recall there's even differences in
> > different years of the "HO" heads.
> >
> > JoBo
> >
> > "Ervin Charles" <charleserv@charter.net> wrote in message
> > news:PKbIe.3223$c45.1774@fe05.lga...
> >> Hey guys,
> >> I've read Tim Weaver's excellent article on installing a 4.0 head on a
> >> 4.2 block ( http://monsterslayer.com/jeep/40Head/40Head.htm ) and am
> >> preparing to do the same to my 84 CJ7. I'm wondering if anyone in this
> >> group has swapped a factory Cherokee 4.0 fuel injection system into an
> >> earlier model vehicle. I know I'm going to need the wiring harness, the
> >> computer (ECM), as well as the manifold with the MAF, Temp sensor, TPS,
> >> etc., etc.. Other than installing an O2 sensor in the exhaust is there
> >> anything I'm overlooking? I will not be running a catalytic converter.
> >> This seems to be a pretty heads up swap and I really would like to avoid
> >> a $2,000.00 bill for a fuel injection system.
> >> While I'm at it I'll probably change the ignition to the later model
> >> computer controlled ignition.
> >> Any and all input is greatly appreciated.
> >> Thanks,
> >> Charles E.
> >> 84 CJ7
> >> 92 Cherokee
> >> 81 DJ5L
> >>
> >
> >
to seal up big voids in the water jacket....
Not for me thanks.
And yes, if you get everything from one donor vehicle, you shouldn't
have issues.
The problem is all the folks that do the FI conversion only boast about
a 25% boost in power with a drop in gas mileage. Well you get that for
free by just killing the computer via a Nutter bypass and as a bonus,
you get an 'increase' in gas mileage.....
All the 4.0's that wheel with me and my BBD 'nuttered' carb engine burn
a lot more gas than me on the same trails....
I always get a nice 23 mpg loaded on the highway and my CJ7 goes like a
scalded cat. It will spin up my 33's too easy in first with 3.31 gears
even, 2nd hits 50+ mph at 4400 rpm, 3rd pulls fast to 75 mph, 4 buries
the speedo and I have 'no' freakin' urge to find out how fast 5th
goes....
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Ervin Charles wrote:
>
> JoBo,
> If I am taking the head, manifold. computer and all components from the
> same Cherokee wouldn't that remove the risk of mismatching components?
> And Thanks for your response, I thought with all these jeep guys, more would
> have chimed in.
> Charles
> "Jo Bo" <jromasSPAM@columbus.rr.com> wrote in message
> news:JrmIe.61983$yC5.38078@tornado.ohiordc.rr.com. ..
> > Be advised the Cherokees have two totally different computer systems with
> > different heads and manifolds. As I recall there's even differences in
> > different years of the "HO" heads.
> >
> > JoBo
> >
> > "Ervin Charles" <charleserv@charter.net> wrote in message
> > news:PKbIe.3223$c45.1774@fe05.lga...
> >> Hey guys,
> >> I've read Tim Weaver's excellent article on installing a 4.0 head on a
> >> 4.2 block ( http://monsterslayer.com/jeep/40Head/40Head.htm ) and am
> >> preparing to do the same to my 84 CJ7. I'm wondering if anyone in this
> >> group has swapped a factory Cherokee 4.0 fuel injection system into an
> >> earlier model vehicle. I know I'm going to need the wiring harness, the
> >> computer (ECM), as well as the manifold with the MAF, Temp sensor, TPS,
> >> etc., etc.. Other than installing an O2 sensor in the exhaust is there
> >> anything I'm overlooking? I will not be running a catalytic converter.
> >> This seems to be a pretty heads up swap and I really would like to avoid
> >> a $2,000.00 bill for a fuel injection system.
> >> While I'm at it I'll probably change the ignition to the later model
> >> computer controlled ignition.
> >> Any and all input is greatly appreciated.
> >> Thanks,
> >> Charles E.
> >> 84 CJ7
> >> 92 Cherokee
> >> 81 DJ5L
> >>
> >
> >