Re: New Cam, Jeep will only run without TPS
 

you need to get the timming gears straight up on the marks before doing the
timing resync

DougW wrote:

> jeepinacreek wrote:
> > I tried you idea of reseting the PCM and turning the key and not
> > starting and turning the throttle body. Didn't work. This time the was
> > a lot of backfiring at very low RPM's and front firing at high RPMS?
> > Any suggestions?
>
> backfire indicates late ignition timing or excessive fuel.
> frontfire (odd term, assume you mean fire out the throttle body)
> indicates ignition on the intake stroke before the valve has closed
> or possibly a lean condition.
>
> The only things I can think of is your timing is way off or the plug
> wires are crossed... Timing could be the distributor or the chain.
>
> waitadarnsec.......
>
> Just a thought, but have you made sure all the injector wires got back
> on the correct injector? IIRC there are two of them that can be easily
> switched up. That would sure get the fuel delivered at the wrong time
> and cause lean/rich conditions.
>
> As for the timing issue.
> Kind of reminds me of this article, but your engine runs.
> http://www.asashop.org/autoinc/feb99/techtotech.htm
>
> --
> DougW

Re: New Cam, Jeep will only run without TPS
 

you need to get the timming gears straight up on the marks before doing the
timing resync

DougW wrote:

> jeepinacreek wrote:
> > I tried you idea of reseting the PCM and turning the key and not
> > starting and turning the throttle body. Didn't work. This time the was
> > a lot of backfiring at very low RPM's and front firing at high RPMS?
> > Any suggestions?
>
> backfire indicates late ignition timing or excessive fuel.
> frontfire (odd term, assume you mean fire out the throttle body)
> indicates ignition on the intake stroke before the valve has closed
> or possibly a lean condition.
>
> The only things I can think of is your timing is way off or the plug
> wires are crossed... Timing could be the distributor or the chain.
>
> waitadarnsec.......
>
> Just a thought, but have you made sure all the injector wires got back
> on the correct injector? IIRC there are two of them that can be easily
> switched up. That would sure get the fuel delivered at the wrong time
> and cause lean/rich conditions.
>
> As for the timing issue.
> Kind of reminds me of this article, but your engine runs.
> http://www.asashop.org/autoinc/feb99/techtotech.htm
>
> --
> DougW

Re: New Cam, Jeep will only run without TPS
 

Hmm..... Could the cam gear be off 180?

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

jeepinacreek wrote:
>
> I haven't put the timing gear back to TDC on the timing marks. Its suck
> a pain in the ass with the motor installed and 16 bucks for a gasket.
> I've done it three times now, the little things have been adding up for
> a while. Anyway, I tried to put the dist past the no.1 post. It has
> always lined up on the post or to far ahead of the post and doesn't
> start or runs real rough.
>
> philthy wrote:
> > you have to set the timing gears bac to straight up and then you have to
> > properly resync the dist(.need factory manual for procedure) and get the dist
> > rotor past #1 cylinder tower of the dist.cap to get it in the correct place
> > even if it means spinning oil pump drive a hair and it should drop in
> >
> > "L.W.(Bill) ------ III" wrote:
> >
> > > I am a total loss as to how it would run without the Crankshaft
> > > Position Sensor. It should default into the safe mode, with no spark
> > > advance. Maybe you have your distributor installed in such a way so that
> > > it's Cam Position Sensor somehow takes over??????? What's the timing
> > > light show, initial and total?
> > > God Bless America, Bill O|||||||O
> > > mailto:-------------------- http://www.----------.com/
> > >
> > > jeepinacreek wrote:
> > > >
> > > > I recently put a new cam in my 1997 Jeep Wrangler 4.0L. I figured it
> > > > was a great mod with out totaly stroking the motor. After completing
> > > > the buildup and starting it for the first time, I thought great it
> > > > runs. Then I ran up and it starting backfiring at around 1800+ RPM.
> > > > This has been my battle for the last three months.
> > > >
> > > > A little about my Jeep;
> > > > Doug thorley header
> > > > bored out 62mm throttle
> > > > MSD ignition
> > > > New catalatic convertor, Flowmaster 50 exhaust Cold air intake 4in
> > > > Curry Enterpise lift 33in tires, 4:10 gears, lockers
> > > >
> > > > What I have done to fix this so far;
> > > > -Took it the dealer, they wouldn't touch it.
> > > > -I currently have timing chain retarded -5 degree's due to pinging, cut
> > > > down on backfiring.
> > > > -I also had it advanced +5 degree's, caused a lot more backfiring.
> > > > -I also ran the cam at TDC with no advance or timing. This is the
> > > > original way I built it.
> > > > -Changed TPS
> > > > -Changed spark plugs, wires, cap, rotor, and coil. Currently run MSD
> > > > ignition which I disconnected and the Jeep barely ran. Connected it
> > > > back up and seems to be the only thing keeping it running. So I know
> > > > the MSD works -changed O2 sensors -changed fuel pump and filters in
> > > > tank, gas cap to.
> > > > -Changed fuel injecters to 21LB injectors, stock is around 23.5LB -Put
> > > > an air/fuel ratio gauge on it.
> > > >
> > > > So my latest attempt to get this thing running right truely has me
> > > > scratching my head, I left the TPS wire connected disconnected, drove
> > > > it and it runs fine. No backfire at 1800+ RPM, it doesn't surge,
> > > > hesitate or ping or miss or run rich. It runs great, I can drive it on
> > > > the freeway now.
> > > >
> > > > I am on my last leg with this thing. Anyone have any ideas or
> > > > suggestions?????? Please help or i may put the stock cam back in.

Re: New Cam, Jeep will only run without TPS
 

Hmm..... Could the cam gear be off 180?

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

jeepinacreek wrote:
>
> I haven't put the timing gear back to TDC on the timing marks. Its suck
> a pain in the ass with the motor installed and 16 bucks for a gasket.
> I've done it three times now, the little things have been adding up for
> a while. Anyway, I tried to put the dist past the no.1 post. It has
> always lined up on the post or to far ahead of the post and doesn't
> start or runs real rough.
>
> philthy wrote:
> > you have to set the timing gears bac to straight up and then you have to
> > properly resync the dist(.need factory manual for procedure) and get the dist
> > rotor past #1 cylinder tower of the dist.cap to get it in the correct place
> > even if it means spinning oil pump drive a hair and it should drop in
> >
> > "L.W.(Bill) ------ III" wrote:
> >
> > > I am a total loss as to how it would run without the Crankshaft
> > > Position Sensor. It should default into the safe mode, with no spark
> > > advance. Maybe you have your distributor installed in such a way so that
> > > it's Cam Position Sensor somehow takes over??????? What's the timing
> > > light show, initial and total?
> > > God Bless America, Bill O|||||||O
> > > mailto:-------------------- http://www.----------.com/
> > >
> > > jeepinacreek wrote:
> > > >
> > > > I recently put a new cam in my 1997 Jeep Wrangler 4.0L. I figured it
> > > > was a great mod with out totaly stroking the motor. After completing
> > > > the buildup and starting it for the first time, I thought great it
> > > > runs. Then I ran up and it starting backfiring at around 1800+ RPM.
> > > > This has been my battle for the last three months.
> > > >
> > > > A little about my Jeep;
> > > > Doug thorley header
> > > > bored out 62mm throttle
> > > > MSD ignition
> > > > New catalatic convertor, Flowmaster 50 exhaust Cold air intake 4in
> > > > Curry Enterpise lift 33in tires, 4:10 gears, lockers
> > > >
> > > > What I have done to fix this so far;
> > > > -Took it the dealer, they wouldn't touch it.
> > > > -I currently have timing chain retarded -5 degree's due to pinging, cut
> > > > down on backfiring.
> > > > -I also had it advanced +5 degree's, caused a lot more backfiring.
> > > > -I also ran the cam at TDC with no advance or timing. This is the
> > > > original way I built it.
> > > > -Changed TPS
> > > > -Changed spark plugs, wires, cap, rotor, and coil. Currently run MSD
> > > > ignition which I disconnected and the Jeep barely ran. Connected it
> > > > back up and seems to be the only thing keeping it running. So I know
> > > > the MSD works -changed O2 sensors -changed fuel pump and filters in
> > > > tank, gas cap to.
> > > > -Changed fuel injecters to 21LB injectors, stock is around 23.5LB -Put
> > > > an air/fuel ratio gauge on it.
> > > >
> > > > So my latest attempt to get this thing running right truely has me
> > > > scratching my head, I left the TPS wire connected disconnected, drove
> > > > it and it runs fine. No backfire at 1800+ RPM, it doesn't surge,
> > > > hesitate or ping or miss or run rich. It runs great, I can drive it on
> > > > the freeway now.
> > > >
> > > > I am on my last leg with this thing. Anyone have any ideas or
> > > > suggestions?????? Please help or i may put the stock cam back in.

Re: New Cam, Jeep will only run without TPS
 

Hmm..... Could the cam gear be off 180?

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

jeepinacreek wrote:
>
> I haven't put the timing gear back to TDC on the timing marks. Its suck
> a pain in the ass with the motor installed and 16 bucks for a gasket.
> I've done it three times now, the little things have been adding up for
> a while. Anyway, I tried to put the dist past the no.1 post. It has
> always lined up on the post or to far ahead of the post and doesn't
> start or runs real rough.
>
> philthy wrote:
> > you have to set the timing gears bac to straight up and then you have to
> > properly resync the dist(.need factory manual for procedure) and get the dist
> > rotor past #1 cylinder tower of the dist.cap to get it in the correct place
> > even if it means spinning oil pump drive a hair and it should drop in
> >
> > "L.W.(Bill) ------ III" wrote:
> >
> > > I am a total loss as to how it would run without the Crankshaft
> > > Position Sensor. It should default into the safe mode, with no spark
> > > advance. Maybe you have your distributor installed in such a way so that
> > > it's Cam Position Sensor somehow takes over??????? What's the timing
> > > light show, initial and total?
> > > God Bless America, Bill O|||||||O
> > > mailto:-------------------- http://www.----------.com/
> > >
> > > jeepinacreek wrote:
> > > >
> > > > I recently put a new cam in my 1997 Jeep Wrangler 4.0L. I figured it
> > > > was a great mod with out totaly stroking the motor. After completing
> > > > the buildup and starting it for the first time, I thought great it
> > > > runs. Then I ran up and it starting backfiring at around 1800+ RPM.
> > > > This has been my battle for the last three months.
> > > >
> > > > A little about my Jeep;
> > > > Doug thorley header
> > > > bored out 62mm throttle
> > > > MSD ignition
> > > > New catalatic convertor, Flowmaster 50 exhaust Cold air intake 4in
> > > > Curry Enterpise lift 33in tires, 4:10 gears, lockers
> > > >
> > > > What I have done to fix this so far;
> > > > -Took it the dealer, they wouldn't touch it.
> > > > -I currently have timing chain retarded -5 degree's due to pinging, cut
> > > > down on backfiring.
> > > > -I also had it advanced +5 degree's, caused a lot more backfiring.
> > > > -I also ran the cam at TDC with no advance or timing. This is the
> > > > original way I built it.
> > > > -Changed TPS
> > > > -Changed spark plugs, wires, cap, rotor, and coil. Currently run MSD
> > > > ignition which I disconnected and the Jeep barely ran. Connected it
> > > > back up and seems to be the only thing keeping it running. So I know
> > > > the MSD works -changed O2 sensors -changed fuel pump and filters in
> > > > tank, gas cap to.
> > > > -Changed fuel injecters to 21LB injectors, stock is around 23.5LB -Put
> > > > an air/fuel ratio gauge on it.
> > > >
> > > > So my latest attempt to get this thing running right truely has me
> > > > scratching my head, I left the TPS wire connected disconnected, drove
> > > > it and it runs fine. No backfire at 1800+ RPM, it doesn't surge,
> > > > hesitate or ping or miss or run rich. It runs great, I can drive it on
> > > > the freeway now.
> > > >
> > > > I am on my last leg with this thing. Anyone have any ideas or
> > > > suggestions?????? Please help or i may put the stock cam back in.