Help with 258 Mopar FI
04-26-2004, 12:42 PM
#1
Guest
Posts: n/a
Help with 258 Mopar FI
Thanks again for the welcome back. I'm having some problems with my MOPAR
fuel injection on my 258. It runs great once it's warmed up but upon first
start in the morning it runs like crap. (not sure how crap really runs but
its the best familyish word I can come up with right now.)
As long as I keep my foot in it its ok but if I just fire up the engine and
don't use the skinny pedal, it sputters and dies at least once. I can't find
any vacuum leaks. I checked by spraying WD on all connections including
manifolds. I'm running 92 octane as recomended by MOPAR. The engine was
rebuilt recently (before deployment) with basically all new guts. It's done
this since the install/rebuild. Any takers on what could be the problem?
Thanks in advance for the advice..
Rich Harris
86CJ7: Mopar MPFI, Detroit locker, 31 BFG AT's(for now) 1" body lift, Got
money left over from deployment and it's going into gears, a front locker,
Rubicon Express 2-1/2" YJ springs, one piece axles, and 33" BFG MT's. LIFE
IS GOOD!
fuel injection on my 258. It runs great once it's warmed up but upon first
start in the morning it runs like crap. (not sure how crap really runs but
its the best familyish word I can come up with right now.)
As long as I keep my foot in it its ok but if I just fire up the engine and
don't use the skinny pedal, it sputters and dies at least once. I can't find
any vacuum leaks. I checked by spraying WD on all connections including
manifolds. I'm running 92 octane as recomended by MOPAR. The engine was
rebuilt recently (before deployment) with basically all new guts. It's done
this since the install/rebuild. Any takers on what could be the problem?
Thanks in advance for the advice..
Rich Harris
86CJ7: Mopar MPFI, Detroit locker, 31 BFG AT's(for now) 1" body lift, Got
money left over from deployment and it's going into gears, a front locker,
Rubicon Express 2-1/2" YJ springs, one piece axles, and 33" BFG MT's. LIFE
IS GOOD!
04-26-2004, 01:02 PM
#2
Guest
Posts: n/a
Re: Help with 258 Mopar FI
Isn't this just about standard running procedures with the MPI Kit? Mine
also does it and I've read a lot of others have it. I either try to toe tap
it through the warm up or just let it die the first time and after that it's
all right.
I have heard a sound like sucking on a straw up to a certian point when
starting and after that no which leads me to believe it's some kind of
vacuum problem. But I have never figured it out, yet.
You could call Hesco and ask them. Maybe they've come up with something by
now.
Bill
"Richard Harris" <SHARRIS11nospam@san.rr.com> wrote in message
news:RZajc.8989$IO6.1804@twister.socal.rr.com...
> Thanks again for the welcome back. I'm having some problems with my MOPAR
> fuel injection on my 258. It runs great once it's warmed up but upon first
> start in the morning it runs like crap. (not sure how crap really runs but
> its the best familyish word I can come up with right now.)
> As long as I keep my foot in it its ok but if I just fire up the engine
and
> don't use the skinny pedal, it sputters and dies at least once. I can't
find
> any vacuum leaks. I checked by spraying WD on all connections including
> manifolds. I'm running 92 octane as recomended by MOPAR. The engine was
> rebuilt recently (before deployment) with basically all new guts. It's
done
> this since the install/rebuild. Any takers on what could be the problem?
> Thanks in advance for the advice..
> Rich Harris
> 86CJ7: Mopar MPFI, Detroit locker, 31 BFG AT's(for now) 1" body lift, Got
> money left over from deployment and it's going into gears, a front locker,
> Rubicon Express 2-1/2" YJ springs, one piece axles, and 33" BFG MT's. LIFE
> IS GOOD!
>
>
also does it and I've read a lot of others have it. I either try to toe tap
it through the warm up or just let it die the first time and after that it's
all right.
I have heard a sound like sucking on a straw up to a certian point when
starting and after that no which leads me to believe it's some kind of
vacuum problem. But I have never figured it out, yet.
You could call Hesco and ask them. Maybe they've come up with something by
now.
Bill
"Richard Harris" <SHARRIS11nospam@san.rr.com> wrote in message
news:RZajc.8989$IO6.1804@twister.socal.rr.com...
> Thanks again for the welcome back. I'm having some problems with my MOPAR
> fuel injection on my 258. It runs great once it's warmed up but upon first
> start in the morning it runs like crap. (not sure how crap really runs but
> its the best familyish word I can come up with right now.)
> As long as I keep my foot in it its ok but if I just fire up the engine
and
> don't use the skinny pedal, it sputters and dies at least once. I can't
find
> any vacuum leaks. I checked by spraying WD on all connections including
> manifolds. I'm running 92 octane as recomended by MOPAR. The engine was
> rebuilt recently (before deployment) with basically all new guts. It's
done
> this since the install/rebuild. Any takers on what could be the problem?
> Thanks in advance for the advice..
> Rich Harris
> 86CJ7: Mopar MPFI, Detroit locker, 31 BFG AT's(for now) 1" body lift, Got
> money left over from deployment and it's going into gears, a front locker,
> Rubicon Express 2-1/2" YJ springs, one piece axles, and 33" BFG MT's. LIFE
> IS GOOD!
>
>
04-26-2004, 01:02 PM
#3
Guest
Posts: n/a
Re: Help with 258 Mopar FI
Isn't this just about standard running procedures with the MPI Kit? Mine
also does it and I've read a lot of others have it. I either try to toe tap
it through the warm up or just let it die the first time and after that it's
all right.
I have heard a sound like sucking on a straw up to a certian point when
starting and after that no which leads me to believe it's some kind of
vacuum problem. But I have never figured it out, yet.
You could call Hesco and ask them. Maybe they've come up with something by
now.
Bill
"Richard Harris" <SHARRIS11nospam@san.rr.com> wrote in message
news:RZajc.8989$IO6.1804@twister.socal.rr.com...
> Thanks again for the welcome back. I'm having some problems with my MOPAR
> fuel injection on my 258. It runs great once it's warmed up but upon first
> start in the morning it runs like crap. (not sure how crap really runs but
> its the best familyish word I can come up with right now.)
> As long as I keep my foot in it its ok but if I just fire up the engine
and
> don't use the skinny pedal, it sputters and dies at least once. I can't
find
> any vacuum leaks. I checked by spraying WD on all connections including
> manifolds. I'm running 92 octane as recomended by MOPAR. The engine was
> rebuilt recently (before deployment) with basically all new guts. It's
done
> this since the install/rebuild. Any takers on what could be the problem?
> Thanks in advance for the advice..
> Rich Harris
> 86CJ7: Mopar MPFI, Detroit locker, 31 BFG AT's(for now) 1" body lift, Got
> money left over from deployment and it's going into gears, a front locker,
> Rubicon Express 2-1/2" YJ springs, one piece axles, and 33" BFG MT's. LIFE
> IS GOOD!
>
>
also does it and I've read a lot of others have it. I either try to toe tap
it through the warm up or just let it die the first time and after that it's
all right.
I have heard a sound like sucking on a straw up to a certian point when
starting and after that no which leads me to believe it's some kind of
vacuum problem. But I have never figured it out, yet.
You could call Hesco and ask them. Maybe they've come up with something by
now.
Bill
"Richard Harris" <SHARRIS11nospam@san.rr.com> wrote in message
news:RZajc.8989$IO6.1804@twister.socal.rr.com...
> Thanks again for the welcome back. I'm having some problems with my MOPAR
> fuel injection on my 258. It runs great once it's warmed up but upon first
> start in the morning it runs like crap. (not sure how crap really runs but
> its the best familyish word I can come up with right now.)
> As long as I keep my foot in it its ok but if I just fire up the engine
and
> don't use the skinny pedal, it sputters and dies at least once. I can't
find
> any vacuum leaks. I checked by spraying WD on all connections including
> manifolds. I'm running 92 octane as recomended by MOPAR. The engine was
> rebuilt recently (before deployment) with basically all new guts. It's
done
> this since the install/rebuild. Any takers on what could be the problem?
> Thanks in advance for the advice..
> Rich Harris
> 86CJ7: Mopar MPFI, Detroit locker, 31 BFG AT's(for now) 1" body lift, Got
> money left over from deployment and it's going into gears, a front locker,
> Rubicon Express 2-1/2" YJ springs, one piece axles, and 33" BFG MT's. LIFE
> IS GOOD!
>
>
04-26-2004, 01:02 PM
#4
Guest
Posts: n/a
Re: Help with 258 Mopar FI
Isn't this just about standard running procedures with the MPI Kit? Mine
also does it and I've read a lot of others have it. I either try to toe tap
it through the warm up or just let it die the first time and after that it's
all right.
I have heard a sound like sucking on a straw up to a certian point when
starting and after that no which leads me to believe it's some kind of
vacuum problem. But I have never figured it out, yet.
You could call Hesco and ask them. Maybe they've come up with something by
now.
Bill
"Richard Harris" <SHARRIS11nospam@san.rr.com> wrote in message
news:RZajc.8989$IO6.1804@twister.socal.rr.com...
> Thanks again for the welcome back. I'm having some problems with my MOPAR
> fuel injection on my 258. It runs great once it's warmed up but upon first
> start in the morning it runs like crap. (not sure how crap really runs but
> its the best familyish word I can come up with right now.)
> As long as I keep my foot in it its ok but if I just fire up the engine
and
> don't use the skinny pedal, it sputters and dies at least once. I can't
find
> any vacuum leaks. I checked by spraying WD on all connections including
> manifolds. I'm running 92 octane as recomended by MOPAR. The engine was
> rebuilt recently (before deployment) with basically all new guts. It's
done
> this since the install/rebuild. Any takers on what could be the problem?
> Thanks in advance for the advice..
> Rich Harris
> 86CJ7: Mopar MPFI, Detroit locker, 31 BFG AT's(for now) 1" body lift, Got
> money left over from deployment and it's going into gears, a front locker,
> Rubicon Express 2-1/2" YJ springs, one piece axles, and 33" BFG MT's. LIFE
> IS GOOD!
>
>
also does it and I've read a lot of others have it. I either try to toe tap
it through the warm up or just let it die the first time and after that it's
all right.
I have heard a sound like sucking on a straw up to a certian point when
starting and after that no which leads me to believe it's some kind of
vacuum problem. But I have never figured it out, yet.
You could call Hesco and ask them. Maybe they've come up with something by
now.
Bill
"Richard Harris" <SHARRIS11nospam@san.rr.com> wrote in message
news:RZajc.8989$IO6.1804@twister.socal.rr.com...
> Thanks again for the welcome back. I'm having some problems with my MOPAR
> fuel injection on my 258. It runs great once it's warmed up but upon first
> start in the morning it runs like crap. (not sure how crap really runs but
> its the best familyish word I can come up with right now.)
> As long as I keep my foot in it its ok but if I just fire up the engine
and
> don't use the skinny pedal, it sputters and dies at least once. I can't
find
> any vacuum leaks. I checked by spraying WD on all connections including
> manifolds. I'm running 92 octane as recomended by MOPAR. The engine was
> rebuilt recently (before deployment) with basically all new guts. It's
done
> this since the install/rebuild. Any takers on what could be the problem?
> Thanks in advance for the advice..
> Rich Harris
> 86CJ7: Mopar MPFI, Detroit locker, 31 BFG AT's(for now) 1" body lift, Got
> money left over from deployment and it's going into gears, a front locker,
> Rubicon Express 2-1/2" YJ springs, one piece axles, and 33" BFG MT's. LIFE
> IS GOOD!
>
>
04-26-2004, 01:02 PM
#5
Guest
Posts: n/a
Re: Help with 258 Mopar FI
Assuming there's nothing weird like something loose, or the basic timing not
set right, this sounds like the idle stepper motor isn't boosting the idle
speed when cold. Could be caused by a bad ECM, MAP or temp sensor, or just a
bad connection somewhere. I'd go back and be sure you've got good
connections at the components, then run whatever MOPAR gave you in the way
of diagnostic routines. Owners of these MOPAR EFI kits I've come across
have raved about how well it performs, the Howell version too. Too bad
they're so expensive, but they sure are a good retrofit item on the 258.
Oh, also, FWIW, if you're ever going to consider 35's you should consider
the RE 4.5" kit rather than the 2.5.
set right, this sounds like the idle stepper motor isn't boosting the idle
speed when cold. Could be caused by a bad ECM, MAP or temp sensor, or just a
bad connection somewhere. I'd go back and be sure you've got good
connections at the components, then run whatever MOPAR gave you in the way
of diagnostic routines. Owners of these MOPAR EFI kits I've come across
have raved about how well it performs, the Howell version too. Too bad
they're so expensive, but they sure are a good retrofit item on the 258.
Oh, also, FWIW, if you're ever going to consider 35's you should consider
the RE 4.5" kit rather than the 2.5.
04-26-2004, 01:02 PM
#6
Guest
Posts: n/a
Re: Help with 258 Mopar FI
Assuming there's nothing weird like something loose, or the basic timing not
set right, this sounds like the idle stepper motor isn't boosting the idle
speed when cold. Could be caused by a bad ECM, MAP or temp sensor, or just a
bad connection somewhere. I'd go back and be sure you've got good
connections at the components, then run whatever MOPAR gave you in the way
of diagnostic routines. Owners of these MOPAR EFI kits I've come across
have raved about how well it performs, the Howell version too. Too bad
they're so expensive, but they sure are a good retrofit item on the 258.
Oh, also, FWIW, if you're ever going to consider 35's you should consider
the RE 4.5" kit rather than the 2.5.
set right, this sounds like the idle stepper motor isn't boosting the idle
speed when cold. Could be caused by a bad ECM, MAP or temp sensor, or just a
bad connection somewhere. I'd go back and be sure you've got good
connections at the components, then run whatever MOPAR gave you in the way
of diagnostic routines. Owners of these MOPAR EFI kits I've come across
have raved about how well it performs, the Howell version too. Too bad
they're so expensive, but they sure are a good retrofit item on the 258.
Oh, also, FWIW, if you're ever going to consider 35's you should consider
the RE 4.5" kit rather than the 2.5.
04-26-2004, 01:02 PM
#7
Guest
Posts: n/a
Re: Help with 258 Mopar FI
Assuming there's nothing weird like something loose, or the basic timing not
set right, this sounds like the idle stepper motor isn't boosting the idle
speed when cold. Could be caused by a bad ECM, MAP or temp sensor, or just a
bad connection somewhere. I'd go back and be sure you've got good
connections at the components, then run whatever MOPAR gave you in the way
of diagnostic routines. Owners of these MOPAR EFI kits I've come across
have raved about how well it performs, the Howell version too. Too bad
they're so expensive, but they sure are a good retrofit item on the 258.
Oh, also, FWIW, if you're ever going to consider 35's you should consider
the RE 4.5" kit rather than the 2.5.
set right, this sounds like the idle stepper motor isn't boosting the idle
speed when cold. Could be caused by a bad ECM, MAP or temp sensor, or just a
bad connection somewhere. I'd go back and be sure you've got good
connections at the components, then run whatever MOPAR gave you in the way
of diagnostic routines. Owners of these MOPAR EFI kits I've come across
have raved about how well it performs, the Howell version too. Too bad
they're so expensive, but they sure are a good retrofit item on the 258.
Oh, also, FWIW, if you're ever going to consider 35's you should consider
the RE 4.5" kit rather than the 2.5.
04-26-2004, 01:02 PM
#8
Guest
Posts: n/a
Re: Help with 258 Mopar FI
Isn't this just about standard running procedures with the MPI Kit? Mine
also does it and I've read a lot of others have it. I either try to toe tap
it through the warm up or just let it die the first time and after that it's
all right.
I have heard a sound like sucking on a straw up to a certian point when
starting and after that no which leads me to believe it's some kind of
vacuum problem. But I have never figured it out, yet.
You could call Hesco and ask them. Maybe they've come up with something by
now.
Bill
"Richard Harris" <SHARRIS11nospam@san.rr.com> wrote in message
news:RZajc.8989$IO6.1804@twister.socal.rr.com...
> Thanks again for the welcome back. I'm having some problems with my MOPAR
> fuel injection on my 258. It runs great once it's warmed up but upon first
> start in the morning it runs like crap. (not sure how crap really runs but
> its the best familyish word I can come up with right now.)
> As long as I keep my foot in it its ok but if I just fire up the engine
and
> don't use the skinny pedal, it sputters and dies at least once. I can't
find
> any vacuum leaks. I checked by spraying WD on all connections including
> manifolds. I'm running 92 octane as recomended by MOPAR. The engine was
> rebuilt recently (before deployment) with basically all new guts. It's
done
> this since the install/rebuild. Any takers on what could be the problem?
> Thanks in advance for the advice..
> Rich Harris
> 86CJ7: Mopar MPFI, Detroit locker, 31 BFG AT's(for now) 1" body lift, Got
> money left over from deployment and it's going into gears, a front locker,
> Rubicon Express 2-1/2" YJ springs, one piece axles, and 33" BFG MT's. LIFE
> IS GOOD!
>
>
also does it and I've read a lot of others have it. I either try to toe tap
it through the warm up or just let it die the first time and after that it's
all right.
I have heard a sound like sucking on a straw up to a certian point when
starting and after that no which leads me to believe it's some kind of
vacuum problem. But I have never figured it out, yet.
You could call Hesco and ask them. Maybe they've come up with something by
now.
Bill
"Richard Harris" <SHARRIS11nospam@san.rr.com> wrote in message
news:RZajc.8989$IO6.1804@twister.socal.rr.com...
> Thanks again for the welcome back. I'm having some problems with my MOPAR
> fuel injection on my 258. It runs great once it's warmed up but upon first
> start in the morning it runs like crap. (not sure how crap really runs but
> its the best familyish word I can come up with right now.)
> As long as I keep my foot in it its ok but if I just fire up the engine
and
> don't use the skinny pedal, it sputters and dies at least once. I can't
find
> any vacuum leaks. I checked by spraying WD on all connections including
> manifolds. I'm running 92 octane as recomended by MOPAR. The engine was
> rebuilt recently (before deployment) with basically all new guts. It's
done
> this since the install/rebuild. Any takers on what could be the problem?
> Thanks in advance for the advice..
> Rich Harris
> 86CJ7: Mopar MPFI, Detroit locker, 31 BFG AT's(for now) 1" body lift, Got
> money left over from deployment and it's going into gears, a front locker,
> Rubicon Express 2-1/2" YJ springs, one piece axles, and 33" BFG MT's. LIFE
> IS GOOD!
>
>
04-26-2004, 01:02 PM
#9
Guest
Posts: n/a
Re: Help with 258 Mopar FI
Assuming there's nothing weird like something loose, or the basic timing not
set right, this sounds like the idle stepper motor isn't boosting the idle
speed when cold. Could be caused by a bad ECM, MAP or temp sensor, or just a
bad connection somewhere. I'd go back and be sure you've got good
connections at the components, then run whatever MOPAR gave you in the way
of diagnostic routines. Owners of these MOPAR EFI kits I've come across
have raved about how well it performs, the Howell version too. Too bad
they're so expensive, but they sure are a good retrofit item on the 258.
Oh, also, FWIW, if you're ever going to consider 35's you should consider
the RE 4.5" kit rather than the 2.5.
set right, this sounds like the idle stepper motor isn't boosting the idle
speed when cold. Could be caused by a bad ECM, MAP or temp sensor, or just a
bad connection somewhere. I'd go back and be sure you've got good
connections at the components, then run whatever MOPAR gave you in the way
of diagnostic routines. Owners of these MOPAR EFI kits I've come across
have raved about how well it performs, the Howell version too. Too bad
they're so expensive, but they sure are a good retrofit item on the 258.
Oh, also, FWIW, if you're ever going to consider 35's you should consider
the RE 4.5" kit rather than the 2.5.
04-26-2004, 01:05 PM
#10
Guest
Posts: n/a
Re: Help with 258 Mopar FI
I'm calling them in 20 minutes....May have an answer soon
"William Oliveri" <wuji@bigvalley.net> wrote in message
news:c6jf5a$ccbup$1@ID-193866.news.uni-berlin.de...
> Isn't this just about standard running procedures with the MPI Kit? Mine
> also does it and I've read a lot of others have it. I either try to toe
tap
> it through the warm up or just let it die the first time and after that
it's
> all right.
>
> I have heard a sound like sucking on a straw up to a certian point when
> starting and after that no which leads me to believe it's some kind of
> vacuum problem. But I have never figured it out, yet.
>
> You could call Hesco and ask them. Maybe they've come up with something
by
> now.
>
> Bill
>
>
>
> "Richard Harris" <SHARRIS11nospam@san.rr.com> wrote in message
> news:RZajc.8989$IO6.1804@twister.socal.rr.com...
> > Thanks again for the welcome back. I'm having some problems with my
MOPAR
> > fuel injection on my 258. It runs great once it's warmed up but upon
first
> > start in the morning it runs like crap. (not sure how crap really runs
but
> > its the best familyish word I can come up with right now.)
> > As long as I keep my foot in it its ok but if I just fire up the engine
> and
> > don't use the skinny pedal, it sputters and dies at least once. I can't
> find
> > any vacuum leaks. I checked by spraying WD on all connections including
> > manifolds. I'm running 92 octane as recomended by MOPAR. The engine was
> > rebuilt recently (before deployment) with basically all new guts. It's
> done
> > this since the install/rebuild. Any takers on what could be the problem?
> > Thanks in advance for the advice..
> > Rich Harris
> > 86CJ7: Mopar MPFI, Detroit locker, 31 BFG AT's(for now) 1" body lift,
Got
> > money left over from deployment and it's going into gears, a front
locker,
> > Rubicon Express 2-1/2" YJ springs, one piece axles, and 33" BFG MT's.
LIFE
> > IS GOOD!
> >
> >
>
>
"William Oliveri" <wuji@bigvalley.net> wrote in message
news:c6jf5a$ccbup$1@ID-193866.news.uni-berlin.de...
> Isn't this just about standard running procedures with the MPI Kit? Mine
> also does it and I've read a lot of others have it. I either try to toe
tap
> it through the warm up or just let it die the first time and after that
it's
> all right.
>
> I have heard a sound like sucking on a straw up to a certian point when
> starting and after that no which leads me to believe it's some kind of
> vacuum problem. But I have never figured it out, yet.
>
> You could call Hesco and ask them. Maybe they've come up with something
by
> now.
>
> Bill
>
>
>
> "Richard Harris" <SHARRIS11nospam@san.rr.com> wrote in message
> news:RZajc.8989$IO6.1804@twister.socal.rr.com...
> > Thanks again for the welcome back. I'm having some problems with my
MOPAR
> > fuel injection on my 258. It runs great once it's warmed up but upon
first
> > start in the morning it runs like crap. (not sure how crap really runs
but
> > its the best familyish word I can come up with right now.)
> > As long as I keep my foot in it its ok but if I just fire up the engine
> and
> > don't use the skinny pedal, it sputters and dies at least once. I can't
> find
> > any vacuum leaks. I checked by spraying WD on all connections including
> > manifolds. I'm running 92 octane as recomended by MOPAR. The engine was
> > rebuilt recently (before deployment) with basically all new guts. It's
> done
> > this since the install/rebuild. Any takers on what could be the problem?
> > Thanks in advance for the advice..
> > Rich Harris
> > 86CJ7: Mopar MPFI, Detroit locker, 31 BFG AT's(for now) 1" body lift,
Got
> > money left over from deployment and it's going into gears, a front
locker,
> > Rubicon Express 2-1/2" YJ springs, one piece axles, and 33" BFG MT's.
LIFE
> > IS GOOD!
> >
> >
>
>
