Warm Start Problem
12-29-2015, 05:43 PM
#1
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Location: El Toro, CA
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Year: 1998
Model: Grand Cherokee
Engine: 6.0
Warm Start Problem
98 ZJ starts fine when cold, but has problem starting after the engine gets warm, not all the time but enough to make it a pain. Replaced coil still does it. any ideas out there...
4.0 High Output I6
4.0 High Output I6
Last edited by moyneur; 12-29-2015 at 06:03 PM.
12-29-2015, 05:49 PM
#2
Old fart with a wrench
Welcome to CF, but we're going to need more info. What are you calling a 6.0? Do you mean a 4.0 I6 or a 5.9 V8?
12-31-2015, 06:43 AM
#5
Old fart with a wrench
Yes, and Mopar has a cure for it. There is an aluminum wafer heat shield that goes over the manifold and under the fuel rail. It sort of looks like cardboard to me! They put one on my 2000 WJ when it was recalled for seatbelt shoulder anchor bolts, a PCM reflash, and the heat shield. It's supposed to keep exhaust manifold heat from boiling the fuel in the rail and keep debris from catching fire. It seems the cast iron manifolds hold too much heat and don't cool off quick enough.
Being in a high temperature environment like SoCal, you're steel manifold is probably doing the same thing. There was a poster in AZ that had this problem and vented the hood supports to try to cool it down.
Being in a high temperature environment like SoCal, you're steel manifold is probably doing the same thing. There was a poster in AZ that had this problem and vented the hood supports to try to cool it down.
Last edited by dave1123; 12-31-2015 at 06:49 AM.
12-31-2015, 01:40 PM
#6
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Year: 2002
Model: Grand Cherokee
Engine: 4.0 I6
They also suggest wrapping one of the fuel injectors with a small heat shield. My 2002 has never not started, but has always started funky between 1-3 hours after running, starts perfectly hot or cold. I wrapped all my injectors and fuel rail with heat tape and vented my hood but have never cured the problem. They also make modules I believe that will run your engine fan after shut down and terminate based on time or temperature.
12-31-2015, 09:07 PM
#7
Old fart with a wrench
lurk520, that must have been you I just mentioned, right? I wondered how that venting worked.
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12-31-2015, 11:31 PM
#8
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Year: 2002
Model: Grand Cherokee
Engine: 4.0 I6
I think so. It works somewhat, I remember checking temps on the hood with an infrared temp gun, the back where I drilled the exit holes was the hottest part, so heat was definitely getting out of there. Probably not as effective as installing Lebaron hood vents like some people do on their XJs, but it was easier and you wouldn't even notice it if you didn't know any better. Pretty sure I posted pictures in a thread some where.
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