Richard,
I am enclosing a couple of fixes from a network that I belong to, for
similar problems. Because you are getting fuel odor I would suspect the
ignition problem.
The components in the system that have a major effect on fuel mixture
are the Air Temp & Water Temp sensors (both thermisters), and the MAP
sensor. If you have a way of checking these when the problem occurs,
maybe you could pin it down. The thermister has high resistance when
cold (over 1000 ohms) and low when hot (100 to 200 ohms).
___ORIGINAL MESSAGE___
hi jeep techs. this jeep will not start sometimes after the
engine is hot and the vehicle sits for a hour. the starter
cranks fine. there is spark at the plugs. the fuel injectors
are pulsing. i found today that i had no fuel pressure when
this condition happens. the fuel pump and relay are new.
replaced with dealer parts. alldata is showing a fuel pump
ballast bypass relay. i can not find this part. i did not
have power at the orange and black wire at the fuel pump. is
the ballast relay the same as the fuel pump relay?
__________________________ FIX ____________________________
this vehicle finally would not start at all. we had power and
ground at the fuel pump. removed fuel pump and bench tested
pump. the new dealer pump was bad. cleaned the gas tank again
and replaced the fuel pump with another dealer pump. the
vehicle is still running. i hope this pump is better than the
other pump. even new parts can go bad. we never found the
ballast relay on this vehicle. we did replace the asd and
fuel pump relays. thank you again for all of the replies on
the post.
_ ORIGINAL MESSAGE _____________________
I have this 86 Cherokee with intermittent no start. Starts
cold no problem. Drive 10 miles or so will start back up
right away, let set for 20 minuets... No Spark. Crank over a
long time and will start. I first thought it was a fuel
problem but yesterday when it acted up I had fuel but no
spark.
I tested coil with ohm meter and checked out OK, but don't
know if no start condition was present.
Any one with suggestions? We are a government shop and don't
have any modern test equipment.
___________________________ FIX ____________________________
Turned out to be pick up coil. Thanks to the many techs that
answered.
Tom, Redding CA - #216 D/GCC
Richard J. Hockert, Esq. wrote:
>Last year there was a post by a lister who was having hard starting
>problems with a Jeep Grand Cherokee V8. I can't seem to find the thread
>so, please, with all the experts on this list help if you can. I am having
>starting problems with my grocery getter Jeep. Here are the symptoms:
>
>1) Starts immediately when cold in the morning (summer or winter);
>2) Starts immediately when shut down for a few minutes at the store, mail
>box, etc.
>3) Very difficult to start if shut down and wait an hour or two (go to the
>shop?). Engine still slightly warm.
>4) When it finally starts under 3) and I back out through the exhaust
>fumes, I can smell gas, like the engine was way rich when trying to start.
>5) Once the engine is running, no problems under any of the above conditions.
>
>I have replaced the idle air motor. The throttle position sensor is not
>sticking in any position. If it is a temp sensor, would it be water
>temp? Or, computer problem setting the virtual "choke"? Any one
>experienced this and fixed it?
>
>Thanks very, very much for the help.
>
>Best regards
>Jim
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