cold start/idle/run intermittent issue - JeepForum.com

 
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post #1 of 4 Old 10-15-2013, 01:11 PM Thread Starter
philWJHuntley
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1997 ZJ 
 
Join Date: Oct 2013
Location: London
Posts: 2
cold start/idle/run intermittent issue

My grand Cherokee 4.0 (65,000m) has just been serviced, new battery, new starter motor (this issue broke the original).
For years it has had a mild idle issue and seems to always hunt slightly. It is much worse now, where some days, I have to put the gas peddle to the floor and painfully crank until it starts which it usually does (good ole jeep!). I had to do this every time until a recent overdue service. Despite the service there is a problem still. Once it starts it then idles terribly and drives badly although this sometimes clears after a while. Others days it starts and drives ok!
At the moment I cannot drive it, when revved in Park or I try and drive it, it looses power and misses. It seems, when under pressure, it folds like it is being starved of fuel or a spark.
Any advice would be much appreciated.
Phil (London, UK)


Last edited by philWJHuntley; 10-15-2013 at 03:25 PM.
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post #2 of 4 Old 10-15-2013, 06:16 PM
ZeeJay1997
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1997 ZJ 
 
Join Date: Dec 2008
Posts: 8,664
are you running petrol or LP?

If you're running petrol. sounds like the fuel pressure may be the issue. There's a port on the fuel rail to attach a gauge. Should be reading 49 plus or minus 5 PSI
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post #3 of 4 Old 10-22-2013, 06:31 AM Thread Starter
philWJHuntley
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1997 ZJ 
 
Join Date: Oct 2013
Location: London
Posts: 2
Thanks ZeeJay
it is fuel - i'll get that tested.

is LP worth doing?
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post #4 of 4 Old 10-22-2013, 07:05 PM
ZeeJay1997
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Quote:
Originally Posted by philWJHuntley View Post

is LP worth doing?
I dont know because that's a UK thing. I know of at least on forum member over there that has a dual fuel unit.
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