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Unread 01-15-2014, 12:26 PM   #1
MadDog96
Registered User
2001 WJ 
 
Join Date: Jan 2014
Location: Kingsport, Tennessee
Posts: 41
96 GC problems pullin' my hair out!

I'm new to the forum, so please bear with me. I've got a 96 Grand Cherokee 4.0 that I just can't figure out. This isn't my first one, I've had GCs before now but this one has me stumped! I bought it for a song, running rough, stalling and a few other issues like the door locks working all by themselves going down the road and the alarm stopping the truck from running from time to time. Well, to make a long story shorter, I,ve bypassed the alarm system by taking all the panels off the doors and putting a wire between the harness contacts. Problem solved there. So far I have replaced every engine sensor, T.P.S., M.A.P. A.I.C, Both O2 sensors, got a reman P.C.M. checked for vacuum leaks, cleaned all grounds, all to no avail. The only thing I haven't replaced are the fuel pump and filter. Cat and muffler are new. This process of elimination is costing me dearly. One thing, after running at idle for a few minutes , shut it down, and take the cap off the fuel rail, press the valve and just a dribble comes out. Now I know These have to have 45 to 50 Lbs. to run. Should it retain pressure after shutdown? Have I just guessed my problem?

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Unread 01-15-2014, 02:09 PM   #2
dr hook
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1996 ZJ 
 
Join Date: Feb 2006
Location: Cedartown, GA
Posts: 661
yep. sounds like fuel pump issues to me.
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Unread 01-15-2014, 06:12 PM   #3
MadDog96
Registered User
2001 WJ 
 
Join Date: Jan 2014
Location: Kingsport, Tennessee
Posts: 41
drhook, Thanks for confirming my suspicions. There's not much of anything else it could be. Like I said in my previous post, I've had other GCs in the past, and I've never had anything but small issues that didn't take that much to figure out. Of the 4 GCs I've had the '95 was an alarm problem, hence the jerry-rigging of the door switches. My '97, a water pump and belt, My son's '95, fuel pump and crank shaft sensor, my wife's '97 instrument panel lights flickering, all no big deal. I'm sure that since my '96 has 231,000 miles on it all the sensors needed to be replaced anyway, along with the new P.C.M. I've been following this forum for two years just to get an idea about what issues other members are having with their G.C.s. I just joined the forum lately and I'm glad I did! If anybody else has any ideas I would love to hear from you.
Once again , thanks for the reply, Maddog96
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