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Unread 11-17-2005, 06:28 PM   #1
BUMMER
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93 Grand Cherokee start problem

I have a 93 G. Cherokee with a 4.0 with starting problems. I have to turn the ignition switch to the on position for about 90 seconds before I hear a relay energize in the power distribution box and the jeep will start. It will keep starting as long as I don't let it sit to long. But when I go to start it the next day the problem starts all over again. Once it starts it runs fine. If the fuel pump is losing pressure it should'nt take 90 seconds to build up pressure. Has anyone experienced this problem before. Thanks

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Unread 11-17-2005, 06:35 PM   #2
Jeep-Tech1
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Could be the ASD relay. But you will probably be better off to go ahead and get a PCM and it should correct your problem.
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Unread 11-17-2005, 06:47 PM   #3
guango88
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have you change your fuel filter lately?
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Unread 11-17-2005, 06:52 PM   #4
Jeep-Tech1
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and bummer i have seen this very same problem before to the T. And I diagnosed it to be the PCM. And guess what.............................................. ........ It was. Put a PCM on there and like magic it fixed it. Man you just dont know what a good technician and a fluke meter can figure out. Thats why I get payed as much as I do.Cause I eat, sleep, and breath and s__t jeeps from 8-6 mon-fri all year long....
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Unread 11-17-2005, 06:56 PM   #5
guango88
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well, another problem solved
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Unread 11-18-2005, 09:58 AM   #6
sastanley
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Hi guys...new member...I seem to be having a similar problem, but I am pretty new to Jeeps and need some acronym help, like what a PCM is.

My wife cranks our GC for 15-20 secs now that it is cold out and gets it to cough and then cranks it again and it will start...runs fine, but hard to start in the cold.

Mechanic buddy mentioned check valve's etc..that may be not holding fuel in the lines or fuel enrichment features may be mafunctioning..

Willing to take all suggestions...just need some guidance from the experts.

Thanks!

edit - Hi - Reading FAQ's now...ignore my newbie post

Last edited by sastanley; 11-18-2005 at 10:33 AM..
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Unread 11-18-2005, 11:27 AM   #7
Jeep-Tech1
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What year is your grand?
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Unread 11-18-2005, 12:50 PM   #8
poconosms1
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what is the PCM

I;m having the same problem, so what is the PCM?
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Unread 11-18-2005, 12:53 PM   #9
greasefingers
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PCM=ECU=computer
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Unread 11-21-2005, 08:50 PM   #10
geeves66
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loss of standby fuel pressure

I am in the process of finding out why Grand 2002 4.0 does the same thing. So far this is what my mechanic and I found. Fuel pressure at fuel rail 52# during idle. When engine shuts off, fuel pressure supposed to hold pressure for around 10 min (i think) My pressure drops to 0 in approx 10 sec. Bubbles in the fuel rail when purged. (due to heat boiling the fuel at low pressure in line) Could have injector leaking or fuel tank check valve leaking. I am hoping for the check valve problem. I am changing my filter/regulator tomorrow and adding an inline fuel check valve to try first. If that don't work, I will just change all injectors with new ones. Bosch set around $180 i think. GM service bulletins have a known problem with the check valve in the tank. And dealer does not sell just the valve. Write up says you need to change the tank. This is a recall on some models. Will try and go that route if this be the problem. And that is my two cents.

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Unread 02-23-2006, 01:22 PM   #11
sastanley
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Quote:
Originally Posted by Jeep-Tech1
What year is your grand?
Geez...sorry I am a slacker..

I have a '93 ZJ with the I6. I've since done some more searching and FAQ reading and pretty sure it is the PCM, as mentioned here. It's been three months and it isn't getting any better. Does it eventually just not work anymore and you get stranded?

I have a little extra cash now so I am going to dig under the hood today and see which ECM I have so I can order one from these rock auto dudes.
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