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post #1 of (permalink) Old 07-14-2003, 06:32 AM Thread Starter
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a little o/t - ZJ 4.0 will not start

Thought I would post here before trying the mid-size forum..., you guys always seem to have good advice. Here goes....

1. I flushed the cooling system in my wife's ZJ (Grand Cherokee). It has the 4.0. Has about 97,000 miles on it.
2. Got a little bit of water sprayed around the engine compartment..., not a whole lot, but enough to make a mess. It is my personal opinion that those flush and fill kits aren't worth the three or four bucks you pay for them.
3. After cleaning up the mess, I started the engine. It ran for about 20 seconds.., sounded fine, started to idle rough and then it died.
4. Have not been able to get it started since. It will turn over, but will not start. [img]images/graemlins/cussing.gif[/img]
5. Have checked the following: checked all of the fuses on the power center under the hood + in the fuse panel in the cab just to be sure, checked the OBD codes.. got 12 and 55... which is just battery has been disconnected and end of cycle, fuel pressure is good.. around 31 psi, ohm'd the coil - primary was good.. but my meter does not read high enough to ohm the secondary, made sure distibutor cap was not wet, checked the spark.. and had spark at 5 of the 6 plugs... #6 is a pain to get to, ohm'd the injectors..they are all good (will be getting a noid/test light to verify they are firing when the parts stores open up)
6. I am at a loss..., anyone have any suggestions on what to check next or what I did to screw this thing up??? Thx.
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post #2 of (permalink) Old 07-14-2003, 03:57 PM
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Re: a little o/t - ZJ 4.0 will not start

1. I think we can "assume" it's water damage related.
2. The fact that you have spark is a good think...
3. But where's the spark timed at...
4. And are the injectors firing?[*] Remove the plugs,[*] Turn the ignition to run,[*] Turn the engine over by hand.[*] Listen for injectors clicking.[*] And pressurization of the line by the fuel pump.
5. And is the fuel pump pressurizing the fuel rail?
6. If you pull the plugs, are they wet or dry?
7. A little more information please?
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post #3 of (permalink) Old 07-15-2003, 02:02 AM Thread Starter
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Re: a little o/t - ZJ 4.0 will not start

Leve, thanks for the reply..., turned out to be the coil. I had checked for spark before.., and had it.., maybe it was too weak?? I dunno. I swapped a coil from my parts Jeep and the ZJ fired right up. Tried to buy a new one from the auto parts store..., but they said they don't stock coils.., they would have to order them.., five days to get it here. [img]images/graemlins/lame.jpg[/img] Anywho.., it lives and the wife is happy again. [img]images/graemlins/RockOn.gif[/img]
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