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Old January 11th, 2006, 06:39 PM   #1
mschaffer66
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Default Cold blooded 4.0L?

Bubicon...what a pain in the ass...

The past few days starting it after sitting for awhile takes some effort. After it starts I need to hold the throttle at about a 1k idle until it warms up a bit. Otherwise it dies out.

It reminds me of how my jeep used to be cold blooded when it was carbed.

Is there anything that could be causing this? I've never had the problem with a FI vehicle.

Thanks
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Old January 11th, 2006, 07:21 PM   #2
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T.p.s.
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Old January 11th, 2006, 07:39 PM   #3
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I just told Kerry that Rocky said it was the T.P.S....she said, "Totally Perfect Spelling?" hehe

God I hate jeeps.
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Old January 11th, 2006, 07:41 PM   #4
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if you can check the codes see if its getting a code for the pruge valve at the fuel tank. some times they get plugged with mud and don't vent the tank right
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Old January 11th, 2006, 07:43 PM   #5
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Its not lighting the SES light....but do 97 TJ's have them?
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Old January 11th, 2006, 07:52 PM   #6
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if I remember right all the TJ's had them. its attached to the hoses where the charcoal canister is. make sure the tank vents and stuff are clean and free of mud
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Old January 11th, 2006, 07:58 PM   #7
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a couple of other things crossed my mind while digging through the boards tonight.
have you checked your fuel pressure? if its above 45 psi its fine, but if its low while cranking it could be its not pushing hard enough to get a pattern.
also did you modify anything lately? if so you may want to backtrack to see if you disturbed something like a vacuum hose or a purge line under the hood

my one other quetion is fuel. has it been acting up since your last fill up? could you have gotten water in the tank? dry tossing in some dry gas to be sure
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Old January 11th, 2006, 08:04 PM   #8
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It just started this morning. I put a K&N filter in it sunday and have since put 100 or so miles on it. Its still on the same tank of fuel.

This really wouldn't be that big of an issue, but the jeep is having some sort of charging or battery issue and all you really get from a cold start is once chance to get it running otherwise its jumper cables time. I thought this could the the problem maybe it was getting low voltage to the sensors, but it holds a fairly steady 12-14v on the gauge.
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Old January 11th, 2006, 08:23 PM   #9
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My truck had an Airaid filter & runner on it when it was new, It ran like crap cold, I would switch to stock and see if its better
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Old January 11th, 2006, 08:26 PM   #10
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and as for the charging system on this, its controlled through the engine computor for regulator output. so if you don't see 13.5 volts or more right off Idle then its got a problem. I would check all the grounds to the body chassie and engine they seem to be rather good at corroding.
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Old January 17th, 2006, 12:53 PM   #11
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Quote:
Originally Posted by Rocky
T.p.s. reports
And make sure you use the cover sheets!!


My suggestion: Since you say the vehicle will stay running if you keep your foot on the throttle, I suggest the IAC may be the problem. Try removing the IAC, and fill it with carb cleaner and let it sit for a while. Then blow it out with compressed air and reinstall. Give it a try!
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