1993 4.0 liter need a little help.

[Rc Ranger]

I just purchased the above vehicle not running. Checked the codes present in memory and found the MAF sensor bad. Replaced sensor and got vehicle running. Problem is when I start cold it dies almost immediatly Takes two or three times restarting before it runs. When it does run after warming up it idles for awhile then abrubtly dies. Restarts right away like nothing is wrong. Only codes being generated are H2os running lean. I have checked fuel pressure and it is 31# at idle and does not drop off when vehicle dies. Does rise to 45# while key is still on. checked resistance on tps and found no problems, IAT and coolant sensor all check out good for temperature they are at. Checked vac lines and found no leaks or slits in hose. reseated connector to PCM and that didn't help either. Anyone have any other ideas I would sure appreciate hearing them.

Thanks,

Rc Ranger

 

[martin]

Sounds like a vacuum leak, possibly on the intake.

 

[AllanD]

Or a bad IAC

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