1993 4.0 liter need a little help.

Rc Ranger · 10-28-2007, 07:52 PM

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 · 10-28-2007, 08:44 PM

Sounds like a vacuum leak, possibly on the intake.

**AllanD** · 10-29-2007, 09:55 AM

Or a bad IAC

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10-28-2007, 07:52 PM	#1
Rc Ranger New Member Join Date: Oct 2007 Year: 1993 Make: Ford Model: Ranger XLT Posts: 5 Rep Power: 0 iTrader: (0)	1993 4.0 liter need a little help. 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
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10-28-2007, 08:44 PM	#2
martin Member Join Date: Aug 2007 Location: St Bruno, Quebec Year: 1984 1991 Make: ford Model: b2 explorer Posts: 2,778 Rep Power: 20 iTrader: (0)	Sounds like a vacuum leak, possibly on the intake.
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10-29-2007, 09:55 AM	#3
AllanD RBV Technical Advisor Join Date: Jun 2001 Location: East-Central Pennsylvania Year: 1987... sorta Make: Ford Model: Ranger Supercab Engine: '93 4.0 Class: 4x4 Used For: Roadtrip Warrior Posts: 7,169 Rep Power: 47 iTrader: (18)	Or a bad IAC AD __________________ Gun Control - A theory espoused by some monumentally stupid people; who claim to believe, against all logic and common sense, that a violent predator who ignores the laws prohibiting them from robbing, raping, kidnapping, torturing and killing their fellow human beings will obey a law telling them that they cannot own a gun.
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