95 ex rough idle after warm

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Nov 7, 2005 | 09:30 PM

LOTR-HAMMER

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From: CANADA

95 ex rough idle after warm

wasnt really sure how to search this one with accurracy. so i will post a new topic

Just got another truck. first start of the day runs great. but once warm, if you stop and get out for a short period of time and go to start again, it runs like a bag of crap until you get going, maybe 3 minutes or less. no engine light or trouble lights come on. so my theories are, tps not right, but that would throw a code. maybe an injector is flooding a cylinder. but i just did all the plugs and they were ok and the same. then maybe exhaust is plugging up or something but thats a long shot, because if the cat was bad, I would have not just passed the emmisions test today. I dont believe there are any codes to read because no lights come on so I have to ask the masses

i did read one thread about a loose connection ont he computer or maybe a fuel regulator.

any other ideas

thanks

Nov 7, 2005 | 09:49 PM

mrshorty

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From: UT

Quote:

Originally Posted by LOTR-HAMMER

... I dont believe there are any codes to read because no lights come on so I have to ask the masses

Does this mean you haven't attempted to pull codes? Many (most?) EEC-IV monitored faults in this case would trigger the check engine light, but not always. It might be worth 5 minutes to pull codes and see (EEc-IV only requires a paper clip to pull codes). If you get all pass codes, then move on from there.

That said, I think the fuel pressure regulator is a possibility. The most common failure mode for the FPR is for the diaphragm to leak. This can leave the engine "flooded" on warm starts which could lead to hard warm starts and a temporary rough idle on warm start. Run the engine for a bit, then shut it off and pull the vacuum line off of the FPR. If there's gas in the vacuum line, the FPR needs to be replaced. If that's inconclusive, consider puitting a fuel pressure gauge on it and see what it does on warm starts.

Nov 7, 2005 | 10:13 PM

LOTR-HAMMER

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no havent pulled codes yet but I do have the one tester for the eec-IV. This truck also has a computer plug-in under the steering column. I am assuming that is the more advanced code reader plug which I do not have yet. but I will test the fuel regulator tommorrow and codes too for the hell of it thanks

Nov 8, 2005 | 05:01 AM

marragtop

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From: Baltimore

On the 95's, the port under the steering wheel is non functional. It's intended to be the OBDII port, but 95 was a transition year for Ford to go from EECIV to OBDII. Use the EECIV connection under the hood to pull the codes.

Nov 8, 2005 | 01:15 PM

LOTR-HAMMER

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From: CANADA

well nothing on the code reader and the pressure reg valve has no gas in the vacume hose. and today so far is not being a pain. the search continues

Nov 8, 2005 | 01:52 PM

mrshorty

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From: UT

Nothing on the code reader meaning "nothing at all" or all 111 pass codes?

Intermittant faults like this can be real pain to track down, because you have to be "looking" at it at the same time as it acts up.

Nov 9, 2005 | 01:25 PM

LOTR-HAMMER

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From: CANADA

ok well i did get a few readings on the code reader. one was a throttle position sensor and the other was a egr valve not propper. I did change teh fuel filter and tested the fuel pressure which is 26 psi at idle a little low i am thinking so I might go and change that next if i do maybe the other 2 codes will vanish because they show up once in a while and the truck does have 178,000 kms