2000 4.0 SOHC Starting Problem

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Jul 12, 2006 | 08:42 AM

kevinm55

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2000 4.0 SOHC Starting Problem

Hello all

First off great website!! I have a 2000 4.0L SOHC w/ 60,000 miles on it that has a hard start problem that I am trying to figure out and correct. When I try to start the truck (after sitting all day in the sun) it turns over/cranks but the engine does not run/sputter or even cough. If I apply throttle while cranking I can get the engine to start - after revving the motor several times I can put the truck in drive and it will then operate flawlessly (and also re-start w/o issue after that). The battery in the truck is brand new and fully charged; the fuel filter was replaced at 40,000 miles, air filter is almost new and spark plugs were replaced 5,000 miles ago. I run 87 octane fuel.

I think that my problems are either fuel pressure or injector related but would appeciate any opinions/input that anyone else may have. Of particular note, the truck starts without any issue early in the morning (when cold). Finally, it is worth noting that I live in NY where we now are required to use fuel that contains 10% ethanol. Any advice on this issue will be appreciated!!

Jul 23, 2006 | 09:52 AM

tapper95

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I have the same problem in my 99 SOHC but it seems worse in hot humid weather. I was thinking about checking sensors but I don't know where to start...

Jul 24, 2006 | 10:09 AM

euforia51

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From: Charlotte

Gee... I just posted something similar for my 2000 Mountaineer SOHC. Went out this morning to start it and it won't idle. Hold the gas, and it runs great. Let off the gas and it dies. Not sure if it's weather related or not; though I do tend to doubt it. My guess is a sensor somewhere... but which one. Hopefully, someone can/will help us all out here.

Jul 24, 2006 | 11:01 AM

euforia51

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From: Charlotte

Doing some digging here, I was able to find something that might be the cause. The IAC (Idle Air Control) valve. A good troubleshooting post here from someone who's had a very similar problem. I'm going to try this myself when I get home.

https://www.ford-trucks.com/forums/s...ht=engine+idle

Jul 24, 2006 | 12:32 PM

ledbetter

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From: Pcola, FL

Yeah, it sounds like you have the IAC problem. You can clean it out for a temp fix (weeks or maybe months) or you might replace it. I'd clean it out first to make sure it's the problem...

Jul 24, 2006 | 06:47 PM

reponick27

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The IAC is a good place to start. You should be able to clean it and notice a difference which should tell you whether or not it is the problem. Other possible causes would be the MAF and EGR. Had the very same problem on a 98 Grand Marquis. Unplugged the MAF and saw a HUGE difference. The only reason I say EGR is because it could be causing exhaust pressure to back up until the engine is warm and it opens fully. Just my .02 based on past experience. Do you ever get a check engine light at all? If so, take it to a parts store and have the codes read. That will narrow down your problem a lot rather than trying to diagnose it with your checkbook which gets costly. Most auto parts stores will check the codes for free and it doesnt take long. Hope this helps.
Nick

Jul 24, 2006 | 08:31 PM

euforia51

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From: Charlotte

My problem posted here (not idling) and in another post appears to be the IAC. Took it off and cleaned it with carb cleaner when I got home tonight. The little valve in there appeared to be stuck; and there was a coating of black soot on the internal chambers. After cleaning, popped it back on and the engine started right up. Thanks to all for posting with suggestions. And best of luck to the other posters. The IAC is a very good place to start, I would say!