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Old 10-22-2009, 05:55   #1 (permalink)
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Trouble Starting In the Morning

I own a 2001 Ford Explorer Sport Trac. I am having problems starting it mainly first thing in the morning. Very rarely does it happen during the day. The engine turns easily but unless I give it some gas it will die almost immediately. Even sometimes when I let off the gas, the engine will sound like it's rumbling and then slowly die. It seems like I can onl;y keep it started when I give it some gas for atleast 10 seconds or so.

I have already replaced the MAF sensor and the IAC valve. I have yet to clean the throttle body, but I am doing that this weekend. Autozone has already confirmed my battery and my alternator is good.

Does anyone else have any suggestions on what might be the problem? I was pretty certain it was the IAC, but then I had trouble starting it the next morning after I replace it. There also does not seem to be any loose or broken hoses...

Jeff
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Old 10-22-2009, 08:34   #2 (permalink)
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Re: Trouble Starting In the Morning

Have you checked for any codes? Did you replace the MAF and IAC for this problem and it made no improvement?
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Old 10-22-2009, 08:53   #3 (permalink)
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Re: Trouble Starting In the Morning

Yes, I already replaced the MAF and IAC. Those were the codes that AutoZone told me were coming up. Still having the same problem though...

Could it be the throttle position sensor?
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Old 10-22-2009, 09:22   #4 (permalink)
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Re: Trouble Starting In the Morning

If you unplug the IAC does it idle just a little low? That would be normal. Have you checked the engine vacuum at idle? Should be around 21".
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