1989 5.0 Cold ROUGH Idle - Muscular Mustangs
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post #1 of 9 Old 12-04-2006, 07:20 PM Thread Starter
 
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1989 5.0 Cold ROUGH Idle

Any ideas on what could be causing a rough idle when first started. It ussually starts right up and then kills, after 5 minutes of running it idles great and has no problems. I have cleaned the throttle body and the wires in the MAF, the guy I bought it from said he had replaced the Idle Control Valve. I don't have much of a budget or I would take it in and have a mechanic look at it. Any easy troubleshooting suggestions?

Thanks in advance
Derek
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post #2 of 9 Old 12-04-2006, 07:33 PM
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Check for vacuum leaks around manifold. And Sometimes if your engine runs really rich when you first start it up it causes it to stumble or run rough. Air filter dirty? EGR valve dirty or not functioning. This is why I don't really like EFI because one symptom could be 1 of 100 things! Check PCV valve and spark arrestor (little filter under pcv), check TPS voltage, Check timing, Check fuel pressure replace fuel filter, Check cap, rotor, plugs, and wires, MAP sensor, Or you can try taking cables off battery for 30mins to reset computer. I did this on a buddies Stang and it fixed the problem. Dirty fuel injectors. This is a list of the things that I could remember from Snap-On ShopKey when I was looking for troubleshooting for my friends Mustang.

Bright Regetta Blue 1988 Mustang GT 5.0

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post #3 of 9 Old 12-05-2006, 12:42 AM
 
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i have to agree with mike, fuel injection stangs are a big pain in the ass. i would start with vaccum leaks then check the timing and see where thats at, it should be somewhere between 10-16 degrees btdc. let us know what comes of it.
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