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Old 09-12-2009, 13:31   #1 (permalink)
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confused 93 Mustang 5.0 problem

I have a 93 Mustang LX w/ 5.0L engine with 103,000 miles on it. Recently the engine began losing compression and backfiring when in low gear, either starting from a dead stop or going up a hill). It happens when the engine is cold or warm.

Any suggestions on what the problem is?

Thanks.
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Old 09-12-2009, 17:01   #2 (permalink)
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Re: 93 Mustang 5.0 problem

Has it had spark plugs or fuel filter lately? Any check engine light on? Cleasning the IAC and MAF also help them run better.
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Old 09-28-2009, 14:49   #3 (permalink)
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Re: 93 Mustang 5.0 problem

You said it's losing compression. Is that a gut feeling or did you do a compression test? If so, usually it's 1 or 2 cylinders which are low and require further diagnosis.
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If compression is actually OK, first place to check a misfire is the secondary portion of the ignition system (plugs, wires, coil).
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