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Old 09-21-2002, 03:05 PM
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Post Spark Knocking Fords

My wife's car is a 99 3.8 Mustang with automatic. This little jewell spark knocks like crazy unless you run Chevron 91 in it. I've scanned it with my Snap On scanner, and come up with nothing, i've checked knock sensor operation, changed spark plugs, put in a new fuel filter, checked the cts, the fuel trim looks good, I can't figure out why it does this, and conversely , I am going to sell the car, and drive a 97 Crown Victoria police car, but this sucker spark knocks like crazy also. I can maybe understand the squad car, maybe it requires premium fuel, but the Mustang shouldn't in my opinion. Anyone experiencing the same problems?

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Old 09-21-2002, 04:16 PM
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You need to review TSB 98-23-10

Lean Driveability Symptoms
MAF Sensor Contamination
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Old 09-22-2002, 02:32 PM
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If it has a lot of miles it could be excessice carbon build up. The carbon will build on the top of the pistons and create a similar effect of a smaller combustion chamber making a higher compression ratio. To cure this on a carbuerated engine you would pour ATF down the carbuerator while its reved up a little until it stalls. Then you let it sit for a day or two to let the ATF soak into the carbon and then start it up again. The atf will soften the carbon and blow it out. If that was the problem, it should be gone. ATF is a very good detergent. YOu could also do this same method with water instead. I wouldn't know to go about this method with fuel injection though. ALso, does the car overheat at all? Are you sure the gauge works properly. this would also cause detonation.
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Old 09-22-2002, 05:39 PM
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If it's carbon build up you suspect, there's this stuff called Sea foam De-carbonizer that NAPA sells. It works really well. You can pour it down the PCV valve on fuel injected motors.
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