needs help with backfiring

Hethj7 · 01-29-2006, 10:38 PM

It could be that a fuel injector is bad. I had the same thing happen with my 90, but it usually happened under load. The dealers have some way of flow testing the injectors without major work (they only charged me an hour of labor to do it). It was never a loud backfire, but it was a popping noise coming from the exhaust.

Hozer 88GTConv · 01-30-2006, 08:46 PM

An Actron CP9015 code scanner can help you out.
In addition to the Key On Engine On test, you can further diagnose a problem by running the cylinder balance test(this tests each injector individually while the car is running and will tell you if it is malfunctioning).

I have become a big believer in this diagnostic tool. It doesn't always tell you everything, but it sure beats guessing,

good luck...it's $30 at Sears or any parts store...

01-29-2006, 10:38 PM	#1
Hethj7 Mizzou Tigers Join Date: Apr 1999 Location: weston, MO United States Posts: 1,455	Re: needs help with backfiring It could be that a fuel injector is bad. I had the same thing happen with my 90, but it usually happened under load. The dealers have some way of flow testing the injectors without major work (they only charged me an hour of labor to do it). It was never a loud backfire, but it was a popping noise coming from the exhaust. __________________ 2006 Mustang GT 1990 LX GT-40 motor 262 horsepower, 307ft-lbs (sold but forever loved) 1998 Contour SVT Rice Haters Club Member #244

01-30-2006, 08:46 PM	#2
Hozer 88GTConv Registered Member Join Date: Feb 2002 Location: Jacksonville, FL Posts: 706	Re: needs help with backfiring An Actron CP9015 code scanner can help you out. In addition to the Key On Engine On test, you can further diagnose a problem by running the cylinder balance test(this tests each injector individually while the car is running and will tell you if it is malfunctioning). I have become a big believer in this diagnostic tool. It doesn't always tell you everything, but it sure beats guessing, good luck...it's $30 at Sears or any parts store... __________________ 1988 GT Convertible 331 10:1 TW heads, GT-40 intake, MSD, TRW flattops, B Cam w/ 1.7's, MAC exhaust, 24's, 70 TB, 76 MAF, 3.73's, Pro 5.0, Koni's, Anderson PMS, Wideband 02, yatta, yatta... One week with new motor, two speeding tickets...joy

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