Believe MAF is Fried, Symptoms Sound Right?

Swarzkopf1 · 08-30-2004, 01:09 PM

I have a 95 GT. The motor is stock with a cat-back exhaust and an adjustable fuel pressure regulator. The MAF is stock.

The car will drive normally sometimes; other times it feels like its running rich, and other times it spark knocks. Sometimes, it will literally change its demeanor during a drive; going from bogging to spark knocking and back to bogging, ect.

When the car is bogging or knocking, its registering a check engine light.

I've found that when I disconnect the MAF, the car stops varying between rich and lean and runs fairly well, much better. This leads me to believe that the MAF is the culprit- though I've heard that 94-95 GTs are prone to spark knock.

I've got a Pro-M 75mm on order right now, and am hoping that this cures the problem.

Any input? Do these symptoms sound right for a malfunctioning MAF? Thanks in advance.

88fivepointoh · 08-30-2004, 01:16 PM

If it runs pretty much flawless with the mass air out of the picture, then the sensor is gone. I wouldn't rule out a bad TFI module which can give similar symptoms, as would a bad ECM, but i would guess the mass air is shot.

Swarzkopf1 · 08-30-2004, 01:21 PM

With the MAF unplugged, the car will hesistate bigtime from a stop from idle speed when I initially hit the gas, but once rolling it runs perfectly. If I keep it above my 600 rpm idle with some pedal at a stop, it won't hesitate at all and runs perfectly the whole time.

ECM= my EEC-IV? Carparts.com has EEC-IVs for $160, was thinking that would be my next step if the MAF didn't cure my woes.

88fivepointoh · 08-30-2004, 01:50 PM

Rewplace your mass air.. Get a after market one, Pro-M or granettelli... Most likely your mass air is shot and it would hesitate if its unplugged..

Swarzkopf1 · 08-30-2004, 02:03 PM

Quote:

I've got a Pro-M 75mm on order right now, and am hoping that this cures the problem.

LOL

Thanks for the feedback.

88fivepointoh · 08-30-2004, 02:04 PM

there you go.. good choice.. In the mean time, take your TFI module out and have it tested at autozone.. its free...

08-30-2004, 01:09 PM	#1
Swarzkopf1 Registered Member Join Date: Jul 2004 Posts: 18	Believe MAF is Fried, Symptoms Sound Right? I have a 95 GT. The motor is stock with a cat-back exhaust and an adjustable fuel pressure regulator. The MAF is stock. The car will drive normally sometimes; other times it feels like its running rich, and other times it spark knocks. Sometimes, it will literally change its demeanor during a drive; going from bogging to spark knocking and back to bogging, ect. When the car is bogging or knocking, its registering a check engine light. I've found that when I disconnect the MAF, the car stops varying between rich and lean and runs fairly well, much better. This leads me to believe that the MAF is the culprit- though I've heard that 94-95 GTs are prone to spark knock. I've got a Pro-M 75mm on order right now, and am hoping that this cures the problem. Any input? Do these symptoms sound right for a malfunctioning MAF? Thanks in advance.

08-30-2004, 01:21 PM	#3
Swarzkopf1 Registered Member Join Date: Jul 2004 Posts: 18	!! With the MAF unplugged, the car will hesistate bigtime from a stop from idle speed when I initially hit the gas, but once rolling it runs perfectly. If I keep it above my 600 rpm idle with some pedal at a stop, it won't hesitate at all and runs perfectly the whole time. ECM= my EEC-IV? Carparts.com has EEC-IVs for $160, was thinking that would be my next step if the MAF didn't cure my woes.

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08-30-2004, 01:16 PM	#2
88fivepointoh Registered Member Join Date: Aug 2002 Location: Rochester Posts: 553	If it runs pretty much flawless with the mass air out of the picture, then the sensor is gone. I wouldn't rule out a bad TFI module which can give similar symptoms, as would a bad ECM, but i would guess the mass air is shot.

08-30-2004, 01:50 PM	#4
88fivepointoh Registered Member Join Date: Aug 2002 Location: Rochester Posts: 553	Rewplace your mass air.. Get a after market one, Pro-M or granettelli... Most likely your mass air is shot and it would hesitate if its unplugged..

08-30-2004, 02:04 PM	#6
88fivepointoh Registered Member Join Date: Aug 2002 Location: Rochester Posts: 553	there you go.. good choice.. In the mean time, take your TFI module out and have it tested at autozone.. its free...