Yes, he is right I have a 92. So, did I mis-say this?! What is it MAP?!? 
MAF problem?!?
Thread Starter
Melting Slicks
Joined: Jul 2003
Posts: 3,215
Likes: 46
From: Pomfret, CT
Finalist 2020 C4 of the Year - Unmodified
MAF problem?!?
So, my car has been acting up……I got a code 43 and 64. Knock sensor and oxygen sensor codes. The car is very loud and is backfiring like crazy. It has no power either. Also, don’t know if it is related, but the ASR light is on. 
This only happens while driving. Idle sounds fine. So, my buddy brought his “professional” scanner over and he could not see anything. Anyway…long story short, we unplugged the MAF sensor and she ran much better. So, logical thinking would be change the MAF, have my car back. 
Does everyone agree with that or could we be missing something?
Assuming the MAF is the culprit what are my options? Should I get a factory replacement? Are there any other “budget minded” things to do when I am doing this? Is there a “performance” upgrade for the MAF….if so what other mods do I need to see the benefits?
Thanks in advance,
-Rick
This only happens while driving. Idle sounds fine. So, my buddy brought his “professional” scanner over and he could not see anything. Anyway…long story short, we unplugged the MAF sensor and she ran much better. So, logical thinking would be change the MAF, have my car back. Does everyone agree with that or could we be missing something?
Assuming the MAF is the culprit what are my options? Should I get a factory replacement? Are there any other “budget minded” things to do when I am doing this? Is there a “performance” upgrade for the MAF….if so what other mods do I need to see the benefits?
Thanks in advance,
-Rick
Racer
Joined: Jun 2006
Posts: 361
Likes: 6
When my MAF failed it threw no codes. Ran like cr*p, but going through the troubleshooting process unplugged the MAF and she ran great. I mean, she ran really good without it and I got better gas mileage too, strange. I bought a replacement from AutoZone, which failed after an hour, but returned it for another the same day and she's been fine since. I think it was like $80.00 with core exchange. Changed both relays for added insurance.
I have an '88.
I have an '88.
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
One of the tests for a bad MAF is to unplug it. The system then defaults to MAP and if it runs better, then the MAF is the problem. That's what a GM Service Tech told my son when he was having a recent back-firing, etc., problem.
Before buying another MAF I'd recommend you first spray clean yours and give it another try. Auto parts stores sell spray MAF cleaner - IIRC CRC is the brand name.
Most everything I read says not to fool with after-market MAFs, those supposedly a performance "up grade". Everything I've read says they don't interface well with the GM ECM/PCM.
If does turn out to be the MAF, I'd first hit the wrecking yards. That's what I did when my 86 MAF failed. I was able to test it on my engine right at the wrecking yard. $50 and ran fine for years and was still going strong when I sold the car.
Jake
Before buying another MAF I'd recommend you first spray clean yours and give it another try. Auto parts stores sell spray MAF cleaner - IIRC CRC is the brand name.
Most everything I read says not to fool with after-market MAFs, those supposedly a performance "up grade". Everything I've read says they don't interface well with the GM ECM/PCM.
If does turn out to be the MAF, I'd first hit the wrecking yards. That's what I did when my 86 MAF failed. I was able to test it on my engine right at the wrecking yard. $50 and ran fine for years and was still going strong when I sold the car.
Jake
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Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
Thread Starter
Melting Slicks
Joined: Jul 2003
Posts: 3,215
Likes: 46
From: Pomfret, CT
Finalist 2020 C4 of the Year - Unmodified
