Help! Where is the Map sensor located on a 1988 Corvette
Thread Starter
Racer
Joined: Jun 2002
Posts: 278
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From: Perry Ga
Help! Where is the Map sensor located on a 1988 Corvette
I got a code 33 yesterday, replaced the burnoff relays and everything was fine until today. Code 33 agian, thought to replace the Map sensor. I can't seem to find it. Like me it is problably staring me in the face. Any help would be alots of help. :yesnod:
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
Re: Help! Where is the Map sensor located on a 1988 Corvette (TALMADGE)
You don't have one. They're on Speed Density systems.
Be sure to clear the stored error code by disconnecting the power to the ECM for about 30 seconds. Then restart the engine and see if the error code recurs.
Jake
[Modified by JAKE, 3:25 PM 4/17/2004]
Be sure to clear the stored error code by disconnecting the power to the ECM for about 30 seconds. Then restart the engine and see if the error code recurs.
Jake
[Modified by JAKE, 3:25 PM 4/17/2004]
Team Owner
Joined: Sep 2001
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From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Re: Help! Where is the Map sensor located on a 1988 Corvette (TALMADGE)
Code 33 is a MAF sensor/relay problem. There is no MAP on 85-89.
If you have replaced both relays and reset the ECM by unplugging the battery, the problem is likely the MAF sensor itself.
If you have replaced both relays and reset the ECM by unplugging the battery, the problem is likely the MAF sensor itself.
Safety Car
Joined: Oct 2001
Posts: 4,763
Likes: 1
From: Connectivette
Re: Help! Where is the Map sensor located on a 1988 Corvette (TALMADGE)
My car was running very rough when when my MAF sensor was on it's way out. Do you have any friendly fello C4 members in your area that will let you swap MAF sensors to see if you get the same codes? Those suckers aren't cheap :cuss
Melting Slicks
Joined: Apr 2002
Posts: 2,118
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From: St. Charles, MO Route 66 Corvette Club
Re: Help! Where is the Map sensor located on a 1988 Corvette (chucks88)
If you have a friend with a scanner, you can detect a MAF going South. Another option is to take it to a repair facillty and have them perform the scan function for you. It may cost you a few bucks, but it is cheap considering the MAF sensor will cost you about $250.
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
Re: Help! Where is the Map sensor located on a 1988 Corvette (Sam Lam)
I did the same thing when I suspected my MAF was bad; I borrowed one off my buddy's 85 Vette and the engine ran normally again.
I bought a replacement for my 86 from a wrecking yard a few years ago for $50
Some of the 'F' bodies come with the same MAF so finding one shouldn't be too hard.
Jake
I bought a replacement for my 86 from a wrecking yard a few years ago for $50
Some of the 'F' bodies come with the same MAF so finding one shouldn't be too hard.
Jake
Thread Starter
Racer
Joined: Jun 2002
Posts: 278
Likes: 0
From: Perry Ga
Re: Help! Where is the Map sensor located on a 1988 Corvette (JAKE)
Thanks for all the advice, Funny how advance auto parts lists a Map sensor for a 88 when it doesn't have one. I have a friend that owns his own shop, I will see if he can narrow it down to the Maf sensor. Thanks for all of your help and keep on :steering:
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Instructor
Joined: Apr 2004
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From: Troy Ohio
Re: Help! Where is the Map sensor located on a 1988 Corvette (TALMADGE)
I had the same problem on my 1988 the code said it was the Maf. I tryed two new mafs and didnt fix it. I then tryed another maf that I knew was good Still no luck. Finally I replace the computer and fixed the problem. It runs great now and I am using the old maf. The computer was cheaper than the maf. ------------ Hope this helps
Race Director
Joined: Nov 2003
Posts: 12,220
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From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
Check for wiring diagram(s). Seems like one pin should carry either 5 or 12V. And, other should vary with rpm.
MAM makes a test kit for to help with the plug issue....http://www.mamotorworks.com/corvette?frame=3.878
Oh yeah...How about low voltage from the alternator/battery?
Last edited by GREGGPENN; Aug 24, 2012 at 11:49 PM.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Why do you think you have a MAF problem;do you have any engine codes showing?
http://www.chevythunder.com/maf_code_33.htm
http://www.chevythunder.com/maf_code_34.htm
http://www.chevythunder.com/maf_code_33.htm
http://www.chevythunder.com/maf_code_34.htm
Racer
Joined: Jun 2006
Posts: 361
Likes: 6
We had a guy bring his 87 in because it was running rough and he wanted us to take a look. He said a shop in Riverside had the car for two weeks and couldn't find the problem. It sounded like a MAF issue so that's where we started, plus it one of the easiest things to eliminate as a problem. We unplugged the MAF and the idle evened out so we began checking continuity between the power relay and sensor. There was no continuity between two of the wires. We found that the wire loom had made contact with the belt and cut the two wires. It took us 30 minutes max.
Take your time, follow the troubleshooting procedures and advice above and you'll find your problem.
Take your time, follow the troubleshooting procedures and advice above and you'll find your problem.
Cruising
Joined: May 2012
Posts: 13
Likes: 0
thanks everyone ,no codes showing. put an aftermarket MAF in for $56.00 in and that is the only thing i can think it could be. one day this 88 will run good and the next the miss reappears? am about fed up and ready to sell again... will take a pill and try again later THANKS !!!
3rd Gear
Joined: Dec 2017
Posts: 3
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There isnt one on 87 or 88
there isn't one on an 87 or 88 what code 33 comes up it's the MAF sensor or relays
3rd Gear
Joined: Dec 2017
Posts: 3
Likes: 0
There isnt one on 87 or 88
there isn't one on an 87 or 88 what code 33 comes up it's the MAF sensor or relays
3rd Gear
Joined: Dec 2017
Posts: 3
Likes: 0
There isnt one on 87 or 88
there isn't one on an 87 or 88 what code 33 comes up it's the MAF sens9or or relays
Team Owner
Joined: Sep 2003
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James Clancy
You've just posted to a thread that's several years old!! I'm sure you intended well but I'd think all posters prior to you have sorted their issues and moved on.
If you meant to ask a question just ask.
3 times the same what's up?
You've just posted to a thread that's several years old!! I'm sure you intended well but I'd think all posters prior to you have sorted their issues and moved on.
If you meant to ask a question just ask.
3 times the same what's up?
Last edited by WVZR-1; Dec 7, 2017 at 06:43 AM.