Mass Air Flow Meter problems....
Thread Starter
Intermediate
Joined: May 2011
Posts: 47
Likes: 0
From: Mackay Queensland
Mass Air Flow Meter problems....
I have an 89 Corvette, I haven’t had the car very long and I am trying iron out a few problems... One being the Mass Air Flow meter. I discovered recently that the meter is disconnected. The car is running a little rough from time to time so I thought by connecting back it would it would make an improvement... Quite the opposite, I could barely get it started and it wouldn’t even idle.
I have read about other meters that have an effect on performance so my concern here is if I replace the MAF meter and the relays will this fix the problems I am having and also make the “Service Engine Soon” light shut off??
Is there anyone who has had a similar experience? Also I am in Australia so I will have to by the parts online so I need to know where is a good online shop for parts.
Thanks
I have read about other meters that have an effect on performance so my concern here is if I replace the MAF meter and the relays will this fix the problems I am having and also make the “Service Engine Soon” light shut off??
Is there anyone who has had a similar experience? Also I am in Australia so I will have to by the parts online so I need to know where is a good online shop for parts.
Thanks
Tech Contributor
Joined: Oct 2008
Posts: 3,729
Likes: 190
From: Custer, WI
You're right, it is more than likely to be a Reman'd then. Being down in australia maybe you would just order both relays and the sensor itself and be done with it, that way you wouldn't have to wait for a new MAF is you replaced the relays and that didn't do the trick.
Team Owner
Joined: Jan 2003
Posts: 20,304
Likes: 240
From: Summerland B.C. Canada
MAF code diagnostics from my 86 FSM
http://members.shaw.ca/corvette86/Code%2033.pdf
http://members.shaw.ca/corvette86/Code%2034.pdf
http://members.shaw.ca/corvette86/Code%2036.pdf
How to retrieve ECM codes
http://www.corvettephotographs.com/c4vettes/codes.htm
Drifting
Joined: Oct 2006
Posts: 1,934
Likes: 3
From: Citrus Heights California
If you need the sensor. I have a new one like this in the box. http://www.mamotorworks.com/corvette?frame=3.7287
PM sent
PM sent
Thread Starter
Intermediate
Joined: May 2011
Posts: 47
Likes: 0
From: Mackay Queensland
You're right, it is more than likely to be a Reman'd then. Being down in australia maybe you would just order both relays and the sensor itself and be done with it, that way you wouldn't have to wait for a new MAF is you replaced the relays and that didn't do the trick.
Thread Starter
Intermediate
Joined: May 2011
Posts: 47
Likes: 0
From: Mackay Queensland
The relays are on the firewall, not sure if they moved them on your conversion, but I doubt it.
MAF code diagnostics from my 86 FSM
http://members.shaw.ca/corvette86/Code%2033.pdf
http://members.shaw.ca/corvette86/Code%2034.pdf
http://members.shaw.ca/corvette86/Code%2036.pdf
How to retrieve ECM codes
http://www.corvettephotographs.com/c4vettes/codes.htm
MAF code diagnostics from my 86 FSM
http://members.shaw.ca/corvette86/Code%2033.pdf
http://members.shaw.ca/corvette86/Code%2034.pdf
http://members.shaw.ca/corvette86/Code%2036.pdf
How to retrieve ECM codes
http://www.corvettephotographs.com/c4vettes/codes.htm
Thanks for the info Agent 86.... I will need some time to go through it.
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Advanced
Joined: Mar 2011
Posts: 55
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hi i was having issues from hell as well code 33 fuel pump running rich etc etc bought a new boche 1200 map and well still wont start soooo im going to throw a bowl and carb and be done with the whole thing so i have a new boch map sensor if your intereted
Thread Starter
Intermediate
Joined: May 2011
Posts: 47
Likes: 0
From: Mackay Queensland
Tony A... It will take a while as I have source the parts from the US... But yeah I will keep you posted.
I really hope the MAF and relays will fix the problem as it is not running the best and I think it is running a bit rich as the exhaust is black on the pipes. It is difficult to start especially when hot.
Fingers crossed....
I really hope the MAF and relays will fix the problem as it is not running the best and I think it is running a bit rich as the exhaust is black on the pipes. It is difficult to start especially when hot.
Fingers crossed....
Racer
Joined: Apr 2011
Posts: 296
Likes: 1
From: Tipp City Ohio
Tony A... It will take a while as I have source the parts from the US... But yeah I will keep you posted.
I really hope the MAF and relays will fix the problem as it is not running the best and I think it is running a bit rich as the exhaust is black on the pipes. It is difficult to start especially when hot.
Fingers crossed....
I really hope the MAF and relays will fix the problem as it is not running the best and I think it is running a bit rich as the exhaust is black on the pipes. It is difficult to start especially when hot.
Fingers crossed....
http://forums.corvetteforum.com/c4-p...tc-88-car.html
Thread Starter
Intermediate
Joined: May 2011
Posts: 47
Likes: 0
From: Mackay Queensland
UPDATE...
I got my new / second hand MAF... I also have ordered parts from the US (relays)...
I didn’t wait for the other parts... Got home early from work and in my inpatients installed the MAF and it works fine and it seems to run a little smoother than having the old MAF disconnected. I could barely get it to start with the old one connected up as it was faulty. Strange though it took a little time to settle in but when it did, it starts hot easy as and the biggest of all at the moment the "Service Engine Soon" light turned off. So cool.... It idles a little rough, so I guess I just need a tune as the previous owner didn’t do much to look after it. So hopefully all is good for now.
I got my new / second hand MAF... I also have ordered parts from the US (relays)...
I didn’t wait for the other parts... Got home early from work and in my inpatients installed the MAF and it works fine and it seems to run a little smoother than having the old MAF disconnected. I could barely get it to start with the old one connected up as it was faulty. Strange though it took a little time to settle in but when it did, it starts hot easy as and the biggest of all at the moment the "Service Engine Soon" light turned off. So cool.... It idles a little rough, so I guess I just need a tune as the previous owner didn’t do much to look after it. So hopefully all is good for now.
Le Mans Master
Joined: Jun 2006
Posts: 5,642
Likes: 5
From: One day you're a Comet...the next day you're dust... Arkansas
UPDATE...
I got my new / second hand MAF... I also have ordered parts from the US (relays)...
I didn’t wait for the other parts... Got home early from work and in my inpatients installed the MAF and it works fine and it seems to run a little smoother than having the old MAF disconnected. I could barely get it to start with the old one connected up as it was faulty. Strange though it took a little time to settle in but when it did, it starts hot easy as and the biggest of all at the moment the "Service Engine Soon" light turned off. So cool.... It idles a little rough, so I guess I just need a tune as the previous owner didn’t do much to look after it. So hopefully all is good for now.
I got my new / second hand MAF... I also have ordered parts from the US (relays)...
I didn’t wait for the other parts... Got home early from work and in my inpatients installed the MAF and it works fine and it seems to run a little smoother than having the old MAF disconnected. I could barely get it to start with the old one connected up as it was faulty. Strange though it took a little time to settle in but when it did, it starts hot easy as and the biggest of all at the moment the "Service Engine Soon" light turned off. So cool.... It idles a little rough, so I guess I just need a tune as the previous owner didn’t do much to look after it. So hopefully all is good for now.
3rd Gear
Joined: Jul 2010
Posts: 3
Likes: 0
From: Birmingham AL
MAF problems on 88 c4
Just started driving a garage kept 35th anniversary vette (88k) and has had the same problem since started driving. When going into a "limp mode" (service light appears) the car will barely make it up hills without playing with the pedal. Letting off the gas gently gets you going, pedal down and the car makes popping sound and does't go anywhere. Also transmission feels jumpy and has hard time passing through gears. Forums tell me MAF and relays. Does this sound like the right match for my problem?
All comments are much appreciated and help make this site the best tool for the job!
All comments are much appreciated and help make this site the best tool for the job!
Racer
Joined: Apr 2011
Posts: 296
Likes: 1
From: Tipp City Ohio
Just started driving a garage kept 35th anniversary vette (88k) and has had the same problem since started driving. When going into a "limp mode" (service light appears) the car will barely make it up hills without playing with the pedal. Letting off the gas gently gets you going, pedal down and the car makes popping sound and does't go anywhere. Also transmission feels jumpy and has hard time passing through gears. Forums tell me MAF and relays. Does this sound like the right match for my problem?
All comments are much appreciated and help make this site the best tool for the job!
All comments are much appreciated and help make this site the best tool for the job!
Does your car run ok for like 5-10 mins after cold start then starts acting up? If so, check those items.
Last edited by Tony A.; Jul 26, 2011 at 07:57 AM.
3rd Gear
Joined: Jul 2010
Posts: 3
Likes: 0
From: Birmingham AL
Reply to Tony A.
Yes! runs great cold for the first couple of min then if you hit that pedal the wrong way it goes into that mode. If you have any tips or suggestions for me, lay them on me. Much appreciated.
Cruising
Joined: Aug 2017
Posts: 12
Likes: 0
Maf code
Hay I have an 86 which is running so rough it can’t even do a burnout. My dad is convinced it’s a vacuum leak but I can’t find it. We unplugged the maf to check it and the vette would idle normally, but it’d throw a code. Then when we plug it back in the code goes away. Is it possible that the maf is still defective?
