1985 MAF burnoff Module
Thread Starter
4th Gear
Joined: Oct 2022
Posts: 4
Likes: 0
1985 MAF burnoff Module
I am trying to understand how this relay works on a 1985 Corvette. I have a rough idle and hesitation under throttle. In my service manual it gives me a tree to follow to test the maf. When testing for ground (Car running and not running) Im only able to get my test light to light up when I hold the relay (I think thats what its called) on the circuit board of the MAF burnoff module. It looks like a small box maybe 1 inch around if that. There is a spring on the side and a tab that moves, when I hold that tab in , I am getting power to the ground of the maf connector but once I let go it holds the closed position for around 5 seconds then clicks back open and im no longer getting ground to the connector. Would love some information on how this is supposed to work and if this could be causing a idle problem by not supplying power to the maf sensor. Thank you, this is also my first post on the forum so let me know if there is a better thread for this information.
Racer
Joined: Jun 2001
Posts: 377
Likes: 10
From: Chicago IL
I might have an image of the burn off schematic somewhere. I know there have been old threads on troubleshooting the 85 only burnoff module. I will post if I can find. However, my guess is your idle / hesitation issues are fuel system related.
My car did the same things and I had issues throughout the system. Leaking injectors..ruptured fuel pulsator in tank (which I bypassed with fuel hose). Old dirty filter. Etc. I would do some pressure testing to see what is going on before digging in the MAF. Also, If you drive with the MAF unplugged, does the car perform differently?
My car did the same things and I had issues throughout the system. Leaking injectors..ruptured fuel pulsator in tank (which I bypassed with fuel hose). Old dirty filter. Etc. I would do some pressure testing to see what is going on before digging in the MAF. Also, If you drive with the MAF unplugged, does the car perform differently?
Thread Starter
4th Gear
Joined: Oct 2022
Posts: 4
Likes: 0
I might have an image of the burn off schematic somewhere. I know there have been old threads on troubleshooting the 85 only burnoff module. I will post if I can find. However, my guess is your idle / hesitation issues are fuel system related.
My car did the same things and I had issues throughout the system. Leaking injectors..ruptured fuel pulsator in tank (which I bypassed with fuel hose). Old dirty filter. Etc. I would do some pressure testing to see what is going on before digging in the MAF. Also, If you drive with the MAF unplugged, does the car perform differently?
My car did the same things and I had issues throughout the system. Leaking injectors..ruptured fuel pulsator in tank (which I bypassed with fuel hose). Old dirty filter. Etc. I would do some pressure testing to see what is going on before digging in the MAF. Also, If you drive with the MAF unplugged, does the car perform differently?
Ill have to test that with it unplugged but at idle in the driveway it idles the same unplugged or plugged. Waiting to get a fuel pressure tester then ill go from there thank you.
