I have replaced the maf, and this did not fix the problem. The car does not seem to lose power when it throws the code, but it throws a code 33 and 34 when I drive it in the morning when it is cold outside, like 30-37 degrees outside, always happens when parked outside overnight and has thick ice on the window. Once I have driven the car for a while I can restart the car and get no code, and the code very rarely comes on at any other time, like 5-6 times a year if not cold. I rarely drive the car when it is cold outside. So I don’t get the code very often. I was doing some searching and was thinking it was probably the relays (burn off, and maf power) But was hoping for confirmation. Or thought of what else it may be. Also I have a 180 degree thermostat with 2 1/16 bypass holes in it to help water flow so it takes bout 10 min to fully warm up. Takes bout 2 min to throw the codes. Thanks for the help

 

bump

 

The thermostat should have nothing whatsoever to do with it, although it may cause a few other nuisance problems.

A simultaneous '33' and '34' almost certainly points to MAF power or connection problems in the MAF circuit (includign the ECM). The fact that it reports both high and low readings without reporting a problem with a lost TPS signal doesn't leave much.

It is also possible that the MAF burn off relay is inadvertently powering the MAF burn off cycle while the engine is running, causing the high reading.

 

i have a 85 iroc and the maf went bad and replace it with a granatelli hi flow and now at wide open throttle i get a check engine light with a code 33 an 43. has anyone encounter this problem before. if so how how can you fix it or the ecu chip has to be recalibrated. need help open to any suggestions thanks.

 

i bet its your MAF burnoff relay. try that. its located on the firewall on the drivers side in the very corner of the fender.

 

before i changed the MAF i had already checked the burn off module because i did not want to spend money on that module very expensive. the code 33 is high voltage to the MAF and the 43 is ESC module from what i have been told.
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85 came with a burn off module not a relay it was the only year.

 

Thanks for the reply's, I will buy the relays when i get payed on the 5'th. Thay are about 40$ for both power and burn off right?

 

I have the EXACT same problem.. only when the car is cold... Where are the relays you guys speak off... The drivers side cowl? Anybody have a good pic?
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Let me know if that helps as I am all about replacing relays to fix this nuisance...

Ryan