1986 Coupe ( All stock)

I have been fighting an error code 36 ( MAF sensor burn off relay) for over a month. I have replaced the MAF sensor twice. I have replaced the burn off relay and the power relay twice. I have replaced the pig tail on the MAF sensor. I still get the error code 36. To make it worse after I disconnect the battery and start the car no code. I have driven the car over 50 miles. When I stop the car and restart it I get the error 36. The performance and gas mileage are great.

Any solution for this problem.

Thank you

 

I've been fighting the same thing on my 87. I've gone through several relays, a new MAF sensor, and even a new ECM. Of course, I've checked every wire in the circuit, including cleaning the connector pins with Deoxit. I still throw a code about 50-75% of the time.......... Thinking about simply removing the "Service Engine Soon" light bulb and not worrying about it........

 

Have you confirmed you've the more recent PROM in the ECM? With all of the parts you mention replacing it seems you've obviously had more than the DTC 36. PROM is I'm quite sure dependent upon "iron head" or "aluminum head". What are the other codes you've had?

I assume you've got the FSM. Have you done the diagnostics as mentioned for the DTC?


Have you done all of the confirmations mentioned in the TSBs for the DTC and the related DTC? I believe there's maybe 3 TSBs and a PROM update specific.

 

The code 36 test is done when the ignition is switched to OFF. It won't show up until that happens. My recollection is that the test is not done unless the ECM is in closed loop mode. See this thread for a lot more information:

https://www.corvetteforum.com/forums...e-36-help.html

 

From my programmer Pat:

>>>Hi Greg,
I've posted on this topic in the past.
The only way to determine what is really going on is to log data during the burn off cycle. With an 86 car, this is problematic due to the 160 baud logging rate. I have never had success getting an 86 bin to log at 8192 baud, but users with Diacom have reported success, so it should be possible....I've tried many things without success, but maybe something is different in a real 86 car with 86 specific ecm...An 86 bin in my 88 wont allow 8192 baud logging....I've spent lots of time trying...
In order to properly diagnose, he would need to use an 87-88 or 89 bin and log at 8192 baud during the burn off cycle in order to see what the ecm is actually seeing at the analog input (a/d). So he would need a cable, laptop, and ability to swap bins with adaptor, ostrich or programmer, etc.

The unlimited airflow signal will respond to the burnoff and the value in gm/sec will reflect the voltage that the ecm actually sees. By referencing the MAF tables against the unlimited airflow value, you can deduce the observed voltage.

The burnoff code is set when the voltage falls outside of preset limits. Some MAFs simply do not output the expected voltage during burnoll. It is likely a maf specific issue, but never no if you've got a good one unless you can positively confirm via testing.

Assuming ecm, related wiring, power and burnoff relays and circuitry is intact and functioning properly, The fix is to either adjust the thresholds so that the actual voltage will be considered a pass, or disable the dtc. <<<<

Greg here again guys - so obviously me or any other "chip" burner guy can fix for you ! greg

 

I have Diacom, and it definitely goes into 8192 baud mode on my '86. I believe it would be possible to program TunerPro to do the switch.