1986 L98

code 36, SES light will go out and stay out when I reset it.Did over 200 mi.,comes back on at restart.Runs good with or without code.SES light bugs me. Any ideas?

coupeguy2001

code 36 is burn-off circuit.
I would try replacing the burn-off relay, and see what happens. Usually they tell you to replace this relay if you change the mass air flow sensor.
Try changing it now. They are about $11.

FSM says clear the codes then run the engine till the temp is up to at least 180 degrees, turn engine off, wait 20 seconds, and restart the engine, check to see if the check engine light comes back on.
Check the blue wire on the burnoff relay for an open or short to ground. If the wire is ok, the black wire imay be open, (not connected anywhere)
Check the orange wires of the mas air burn-off relay for 12 volts, If 12 volts present,

then disconnect the mass air sensor, and ground the black wire on D12 of the engine computer and see if the light comes on.

If it does, check the red wire on the mass air flow sensor plug for 12 volts.

If there is no volts, check for a short to 12 volts on the black wire. If all is good, replace engine computer.

1986 L98

Thank's,since my post I found more info and down loaded/copied. It's the same direction you were sending me.Thank you, I'll let you know.

1986 L98

I must be missing something.Performed trouble shooting chart,will run again today.Does anyone have the AC Delco #'s for the burn-off and power relays? I've read that they were different,have not been able to find that info.The ones that were on the car were the same p/n's.,they checked good via the chart.I'll give the local dealer a call

AGENT 86

Model and Year: 1986-87 CAMARO AND CORVETTE EQUIPPED
WITH 5.0L OR 5.7L PFI ENGINES
TO: ALL CHEVROLET DEALERS

Some vehicles equipped with 5.0L or 5.7L port fuel injected engines may experience "Service Engine Soon" light with some combination of codes 33, 34 and/or 36 stored. This bulletin summarizes diagnostic procedures to be used in trouble shooting these codes.

All 1986 model year vehicles should be updated to the latest service PROM per bulletins: 86-162, section 6E Corvette or 86-194, section 6E, Camaro and checked for "Service Engine Soon" light reset prior to further diagnosis. In the case of 1986-87 Camaro or 1986 Corvette the MAF power relay should be checked to assure that it is part number 10067925. If it is not, then it should be replaced with part number 10067925. Please do not substitute.

Diagnosis

CODE 33 (MAF SENSOR VOLTAGE HIGH)

Inspect to determine that part number 10067925 relay has not inadvertently been installed as a burnoff relay or incorrectly connected as a burnoff relay. (reference bulletin 86-152, section 6E).
NOTICE: SOME SERVICE PARTS BOOKS REFLECT THIS INCORRECT USAGE.

For proper relay parts usages, please refer to the relay usage chart provided at the end of this bulletin. No substitutions should be made.

With the engine fully warmed up and operating in closed loop, check the airflow at 2000 RPM in neutral using a Tech 1 or equivalent scanner capable of testing air flow. If it is below 16.0 gm/sec for a 5.0L or below 10.0 gm/sec for a 5.7L engine and the block learn value is greater than 130, replace the MAF sensor.
If code 33 still resets, refer to section 6E of the appropriate service manual for further diagnostics.

CODE 34 (MAF SENSOR VOLTAGE LOW)

Inspect the plenum side of the throttle blades for deposits. If even a small amount of deposits are present, clean the throttle body per bulletin 87-100, section 6E.
Thoroughly inspect the vehicle for sources of air entering the engine without passing through the MAF sensor. Specifically, look for a cracked, cut or loose duct between the air meter and the throttle body, poor inlet runner to plenum or manifold sealing, a split PCV hose or any type of vacuum leak. A large quantity of air does not necessarily have to be involved. If any leaks are found, repair the condition, clear the codes and check if the code resets.
Check resistance of the MAF power relay contacts per bulletin 87-99, section 6E. The resistance should be less than 1 ohm across closed contacts. If the resistance is greater than 1 ohm replace the relay.
Check the minimum air rate and compare to specifications found in bulletin 87-100, section 6E. If the air rate is below specifications, please reset by connecting a vacuum gauge to port A on the throttle body, increasing the air rate by turning the minimum air screw until one inch of vacuum appears on the gauge and then reducing the minimum air setting by one half turn of the screw.
If code 34 still resets, refer to section 6E of the appropriate service manual for further diagnostics.

CODE 36 (MAF BURNOFF)

Inspect to verify that the MAF power and burnoff relays currently on the vehicle agree with the usage chart provided at the end of this bulletin.
Check the relays for proper function per bulletin 87-99, section 6E. Also check for PCV plugged condition per the same bulletin.
Check all electrical connections carefully.
If code 36 still resets, refer to section 6E of the appropriate service manual for further diagnostics.

RELAY USAGE CHART

YEAR MODEL POWER RELAY BURNOFF RELAY
86 Corvette 10067925 10094701
86-87 Camaro 10067925 10094701
87 Corvette 14089936 14089936

pmihaltian

1986 MAF burn-off relay @ $17:

http://www.ecklerscorvette.com/corve...elay-1986.html

1986 L98

Awesome!