3D-Aircrew

It seems to me I had this problem several months back and I changed the MAF relay and the burnoff relay and it was fixed.

Now it shows code 36 and the SES light comes on in about 2-5 seconds after start. The thing is it is running fine and hasn't lost MPG's for the last 1/2 tank of gas. I think it could be one of the relays again but I don't want to throw parts at it.

Thanks,
Robert

JrRifleCoach

Here's something to look for.
Fast forward to 2:00......

3D-Aircrew

I just now took a look at that little hose @2:00 and the hose is old and decrepit although I can't see all to tell if it's leaking and I think it's original.

Any idea on how to get in there to replace it?

kael

Various curses of a loud and hideous nature!! The actual problem is NOT the burn circuit, rather the ECM saying "Hey, burn circuit, you suck, your friend the sensor is saying garbage." ?!?

Well, I know what I'm gonna try shortly!! I already replaced the boot in the header thinking it might be leaking.

rblakeney

Install a quality battery cutoff switch on the negative battery post so that it's easy to simply reset the code. This works for me over several start cycles before the code is eventually set again. There have been tons of bright people work on this burn off code issue for years. I don't worry about it.

kael

I had a slightly different PVC problem, the hose to the valve cover. I didn't think a hose as hard as rock was a problem, replaced it thanks to this. *deep bow*
Didn't fix code 36, but did help some others, smoother idle, softer throttle on take off. Worth the $4!

Cliff Harris

There are several problems with this "solution". The main problem is that the code 36 test is done while the engine is OFF, so the vacuum doesn't enter into the equation.

This link has much more information on the code 36 problem and solution:

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

See post #32. The whole burnoff thing is in that post.

BlowerWorks

See my earlier explanation !!!!!!!!!

3D-Aircrew

So my car started to run bad and still has the code 36 ... low MPG 10.6.

After reading through the post you mentioned I subsequently found a post where you said the MAF burnoff relay has 2 orange wires. Indeed IAW the FSM the MAF Burnoff relay has what appears to be one orange wire connected to a jumper(orange?) and 2 Dark Blues and a black wire.

Well That's where I got my power relay and I'm pulling a code 36.

So last night I checked in the dark to see that NO there is not a MAF burnoff after shutdown. Then I switched the relays to the PROPER configuration and started it (after disconnecting the battery) No code 36 but code 33 and no burnoff after shutdown.

So is my problem actually a code 33 all along? What damage might have I done by having the power and burnoff relays swapped?

Feeling pretty puny right now.





IAW the FSM the top relay is the MAF Burnoff and the right one is the power ... but the wiring doesn't match.


So with the relays in proper position it does run better than yesterday although I don't know the MPG yet despite the code 33. Decided to disconnect the MAF to see if I can notice a difference and it definitely runs poorly without the MAF barely idling on its own and stalling sometimes ... but sets no code (other than 33 still) being disconnected. So I think the MAF is functioning. Time to troubleshoot the 33.

JrRifleCoach

Its also time to cleanup those grounds.

kael

Since the code jumped from one relay circuit to the other, points to relay or bad connection. Check the relay per FSM. While disconnected, check the connection tabs on the relay, make sure none are bent, they are clean, etc.

I don't know about the '86 relays, but on my '87, they are both the same. Memory is trying to tell me '86s aren't the same, but that's 60/40 being right.

3D-Aircrew

86 relays are completely different from each other other than the fact the connectors are the same.

3D-Aircrew

Well I decide to change the MAF power relay AGAIN - NAPA #AR227 (Echlin) and this cleared the code 33 and it runs much better.

Maybe I damaged it when I had them swapped or maybe these cars eat MAF relays.