Weird code 33

[Alfonso Gomez]

My 87 Coupe, auto tranny and the usual bolt-ons developed a code 33. The weird thing is that I took out the MAF sensor and cleaned it using throttle body cleaner. I sprayed it from 12 inches away so as not to damage the filaments. I air dried it and the filaments were (visually) OK. I also checked and cleaned the power relay and burn-off relay connectors and the MAF sensor connectors. When I start the engine, the car sounds like it has a hot cam, the idle is very rough and it misfires when I try to accelerate (in neutral). At this time the SES light is OFF. When the SES light turns ON, the missing dissapears, it accelerates smoothly and there are no apparent problems. Next time I start the engine, it idles very rough and misses badly until the SES light turns ON. Then everything is OK then: smooth idle and crisp throttle response. What is the matter with this car??? Any help would be appreciated.

 

[WhalePirot]

No Helm's manual? pg. 6-E3-A-42

Code 33 --> ECM has seen flow > 45grams/sec (above 2.2vdc) for 1 sec when:
1- engine is first started, OR 2 and 3, which don't apply.

First step is to clear the codes. Remove power to the ECM or > 10 seconds.

Restart and check if the code reappears.

Let us know if you need more.

 

[Alfonso Gomez]

Since the MAF sensor is only 2 years old, I suspected the relays. Went to the local WesternAuto store and purchased the 2 relays (burn-off & power are the same) for $12.44 each. Installed them with the battery disconnected and VOILA!!! No more SES light. Now have to check the IAC and set correctly the TPS since I have a slightly high idle.

Thank you for all your help.

 

[ratorto]

Why the need for turning off power when installing the relays?

Anyone know why this is necessary?
I didn't do it....did I burn them out or something?

 

[nyernga]

Anyone know why this is necessary?
I didn't do it....did I burn them out or something?

It clears any error codes that are stored..........