Here's my Q..... I am getting code 33 and have replaced all the maf relays, and the sensor.... I checked the TPS and all is good with it set to .60v.....

Symptoms: The car starts right up, then stumbled badly and almost stalls for a few seconds then the SES comes on and the rpms will rise and stays running..... The car runs real good overall, but I can really feel it come to life around 45-55 mph when getting on it....

Here is the data I pulled off it with ECM852.

http://bellsouthpwp.net/t/r/trwssb/...es/GM010402.CSV

I aslo have a couple more logs here and will post a couple more logs tonight at WOT getting on the interstate....

I just want to know if everything looks good from a data standpoint. Or what looks bad and needs to be adjusted...
I am just getting into this so please be patient.

Thanks,
Tim

 

Well judging by your logs, your blms are 109-116 which means you are really rich.

From what I understand, when your SES light is on, the computer adds more fuel to keep you from being lean, so that is nihl.



Check out that thread

https://www.thirdgen.org/techbb2/sho...&highlight=maf

make sure you read it all, because I recall a lack of info in one of that steps that was later remedied.

That will diagnose code 33.

If everything still checks out. Check your fuel pressure, check for vacuum leaks aswell (if you have a vacuum leak, air will be sucked into the engine causing a lean condition because the MAF says X is coming into the engine and what the engine is seeing is X + leaking in air.

 

Thanks, I'll check that out..... In the mean time here are the logs I made today with the engine off just starting the car up.

Here

Thanks again,
Tim

 

id be checking for a bad ground in the wiring harness( seen that alot ) as well as a bad o2 sensor. if the o2 sensor is showing lean alot the ecm will throw a code 33 low maf and it will do it all the time. thats why grounds are critical.

 

I ordered a 87 Camaro manual (Helms) off ebay.... I hear it has a more detailed troubleshooting guide for ECM codes....

I hope it will be here today.... I will post back with my results....

Tim