I finally got some data logging accomplished last nite. I always had a feeling my car was rich....and the ECM852 proved it. As soon as I started my car the BLM was at 108 and stuck in cell 4. Then INT went as low as 94 and as high as 128(only under full throttle) The BLM would go to 128 under full throttle as well. Im assuming it does that because the ECM doesnt use sensor date under full throttle, correct?? All but two of my injectors are not in spec according to resistance taken by the multi-meter. What else can I check on my logged file to see what the problem "may" be??? the TPS is around .63 but doesnt the ECM zero it out each start?? My car is totally stock....just a 91 L98 350. I can post my log file if somebody would like to take a look and see something Im missing. Im still a rookie at this, so some light at the end of the tunnel would be greatly appreciated. Thanks in advance.

 

INT and BLMs will go to 128 at full throttle. I believe The ECM ignores the O2 sensor at WOT and relies on Power Enrichment calibration data to alter the A/F ratio.

As far as under other operating conditions....

Go ahead and post the log file. But other suggestions are as follows:

Are the descrepant injectors on the same side as the O2 sensor? This is where it helps to have two O2s (one on each side) which you can switch back and forth on. If they are on the same side, pull one off with the engine idling and see what the BLM's do. If they go back up toward 128, then you have a faulty injector. Do you feel any sort of cylinder misfire?

Are you getting any codes?

Check for proper operation of your charcoal cannister purge- that is, solenoid functioning properly, vent lines are not blocked, charcoal filter is clean, PCV valve, etc. Sometimes simple things like that are often the solution. I just got through solving a misfire problem that was apparently due to a blocked vent line from the fuel tank. It too was causing a bad smell. I'm guessing that the fuel vapors were getting where they weren't supposed to and wreaking havoc with the sensors.

 

Here is the log file....I hope you can find something I missed.

 

Here we go...finally...click on the link....sorry bout that.





right click save as....

 

Hmmm... don't see anything out of the ordinary.

I'd go back and do the checks I suggested. It might be some sort of mechanical malfunction someplace.