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Discussion Starter · #1 ·
Here's a question for you techies out there:

'95 D90, rimmer supercharger. (OBD 1)

I had to store it for about 6 months and now I'm getting a check engine light with code 44 (lambda sensor A - Left bank).

Also, I have a mixture gauge and it's telling me the rig is running rich all the time.

And.. the MAF is reading a fixed voltage of 1.6 volts no matter what the air flow.

So... Can a bad O2 sensor cause a fixed reading on the MAF?

Anyone messed with this before?

-John
 

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When the light comes on it goes into open loop and I believe on pre-GEMs trucks this fixes the MAF reading.

Try swapping O2s left to right and see what code you get.

Ron
 

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Discussion Starter · #3 ·
aha.. didn't know that about the MAF reading. I suspected there was something like this, but wasn't sure.

Always learning something new about these beasts..

I'll try the swap and see what happens. I have new ones too if they are dead.

-John
 
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