Valve cover gaskets

[AntleredRuin]

So I changed my VCGs yesterday. Was pretty uneventful except for the very end.
I check wires, hoses, etc. Put the negative battery cable back on, and crank her up.
Starts up just fine, but I quickly realize something is wrong. Used my Torque app to monitor temps as it warmed up, and as it did, the idle lowered too far. Sat around 480-500 in park, and near stalled in gear unless I gave it gas.
Seemed like an airflow issue, and then a CEL came on. Checked it with Torque, and sure enough, the MAF.
Weird thing is, I cleaned it with MAF cleaner when the air intake was apart. Hosed down, then let air dry, as I'd done like 3 other times since I bought this thing.
So I removed it and cleaned it again, but same thing.

So I had a spare (non-OEM eBay) MAF lying around from a previous issue a few years ago. Plugged that in, and instantly the CEL went away, and the idle returned fine.

So apparently cleaning the MAF broke it? I used the same MAF spray I'd used for years. Literally, the same bottle. Does the spray go bad? I don't think I saw an expiration date.

Anyways, luckily I never returned the eBay MAF. $14 well spent, 2 years later.

I'll grab some new spray next time I'm at Walmart and try the original MAF again soon.

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[Arnezie]

I’ve literally used the same can of MAF cleaner that is about 20 years old and never had any issues.


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[CB3G_GM]

What was the MAF code?

 

[AntleredRuin]

I think it was PO100.
I didn't save the log in Torque, so it's already cleared.

May have also been a vacuum issue, but all I did was disconnect the intake hose from the air box and remove the box to replace the MAF. Don't really see another 'point of failure' there.

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