Electrical Codes

Mouse91gt

New Member
Mar 27, 2023
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91' all original equipment. Pulled the codes due to Check engine light being on. Found the following: (Key on only)- code 22 - MAP/BAP out of test range.
Engine running - 21 ECT out of test range, 41 HEGO system lean right, 91 system lean left, 33 EGR valve open not detected.

I do not have any testing info for these sensors. I'm wondering if code 22 could be the leading cause to all the other codes?

Where should I start?

How do I clear the codes?

Mouse91gt
 
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Everything is pointing to a vacuum leak. There's a notorious one straight back from the distributor under the intake plenum. You clear codes by disconnecting the negative battery cable for a couple minutes.
 
This should tell you how to clear codes.
I agree, you have a vacuum leak.
 
This should tell you how to clear codes.
I agree, you have a vacuum leak.
Thanks for your assistance.