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Old 06-10-2021, 11:34 PM   #51
Scooby Newbie
Member#: 510671
Join Date: Jan 2020
Chapter/Region: SCIC
Location: California
2006 WRX


Originally Posted by Bad Noodle View Post
Old Thread update:

The reason behind this symptom was a weak/broken ground in my stock wiring harness. When I grounded the maf with a wire or the maf housing touched something metal, that provided the extra ground needed but caused a variation in the signal going to the ecu.

I tore apart the stock harness and built a new one from scratch ensuring best possible connections throughout. This completely eliminated the symptoms. I can ground/unground the maf housing all day long and it doesn't change the behavior of the car in any perceivable way..

my car has a hunting AFR at idle and stumbling at low load and I just now found I have a broken ground to the shielding for some sensors. I will post an update once I fix my wiring.
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