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 Chevy B7 w/ 3126 Cat. Actuation Pressure Problem
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bwest
Administrator

United States
2356 Posts

Posted - 02/27/2014 :  08:37:29 AM  Show Profile  Reply with Quote
I have rebuilt a 3126 again and I have a check engine light on but didn't before the OH. There are three active codes. One is Inj. Act. Pressure System Fault, Second is Inj, Act. Pressure Sig. Erratic, & lastly Inj. Act. Pressure Output Fault. I have checked connections and can't see anything wrong.
Any ideas?

Mechan1c
Top Member

USA
709 Posts

Posted - 02/27/2014 :  09:47:59 AM  Show Profile  Reply with Quote
Normally that group of problems leads to either an IAP sensor, or the valve. Do you have an old sensor laying around or one to swap? I wonder if something is hung up in the shuttle part of the valve...they are pretty sensitive to old engine oil viscosity, but I'm guessing this has brand new oil.
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bwest
Administrator

United States
2356 Posts

Posted - 02/28/2014 :  05:50:33 AM  Show Profile  Reply with Quote
Yes, it has break in oil at this time. I had just put a pressure sensor on it before the OH.

Bryan
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