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Print in friendly format Send this term to a friend  RPO
Regular Production Order. These are the codes that GM uses to identify options.

For example, LT1 is the RPO for the engine used from 1992-1996.
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Re: C4 acting up. What do you think?

Subject: Re: C4 acting up. What do you think?
by anesthes on 2009/4/3 17:38:51

Prom issue perhaps, becoming unseated. ECM going into limp mode. CCM losing connectivity to the ECM, maybe freaking out? Though that is not supposed to happen.

Also could be a power regulation issue, maybe the alt is junk. There is some voltage correction stuff in the bin that effects injector pulsewidth, that could account for the strange running condition and if the voltage drops your CCM could be malfunctioning.

-- Joe
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