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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: Need some help with my 85.

Subject: Re: Need some help with my 85.
by Jeffvette on 2011/7/27 0:13:49

24 - VSS
34 - MAF Low
42 - EST
54 - Fuel pump Circuit low voltage

I would ignore the VSS code for know and work on the other three. Also ignore the MAF as a low unsteady idle will cause that.

I would check fuel pressure and make sure the pump is working correctly.
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