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Print in friendly format Send this term to a friend  Regular Production Order
Commonly known as RPO. 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: High HC emissions -- redux

Subject: Re: High HC emissions -- redux
by josephf31 on 2013/7/29 23:47:34

Quote:

Matatk wrote:
Also, since ignition problems can cause unburnt fuel problems, have you ever changed the cap and rotor or plug wires?


Cap rotor and plug wires are all less than 5K old.

Had an exhaust leak (at back of cat) fixed it when cat replaced.

Tried the "guaranteed to pass" stuff before all it is is injector cleaner. I did put a can of Seafoam in the fuel tank and a bottle of Heet figured it couldn't hurt.

CTS?
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