Re: 92 GMC Fails Emmissions

Posted by Allan in NE on July 06, 2005 at 06:32:25 from (148.78.243.24):

In Reply to: 92 GMC Fails Emmissions posted by Farmer Paul in Ontario on July 06, 2005 at 05:57:01:

Paul,

Whatever is causing your surging is causing your high readings.

In addition to other items mentioned, wobbled out injectors, pressure regulator, PROM or ECM could be suspect too, as the fuel strategy is controlled electronically.

Your check engine light is on, right? If it isn’t, something is wrong in that area because if the system isn’t clamping as it should, the O2 readings should trigger that light on.

The converter "might" be adding to your woes, but it will not normally cause surging, I wouldn't think. Fix the surge and you've fixed your emmisions.

Allan

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