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tomtom72 · 01-12-2008

Tony, I think this maybe a shot in the dark. There is a TSB over at the netreg site about idle fluctuation in closed loop. GM issued a updated PROM as a remedy for the 90 ECM's. I don't think this is your issue but it maybe worth a look if ya run out of things that are obviously n/g.

Tom

01-12-2008	#6
tomtom72 Join Date: Dec 2004 Location: Jacksonville, FL USA Posts: 4,609	Re: 90 wont pass smog Tony, I think this maybe a shot in the dark. There is a TSB over at the netreg site about idle fluctuation in closed loop. GM issued a updated PROM as a remedy for the 90 ECM's. I don't think this is your issue but it maybe worth a look if ya run out of things that are obviously n/g. Tom __________________ 1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member