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Re: 94 Grand Prix cold start problem
Yes, if the EGR is stuck open this would be the same effect. The engine doesn't like *any* EGR at idle because it interferes with combustion stability.
I would think you'd also see some power loss due to that.
'94 being OBD-1 would not have any extended diagnostics for verifying function of the EGR...it would just be commanded in open loop and that's it.
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1988 Chevy R-30 1 ton DRW pickup (217k)
1991 Chevy S-10 4WD pickup (192k)
2000 Grand Prix GTP (218k)
2002 GMC Yukon (185k)
2009 G8 - GT (46k)
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