The GM designation for the 5.7 liter, (350 cubic inch), TPI motor. This motor was used in other GM vehicles, but was used in the Corvette from 1985 t...
Subject: Re: Running rich and hunting for idle by lunytnz on 2014/9/5 14:10:49
Quote:
Schrade wrote: Maybe get the tune diagnostic BEFORE putting in a new O2.
Rich burn might foul the O2 element. It WILL foul cats...
That's *exactly* what I was hoping to do, Schrade. But, I'm not able to figure out, so far, what the cause might be. I have heard that the O2, itself, might be the cause.
The part that has me most confused is that I'm getting the 45 code (running rich), but the MPG on the dash (which I believe is based on pulse width) is high, indicating that the engine is running lean. But, *actual* (calculated) MPG is lower than normal.
I'm also wondering about the Evap Emissions system... I think it may be pumping air into the exhaust full time, but can't figure out how that would cause a rich condition.
