We're on Boost
15+ Year Contributor
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- Aug 25, 2007
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Seattle area,
Washington
Based on these logs, I suspect your FIAV is bad. As the ISC goes from all the way open down to where it should be, RPM goes up. The only way to have RPM go up like that is for more air to enter the intake manifold. I can only think of a FIAV doing that.
Yep and in post 34 he says he still has the FIAV in it. So that's likely the main problem. Too bad you can't bypass-plate the 1990 throttle body.
Side note I have a 1990 throttle body with my ISC and FIAV still
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i already installed the new gauge and sensor.
you got a different wideband! Good. I had an LC-1 up till 2015 and I always thought it was very reliable. I calibrated it once when it was new and never calibrated it again. It just seemed good.