Subject: Re: Hunting Idle, stalling by BillH on 2011/7/18 13:05:23
Quote:
CorvetteBob wrote: Another note, after setting the timing tonight, I revved it and held steady at 1600. With a steady foot on the pedal, the engine speed alternated from 1600-1700RPM every several seconds. I also tried holding a steady pedal at 2200 RPM and it not only did the same thing from 2200-2300+, but I could feel the pedal seemingly "fall out" from under my foot, then come back as the engine speed fluctuated. Could there be something goofy causing the EGR valve to cycle, letting in too much "air"?
Very doubtfull Bob. Do the TPI motors have a solenoid on the EGR? Even if they do, I'd bet big bucks that the EGR isn't the problem.
I think you need to find a shop with a scope and do the above. The engine speed should be rock steady (as steady as your foot can make it anyway).
There's only 2 things that can cause the above, spark or fuel. A scope will tell you if anything's going on with the spark. Fuel- probably not a fuel pressure thing but could be injector imbalance. How many miles on your injectors?
