As the vehicle warms up the idle surge will get worse and worse, eventually the car will stall. I have adjusted the min air screw to range all the way from 15 to 40 and regardless on setting the idle will not stabilize. TPS is 0.42 or 0.44 volts.
IAC will decrease to ~20 and then suddenly surge to ~70-90 and then the process will repeat, eventually worsening until the car stalls. I can see the vacuum drop and AFR lean out from 14 to 17 as it surges. With a 3 inch LT1 MAF and translator what should my MAF reading be at idle? could the MAF be failing? fuel pressure is ~43 line off ~35 line on.
I have tried a new ECM and it had no affect. Also did a IAC reset and that did not seem to affect it. It finally decided to stall while i was driving it.
I could parts cannon an IAC valve at it but am looking for something a little more certain. sometimes the car will throw a code - 41 when the idle gets really low and surges.
IAC will decrease to ~20 and then suddenly surge to ~70-90 and then the process will repeat, eventually worsening until the car stalls. I can see the vacuum drop and AFR lean out from 14 to 17 as it surges. With a 3 inch LT1 MAF and translator what should my MAF reading be at idle? could the MAF be failing? fuel pressure is ~43 line off ~35 line on.
I have tried a new ECM and it had no affect. Also did a IAC reset and that did not seem to affect it. It finally decided to stall while i was driving it.
I could parts cannon an IAC valve at it but am looking for something a little more certain. sometimes the car will throw a code - 41 when the idle gets really low and surges.