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SignUp Now!IAC numbers should fluctuate. Numbers look good.84GNTTYPE said:Since I replaced the TPS, I haven't been able to get the IAC to hold a setting. Even when I think it is set and I watch the computer, it will fluctuate between say 21-27.
Numbers will start high on the IAC and settle down as you start the car and let it idle. Be sure to drive the car a bit after you reset the ECM and IAC/TPS. Then reheck it.84GNTTYPE said:Then when I turn the car off and turn it back on the number will be WAY out there say around 80 or sometimes worse. Or sometimes way down, almost to zero. I have tried cleaning the IAC, but it makes no difference.
84GNTTYPE said:Things I have tried so far:
--Checked the resistance between coilpack towers. They were 13.98, 13.85, and 13.81. MAF readings are still 7-8 at idle.
84GNTTYPE said:I haven't checked the plugs or wires yet . . . that is next on the list, once the car cools down. What should the resistance of the plug wires be?
My headlights and interior lights will sometimes pulse, but I don't detect any fluctuation in voltage coming from the alternator. Could this be related to my current problem?
84GNTTYPE said:Coilpack resistance, when cold, is 13.12, 12.99, 12.92.
When disconnected, the O2 readings stay within about 100 of 446.
I plan to take a look at the plugs tomorrow.
What do you mean by the inside of the ignition module? Sorry for the easy question.
Can most shops check my coil pack and ignition module, or do they need a special tool?
The meter goes neg because it is in the 3 decimal negative area and will show -0.00. For the sake of this experiment to “Zero”.84GNTTYPE said:Checked the O2 sensor wires at the ECM. I checked the voltage of the O2 ground. It was 0 with the key off. When I turned the key on it showed -0.00. Not sure what the negative means? With it running it showed -0.02. ........... Where does the O2 ground go to?
Read somewhere it could be the MAF.84GNTTYPE said:Unplugged the O2 sensor tonight when I was done to make sure it was still doing the same thing . . . and sure enough. I unplugged the sensor and it smoothened right out. ………… I have a working ECM on the way. …… I also have a MAF coming.
The added load on the engine of the AC and power steering will effect the idle but the ECM should adjust through the IAC. The issue here is still your O2 CC. Hopefully the ground check, MAF and ECM swap will fix this.84GNTTYPE said:I read something in the GM Chassis manual that the a/c clutch and power steering switch effect idle quality too? There wasn't much info on the topic, was wondering if anyone else has ever heard of that?
highboost said:have you checked for a short in the wiring to the o2 sensor somewere under the split loom? my old GN had a coroded wire inside the insulation of one of the o2 wires that caused a simular problem that was intermitent.