High idle issue and intermittent shifting cause IAC, TPS?

Tiny
SATURNTECH9
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Try unhooking the negative battery cable for about a min then hook it back up and see how it runs?

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Wednesday, December 12th, 2012 AT 1:14 AM
Tiny
DLVAUGHN1963
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Well I'm convinced the issue I s the pcv tube. Do you remember that tube I replaced three months ago? It looks like the hose I got from autozone. So I've ordered the hose from a gm parts store. Will let you know how it turns out.

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Wednesday, December 12th, 2012 AT 7:30 AM
Tiny
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Whats wrong with the tube is it bad again?

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Wednesday, December 12th, 2012 AT 4:31 PM
Tiny
DLVAUGHN1963
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It's not holding a seal where it goes into the valve cover

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Wednesday, December 12th, 2012 AT 9:21 PM
Tiny
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Have you tried putting on a hose clamp to see if it takes care of the problem?

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Thursday, December 13th, 2012 AT 6:17 AM
Tiny
DLVAUGHN1963
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Can't be clamped. I think the aftermarket hoses do not have the right dimensions for the hole the tube "t" goes in. The oem plug part is rubber and has a better fit. The aftermarket hose has a plastic "finned" plug that does not offer a tight enough fit for the hole, so there must be a grommet needed if you use the aftermarket hose. The problem with trying this, is you would have to take the throttle body off, and remove a clamp to do all this. Then I'd need a gasket and other things. I've ordered another hose, but this one is supposed to be oem. I will see when it gets here on Monday.

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Friday, December 14th, 2012 AT 3:28 PM
Tiny
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Sounds good keep me posted.

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Saturday, December 15th, 2012 AT 7:06 AM
Tiny
DLVAUGHN1963
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Well replaced the line and as always the initial start sounds good, then the random misfiring starts up. It seems that anytime something is replaced, it changes but not really fixed. It seem that when I replace a part, the engine goes thru a high rev that seem to cycle for about four accelerations. I attribute this to the engine computer relearning for idle mixtures. Of course when the engine goes though the rough idle cycles with the misfires, the intake air sounds like its being blocked or rerouted. I'm wondering if my mass airflow sensor is bad. Cause when I unplug it and let the engine run, it seems to settle to normal. I did get to replace the coolant temp sensor but that has not changed anything. I'm almost running out of options.

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Tuesday, December 18th, 2012 AT 4:13 AM
Tiny
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Try lightly tapping on the mass air flow sensor with a screw driver handle see if it runs any different?You could also try cleaning the mass air flow sensor with some mass air flow sensor cleaner.

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Tuesday, December 18th, 2012 AT 7:26 AM
Tiny
DLVAUGHN1963
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I unplugged and plugged the sensor, ran engine no change. Cleaned the MAF sensor last month, got no appreciable difference in performance. I'm not ruling out some sort of either gasket leak or possibly maybe even really bad fuel injector clogging. However I have read it will cost me quite a bit for gasket work, and I'm not gonna spend this much money on it. Ive only known about this misfire condition until I fixed the high idle issue. I'm at a loss now. The only part I have not changed is the ICM and Ive read that this component is either good or bad.

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Tuesday, December 18th, 2012 AT 4:57 PM

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