HIGH IDLE ISSUE AND INTERMITTANT SHIFTING CAUSE IAC, TPS?

1999 Buick Century

Tiny

dlvaughn1963

September, 26, 2012 AT 8:26 PM

Will let you know definitely tomorrow. The PVC connector end looks like a plug boot cover that was put at the end of the tube. It also causes a whistling sound I think the boot that was used I too soft and causes the "cap" to collapse hense the horrible sound in the engine compartment.

Tiny

saturntech9

September, 26, 2012 AT 8:39 PM

That sounds like a good start keep me posted.

Tiny

dlvaughn1963

September, 27, 2012 AT 5:46 PM

Replaced PVC tube, idle is much better. Computer must still be learning fuel mixtures and shifting is much better with some sluggishness. The old hose was loose on the vac connector from the vap solenoid. Will see how things work out after a few trips. I do still wonder about the IAC. The maintenance manual shows the removed position of the actuator so ill look into that next b

Tiny

saturntech9

September, 27, 2012 AT 6:03 PM

Try taking the negative battery cable off for about a min then put it back on and see how it works then.

Tiny

dlvaughn1963

September, 27, 2012 AT 10:49 PM

Codes cleared still high. Will look at possible bad IAC

Tiny

saturntech9

September, 27, 2012 AT 11:07 PM

Have we looked for more vacuum leaks?What about the coolant temp sensor have. We looked at that yet?

Tiny

dlvaughn1963

September, 28, 2012 AT 12:23 AM

Coolant temp is relative to engine performance. The temp at the moment never goes over half way

Tiny

saturntech9

September, 28, 2012 AT 1:19 AM

I have seen cars with no symptoms of overheating etc with a failing coolant temp sensor causing a high idle.

Tiny

dlvaughn1963

September, 28, 2012 AT 1:41 AM

Ok will look at that next

Tiny

dlvaughn1963

September, 28, 2012 AT 1:43 AM

The codes did clear when I disconnected battery but did come back. I suspect the bank1 o2 is still bad cause the fuse is again blown. This o2sensor is not easy to get to unless I pull the ignition control module and coils.

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