1999 Buick Century Repair Question
High idle issue and intermittant shifting cause IAC, TPS?
Try unhooking the negative battery cable for about a min then hook it back up and see how it runs?
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.
Whats wrong with the tube is it bad again?
It's not holding a seal where it goes into the valve cover
Have you tried putting on a hose clamp to see if it takes care of the problem?
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.
Sounds good keep me posted.
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.
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.
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.