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i cant figure it out

 
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Old 17 Dec 2011, 01:07 pm
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Default i cant figure it out

I might have posted before but I get lost in forums..

I have a 05 Limited approaching 90K and all tires replaced and balanced. I did the oil change and installed new plugs and wires at that time back in September. I just replaced both upper and lower mounts (according to Chilton's theyre torque struts. I'm told thats a worthless book).

Only on accelerating, it'll shake until I let off. I have no codes for misfires. In the morning on a cold start, it sounds like some knocking on the right passenger side when accelerating. Only when it's been running for about 30 minutes where everything's hot it shakes on acceleration.

Sitting idle at a stop and still in park and I let off the break to crawl, I can feel the car jumping and when going in reverse or drive on a slight incline when it has no power to move itself, you can feel it jerking. Whether the transmission has been serviced on this or not is unknown. We bought it used in May this year with 80K on the engine.

Help me out if you can because I'm at a total loss and don't have the money to pour into false positives.

Thanks, Merry Christmas and Happy New Year.
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Old 17 Dec 2011, 01:24 pm
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Default Re: i cant figure it out

Have you check the wheel bearing or CV axle...I had a vibration, under acceleration only, and it was a bad axle.
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Old 17 Dec 2011, 01:52 pm
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Default Re: i cant figure it out

you replaced both? how much?
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Old 17 Dec 2011, 02:04 pm
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Default Re: i cant figure it out

I paid $35 for the bearings and the axles $40 used plus labor...but I do all the work in my car
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Old 17 Dec 2011, 02:09 pm
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Default Re: i cant figure it out

this wouldnt be the cause of the jumping when idle is it? every so often itll jump below idle like its about to die but it never does.
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Old 17 Dec 2011, 02:12 pm
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Default Re: i cant figure it out

That could be the TPS (Throttle Position Sensor) or the IAC (Idle Air Controller). Both attached to the throttle body.
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Old 17 Dec 2011, 02:31 pm
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Default Re: i cant figure it out

is there a way to test these sensors with a meter?
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Old 17 Dec 2011, 02:46 pm
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Default Re: i cant figure it out

I don't think so but not 100% sure. I know the IAC can be taken off and cleaned, the other just replaced.

Actually, looking over what they do, they might not be the reason for the jumping idle but then again.....

TPS: The sensor signal is used by the engine control unit (ECU) as an input to its control system. The ignition timing and fuel injection timing (and potentially other parameters) are altered depending upon the position of the throttle, and also depending on the rate of change of that position.

IAC: The only purpose of the idle air control valve is to keep the engine’s idle smooth. The engine’s computer gives the idle air control valve the feedback it needs to hold a constant rpm.
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Old 17 Dec 2011, 03:28 pm
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Default Re: i cant figure it out

i guess i can try both and return them if they dont work.
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Old 17 Dec 2011, 03:51 pm
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Default Re: i cant figure it out

Ditto what Crewzin said, the only thing you really can do with them is clean them up.
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