Question about 1999 Buick Park Avenue

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The engine or transmission jerks a lotn while driving.

I'll drive for a while and it will run fine. All of a sudden, it starts to shifting hard. I don't know what it is exactly?

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  • 28 Answers

Try changing the trans filter and fluid if that dont help try changing the shift modulator valve.

Posted on Feb 05, 2009

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Vvti avanza engine no power runs eratically after driving slowly in third gear when engine jerked


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I would to know if a bad transmission speed sensor can cause the car to jerk when you shift into drive or reverse


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1 Answer

When i put my car into drive it jerks forward suddenly and when i put it in reverse it jerks backward also. its never done this before


1. Extremely harsh shifts from P or N, normal shifts at WOT: EPC (Electronic Pressure Control) solenoid failed. Easy fix in pan. Fix as soon as possible or hard parts will eventually break.
2. Shift suddenly become very hard. When going from park to either reverse or drive it slams into gear. 1-2 and 2-3 shifts are also harsh. All gears seems to work. Problem may be intermittent: Check TPS for smooth electrical response. If the response is jumpy or erratic at all, replace TPS.
There are two thing that may be happening that you have described, but you can tell which one it will be since your driving the Blazer. Both are simple to repaire, but to change the EPC. Your going to have to drop the transmission pan so that's going to be a transmission shop and call around, the EPC can be replace the same time there draining the transmission fluid when servicing the transmission which is about $110.00 for fluid and filter replacement and additional $65.00-$80.00 for the EPC valve.
EPC (electronic pressure control) valve TPS (Throttle position sensor)
Thank you for using Fixya and good luck. If it's the EPC failure, replace as soon as possible. may casue the sunshell to fractured or splines to sheared off.

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1 Answer

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1990 gmc k2500 new 5.7engine & turbo 400 ,power lose & noise.


sounds as if you may be looking in the wrong spot. If different gearing is drastically changing the symptoms you may want to check the trans. or torque converter. sudden pop with engine rpm increase and lack of power sounds like possible band breakage in transmission or impellor breakage in torque converter.

Oct 20, 2008 | 1990 GMC K2500

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