Question about 2006 Buick Rendezvous

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I want to know why the car jerks and the rpms are varying under normal driving conditions--is it caused from the lock up converter or the transmission??

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If you have taken all precautions to make sure that it isn't electrically related...the converter would be a good assumption, it is usually more noticeable on an incline while in overdrive.

Posted on Oct 29, 2009

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Posted on Jan 02, 2017

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VOLVO S80 2000,MY CAR DRIVE'S FINE BUT CUTS OUT AT ROAD JUNCTION'S AND TRAFFIC LIGHTS, CAN ANYONE HELP, THANKS.PS the car has a manual gearbox.


This is just a TOTAL STAB... in the bewilderness...
because you really gave very little INFORMATION...

Hello Jill Dunkley...

If and ONLY if...
your car has an AUTOMATIC TRANSMISSION...

THERE IS A CONDITION where the Fi (fuel injection)
will develop a problem with the COLD-START circuit
(mimics a choke on new cars)... will cause the
IDLE to climb... and heavy shift when put into drive.

Won't pose much of a problem while the vehicle is cold...
but as the vehicle WARMs up...

The RPMs are high enough to reach the "LOCK-UP"
speed of the torque-converter.

With your foot on the brake it will cause the car to stall
as sure as a MISHANDLED CLUTCH under the foot of
rookie driver...

SOLUTION:
Get the vehicle diagnosed...
Fix the COLD START issue to REDUCE THE IDLE SPEED.

Drive safely.

Apr 04, 2017 | Volvo Cars & Trucks

1 Answer

Jerking accelerating


This may be normal but you can adjust your driving to reduce the impact. To speed up the warm up process of the catalytic converters, the power train computer holds first gear a little longer than normal. This causes your car to get higher in the rpm range than normal, at part throttle, which causes the hard shift. On your first drive, try NOT to accelerate while the car is in first gear--it won't take long for you to learn how far this is.

Apr 22, 2014 | Mercedes-Benz E-Class Cars & Trucks

1 Answer

1999 oldsmobile intrigue stalls and surges under deceleration conditions only. Idles in neutral fine, accelerates fine, has no apparent miss. Can put in gear and travel great until under negative torque...


Do you have any codes? If so, what are they?
If not, this could be a mechanical problem with either the torque converter itself or some sort of stuck valve in the valve body inside the transmission.
I just replaced the valve body in my wife's 1999 Mercury Sable and it cleared up a number of problems she was having with shifting and torque converter lock up.
I hope this helps.
Good Luck!

Sep 21, 2013 | 1999 Oldsmobile Intrigue

2 Answers

Jeep cherokee jerks when shift into overdrive going 45 mph


If the engine has a rough idle you know you have a miss-fire or other problem with one or more cylinders.
When you shift into overdrive the engine is working harder than in normal drive because of the lower torque/RPM.
So any slight miss under normal conditions will be magnified in overdrive or with the ac on.
See if you can nail down the cause for the rough idle.

Jul 19, 2012 | Jeep Cars & Trucks

1 Answer

I have a 1999 Mazda 626 5 speed and my rpms seem to always be high weather I'm driving n town, 4th gear 30 mph 2100 rpm, or on the highway 5th gear 70 mph and rpms at 3100. This I'm sure is killing my gas...


check clutch for slipping condition,mayb due to worn clutch disc or a oil contaminated disc or a weak pressure plate not locking disc to flywheel therefore giving u a slipping condition and higher than normal rpms

Apr 09, 2011 | 1999 Mazda 626

1 Answer

At a stop car jerks forward with brakes applied


Are the engine rpms climbing when its jerking forward? seems like it could be a Transmission torque converter problem.

Apr 04, 2010 | 2004 Dodge Neon

1 Answer

Ford sierra


I am going on vacation so I hope this helps,
Surely since its a car-borated engine with numerous vacuum lines, one vacuum line could be leaking causing this condition.
Setting that aside for now you could have a skewed T.C.C. valve. Thats the transmission converter clutch valve. It locks up the transmission torque converter to aid in fuel mileage at speeds above around 40 mph. The unit is normally locked out of 1st gear. When it acts up it applies at the higher speeds but doesn't disengaged. This will cause the engine to stall. The feeling to the driver is quite distinctive. The normally is a shaking or vibration felt the moment before the engine stalls, it could feel like a shutter not unlike the sensation one feels when driving a stick shift and comes to a stop in gear without depressing the clutch petal. The hole thing is controlled by the engine computer. There is a connector on the transmission which is normally square with 4 receptacles, disconnect it and drive the car as you normally would. See if it stops stalling. If so you need to replace the solenoid. Its located in the transmission under the transmission pan. This a long shot but without inspecting all the vacuum lines and numerous other sup-systems its well worth looking at a could be a fast test. Just unplug it and drive it normally

Jun 18, 2008 | 1994 Ford Escort

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