Touareg :: Cool Start Acceleration - Car Will Go Forward For About 1 Feet Then Choke For Couple Seconds
Apr 4, 2005
My car has been having a cool start acceleration problem in the past couple weeks.
After I start the engine, switch to D ("Drive"), and step on the gas paddle half way, the car will go forward for about 1 feet. Then it will choke for couple seconds. If I release the gas paddle and then step on it again, it will do the same thing.
However, if I just slightly step on it and let it slowly accelerate, it will be fine. Also, it only happens on a cold start.
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I'm experiencing an annoying problem with the air recirculation value on my Touareg. Basically it will randomly go into oscillations for a coupld of seconds, where is sounds like the vent blowers are either speeding up and slowing down quickly, or the recirculation valve is opening and closing rapidly.
This seems to happen randomly, and usually only lasts for a couple of seconds. I've taken it to the dealer twice but they aren't able to determine the cause of the problem.
Here is my theory for what it's worth. I think it may be the recirculation valve, whose job is to close the external air value from outside air to recirculating internal air when it senses pollutants in the outside air. I think the problem is caused by one of two scenerios;
1) the sensor is bad or failing and sends random signals to the vent controller causing it to open and close rapidly, or
2) The control circuit is not tuned correctly, thus instead of waiting to see if the pollutants it senses is sustained, it reacts instantaneously.
The noise this produces is quite annoying!
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Summary of Events:
Lower radiator hose decided to disconnect itself.
Stopped and had car towed home.
Connected hose and filled coolant system.
Car is hesitant to start and takes a couple seconds of cranking.
Misfires in cylinder 3, and a few in cylinder 5, no other codes.
New OEM plugs, no change.
Swapped coil packs around, no change.
Idle is rough but at speed, everything is smooth.
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I've noticed on first start up the RPMs go as high as 3000 for a couple of seconds and then drop to normal even at 68' degrees,is that normal? because if it is what will aspect when the temperature drops to 20 or even lower.It is a 2.5 liter 4.
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I've been told by my dealer that the 6-speed transmission in our rigs is known to shift roughly. They have therefore pronounced my truck healthy. However, I don't think I believe it. I've never seen a vehicle that lurched forward on upshifts under moderate acceleration. It behaves if I punch it. It behaves if I accelerate like my granny. Anything in between and I get a fairly violent jump at each shift point. At times, in stop-and-go traffice, I have thought the truck would jump into the car ahead of me. This behavior seems to be unrelated to which transmission mode I'm in. D, S, and Tip all do it. I love the motor in this thing, but I'm starting to hate the tranny. What should I tell the dealer to look for on the truck that might be causing this? The truck is going in next week to replace a fog light with condensation, so I'm hoping to get them to look at it then.
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