Idle surges about 300 RPMs up and down while moving.
This is a 2002 Audi A4 1.8T Auto.
The car idles fine even when the transmission is enganged, howerver, when I start moving the car shakes a bit and when the transmission changes gear it shakes again. I also noticed that once the car is moving the RPM go up and down in a range of about 300 RPMs, during this time the car holds back and then continues. As you can see this sounds like two different problems, I look forward to read ideas about these two problems. Thanks in advance. |
sounds a little like limp mode. Use a code reader to check for codes.
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Originally Posted by shane.trammell
(Post 1054030)
sounds a little like limp mode. Use a code reader to check for codes.
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But there were codes this morning? What did they say?
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Originally Posted by shane.trammell
(Post 1054047)
But there were codes this morning? What did they say?
This is because the coil on cylinder 3 was not working at all, the coil was replaced and the code cleared. |
Ok. Vacuum leaks can cause idle issues so I would start with that and hope that fixes it.
On the shifting probs check your snub, motor, and trans mounts. |
Originally Posted by shane.trammell
(Post 1054053)
Ok. Vacuum leaks can cause idle issues so I would start with that and hope that fixes it.
On the shifting probs check your snub, motor, and trans mounts. shane excuse my ignorance, what is the snub mount? |
The snub mount is a motor mount on the bottom front of the motor.
So you can be cruising down the highway and the rpm will just be moving up and down? |
Originally Posted by shane.trammell
(Post 1054066)
The snub mount is a motor mount on the bottom front of the motor.
So you can be cruising down the highway and the rpm will just be moving up and down? You can can feel it and if you look at the tach you will see the needle jumping up and down. |
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