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Surging car while in auto
Have a 2001 s60 that was just purchased. Has 171,000 miles on it. Problem that happening is car surges/jerks while in automatic mode mode of the transmission at 40 mph. I can put the car into manual mode and it goes away? Was told could possibly be a spark plug but I wanted to see if anyone else has had the same problem.
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Is there a stored code?
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Originally Posted by jerick1976
(Post 455475)
Is there a stored code?
No stored codes or check engine lights. All fluid look great including transmission. |
It seems unlikely to me that a spark plug would be speed sensitive but they're cheap so swapping them out wouldn't hurt anything. I would be looking at the throttle body. Volvo calls it an ETM. They are prone to failure on your year of car. XeModex has a good product that addresses the parts that are prone to failure.
https://xemodex.com/us/product/elect...6001821-10-20/ That page also has some useful troubleshooting docs to help with the diagnosis. Normally you'll get a code though. Are you using Vida or just an OBD2 scanner? An OBD2 scanner won't pick up any codes that deal with the system bus including an ETM error. |
Originally Posted by jerick1976
(Post 455490)
It seems unlikely to me that a spark plug would be speed sensitive but they're cheap so swapping them out wouldn't hurt anything. I would be looking at the throttle body. Volvo calls it an ETM. They are prone to failure on your year of car. XeModex has a good product that addresses the parts that are prone to failure.
https://xemodex.com/us/product/elect...6001821-10-20/ That page also has some useful troubleshooting docs to help with the diagnosis. Normally you'll get a code though. Are you using Vida or just an OBD2 scanner? An OBD2 scanner won't pick up any codes that deal with the system bus including an ETM error. I’m using an icarsoft scanner made for Volvo so it gets me further along than anormal scanner. I did notice if I put the car on cruise control at the speeds the surging is happening, it stops. I’ll have to start with the etm and see what happens after that. Thanks for the info |
Some of the troubleshooting docs on the Xemodex site deal with problems after a swap. Personally I would be looking at the fuse and relay they mention and testing them as a first step followed by a thorough cleaning of the throttle body using an appropriate cleaner before dropping 500.00 on a rebuilt ETM.
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