RPM on idle bouncing up and down

localknoxville

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Hello
When I start up my 2.0TDI it's starting to have an issue on idle, bouncing from 800-1000 and makes the car shake
It only does this during idle, car drives fine, no power loss, no leaks of anything under the car, no oil leaks, no smoke
Car starts up no problem, it does not struggle to fire up and it does not stall when stationary
I have scanned it and it's not showing any fault codes and there is no engine light on the dash
I removed the Throttle Body, expecting it to be clogged up but it was pretty clear, so give it a clean and put it back on
Just looking for ideas of things to check, some have suggested it could be any of the following, Bad Fuel Filter, HP Fuel Sensor, Fuel Regulator, Vacuum Leak, Injectors
If anyone has any advice or has had this before, it would be great to hear from you so I can start checking things, cheers
 
Last edited:
Hello
When I start up my 2.0TDI it's starting to have an issue on idle, bouncing from 800-1000 and makes the car shake
It only does this during idle, car drives fine, no power loss, no leaks of anything under the car, no oil leaks, no smoke
Car starts up no problem, it does not struggle to fire up and it does not stall when stationary
I have scanned it and it's not showing any fault codes and there is no engine light on the dash
I removed the Throttle Body, expecting it to be clogged up but it was pretty clear, so give it a clean and put it back on
Just looking for ideas of things to check, some have suggested it could be any of the following, Bad Fuel Filter, HP Fuel Sensor, Fuel Regulator, Vacuum Leak, Injectors
If anyone has any advice or has had this before, it would be great to hear from you so I can start checking things, cheers
I had a similar issue with my 3.0 TDi, tended to happen only when the engine was up to temperature and it turned out to be a very small leak in the head gasket. Gradually got worse until it would eventually make the car but out on idle, had the Head Gasket replaced and been fine since
 
I had a similar issue with my 3.0 TDi, tended to happen only when the engine was up to temperature and it turned out to be a very small leak in the head gasket. Gradually got worse until it would eventually make the car but out on idle, had the Head Gasket replaced and been fine since
Thankfully, mine was not that extreme, I replaced the Fuel Pressure Regulator and the car is now back to running normal :thumbs up: