Rev hunting on cold start

[OBR]

Hello everyone,

 

Hope you are all well. I have a 2012 Monte Carlo 1.6tdi (the famous, bulletproof, engine with no issues), which has a slight problem.

 

On a cold/fresh/morning start, the revs will seem to hunt a bit, almost as if it's shaking itself into life. There's no real fluctuation on the dial most of the time, but you can hear the revs fluctuating on start up, and sometimes the dial will fluctuate. Starts on the button every time with no struggles what so ever. I haven't noticed a loss in power or performance, still gets moving if you put your foot on the carpet.

 

I've checked the timing belt, it runs straight and it feels tight, with no oil leaks present. Not ruling it out, but it's not exactly flapping about in the wind. Not sure if it could be fuel pump, or injector (unlikely, as they live forever). Or maybe a mysterious third thing.

 

Has anyone had this experience before? I know the answer is always "take it to the garage" but I'd a) like to be somewhat clued up going in and b) if it's something I can fix without having to go to the garage, bonus!

 

Thanks in advance,

Oliver

[sepulchrave]

Always worth checking the glow plugs since it's easy to do.

[Ootohere]

@OBRhave you had a look in the Air Filter box recently? 

 

Bullet proof engines as long as they never got 'The fix' done so the engine management changed and the airflow device addition.