Low revs from cold start

[Chris15]

Hi Guys,

Been having this issue for the past week with my 172, when I get in the car in the morning, the car does start but at very very low revs Possibly 500 or less, if I touch the throttle it's then fine and will be through out the rest of the journey to work.

The car doesn't seem to have other issues if I start up after 8 hours of working its fine. Its a daily too, so it's not being left that long between taking it out.

Bit of a noob currently, so really after what I should be looking at first to start identifying what the issue could be.

Cheers

Chris

 

[Stay Puft]

Have you recently bought it? Might have something to do with the cold limiter. Is it hesitant to rev high for the first few minutes?

 

[Chris15]

I really don't know because I generally don't take it above 2-3k revs until I get out of town (5 - 10 mins).

I've had the car since October and was generally fine over the winter, it maybe did this once or twice.

 

[Chris15]

Hey guys,
On top of this I realised today I get a whine at around 2.5k - 3k revs and above. Sounds a little like a supercharger....
I'm not sure if its linked but at a wild guess I'm thinking alternator?
The cambelt and desipher was done around 8k miles ago and a similar time the driveshaft was done. (This was all done before I bought the car).I'm not sure when the aux belt was done last.

I also noticed the engine is lumpy on idle.(When warm too).

Any thoughts?