Rover 25 1.4 reving up on idle when warm

saitrix

saitrix

saitrix

Soldato
Joined
2 Jun 2003
Posts
8,950
Location
Nottingham
Hi,

A friend of mine has a 02 Rover 25 1.4 K series, when it is warm the engine is reving up to 4000rpm area instead of the usual idle of 800rpm.

Any ideas?
 
I had an air leak on my MG ZS on the plastic manifold which I had damaged when replacing the engine and that screwed the idle speed up. A bit of epoxy sorted it.
 
I woudn't have thought it's the head gasket.

A cleaning of the throttle body and associated sensors will probably help. Bad lambda sensor can also cause idle problems but i've not heard of one that severe!

I think an air leak is more likely. These can be a swine to find and fix, I'm told spraying wd40 into the inlet pipe and see if any escapes is a good way to try and find it, don't really know if that will work.
 
If its variable, then its probably the Idle Air Control Valve or an air leak. If its constant, then you can reset it by turning the key to position 2 (With engine off!) and depressing the accelerator 5 times slowly.
 
Throttle body?
Faulty idle air control valve?

I had a similar problem with my old car. But the opposite, It revved when cold.
It was a combination of the above.
 
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Leeum said:
Does it have an idle control valve on the throttle body? I'd remove the whole assembly and clean it :)
Click to expand...

What could you use to clean an ICV if you don't have any carb cleaner? I think i have the same problem as the op with my Focus.
 
when i had that problem on my 214 it was the stepper motor (the shaft on the motor was worn)
it was sticking, i replaced it and the car idled fine after
 
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