What is life like with your car? Let us know and win £500 in John Lewis vouchers | No thanks
High idle speed
My Mondeo used to idle at just under 1,000rpm on the rev counter. Now, when I start it up, it goes up to 2,500 for a few seconds, then comes down to just under 2,000rpm.
When driving, when I come to a junction, the rev counter goes up past three and at other times when stationery, the revs alternate back and forth from 2k to 2,500.
Also, another problem, difficult to describe but I think it may be related, when using cruise control, it feels like it's running out of petrol. This is the cycle:
1. The cruise control accelerates,
2. car goes,
3. then feels like engine is starved of fuel,
4. The cruise control accelerates, etc.
My question is, What would cause the engine idle speed to go so high, and how can I stop it?
When driving, when I come to a junction, the rev counter goes up past three and at other times when stationery, the revs alternate back and forth from 2k to 2,500.
Also, another problem, difficult to describe but I think it may be related, when using cruise control, it feels like it's running out of petrol. This is the cycle:
1. The cruise control accelerates,
2. car goes,
3. then feels like engine is starved of fuel,
4. The cruise control accelerates, etc.
My question is, What would cause the engine idle speed to go so high, and how can I stop it?
Asked on 20 June 2011 by ljinno
Answered by
Alan Ross
Firstly I would suggest that you check all air/vacuum pipes to see if they are split/damaged or loose.
If all ok then check your air filter is ok (not clogged)
Then if all OK I would suggest that the MAF is checked (mass air flow meter)normally located next to the air filter box. You may be able to disconnect the MAF sensor and try running the engine without it to see if the problem goes away. If it does then that is your problem.
If all ok then check your air filter is ok (not clogged)
Then if all OK I would suggest that the MAF is checked (mass air flow meter)normally located next to the air filter box. You may be able to disconnect the MAF sensor and try running the engine without it to see if the problem goes away. If it does then that is your problem.
Looking for a garage you can trust? Honest John's Good Garage Guide has thousands of reader recommended garages, plus how-to guides and tips on servicing.
The Good Garage GuideSimilar questions
I have a W-plate Vectra Estate and recently the rev meter is spiking intermittantly to 7000 revs even though the engine is ticking over fine. Also the l.c.d. panel to the stereo has gone blank and the...
My Tigra, which I've had about two weeks, has developed a fault. It drives fine, it starts fine, and it runs great until it's warm enough for the air injector pump to cut out. Then the engine becomes lumpy...
I have an ageing (53 plate, 120,000 mile) Audi A4 1.9 TDI. It has been a great car but over the past few months the idle has gone "lumpy" intermittently.
Above idle it runs smoothly, there is no loss...
Elsewhere on 
.jpg)
