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Engine revving itself

My Ford Streetka keeps revving itself when stationary. I took it to Ford who changed the Lambda sensor, things have improved but it's still revving itself a bit and the engine warning light came back on within 24 hours.
After taking it back to Ford their next suggestion was that this is because I need a new catalytic converter.
Is anyone able to tell me whether this would actually cause a problem with the engine?
Other suggestions that I have found online include a problem with the idle control valve/ stepper motor and vacuum pipes. Any suggestions would be greatly appreciated!

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I would guess the idle control/stepper motor.

I think you could pic one up cheap at rockauto or ebay

Posted on Feb 12, 2009

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Firstly I took the car to a garage who said that they could change the plugs + air filter + fuel filter + oil etc. and if that didn't work could then try other things until they solved it. This sounded like a ticket to print money. I then decided to get a man who comes to the house and who carried out one of these diagnostic checks. He said it was the lambda sensor which is at the engine side of the catalytic convertor on the exhaust. Of course, the lambda sensor on this car model was not of the standard cheap type. The diagnostic man said about £300. On ebay I got one for £62. All internet instructions said a 15 minute job. However to save my husband of having to struggle under the car got a garage to do the job, which took 10 mins and cost £10. Car now runs like a dream, no flat spot and no chugging.
Rosemary2729

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