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Virtual Wrench
Virtual Wrench, Master Mechanic
Category: Car
Satisfied Customers: 14620
Experience:  35 years/Master Tech. Foreign and Domestic
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Rpm..jumping..the car is idling over 1 then back below 1 instantly

Customer Question

My car is not idling right. The rpm keep jumping up and down. When stop the car is idling over 1 then back below 1 instantly. When I step on the gas, the car starts to jerk and it does not shift into the next gear right away, the rpm goes up passed 5 then it shifts. What is wrong?
Submitted: 10 years ago.
Category: Car
Expert:  Virtual Wrench replied 10 years ago.
Did this problem just start? Or has it been acting up slowly?
Customer: replied 10 years ago.
Reply to Virtual Wrench's Post: it just started
Expert:  Virtual Wrench replied 10 years ago.

It sounds like there is a vacuum leak causing both the idle flucuating and the late shifting. You will need to look around in the engine area for any small hoses that may have come disconnected. If you can't find any, then you will probably be better off to take it into the shop for an acurate diagnoses. I don't think it is anything major, just might be a little tough to find.

 

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V W