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Engine runs at a fast rpm till you come to a complete stop.

engine runs at a...

engine runs at a fast rpm till you come to a complete stop. then rpm goes to normal

Mechanic's Assistant: How many miles are on the car? Is it an automatic or a manual transmission?

Manual 4x4 120,000

Mechanic's Assistant: What is the model/year of your Ford?

1998 ranger xlt v6

Mechanic's Assistant: Are you fixing your Ranger yourself? What have you tried so far?

Vacuum leaks none .new air cleaner, no check engen lights

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Runs 2000 rpm wen in motion 1100 wen you come to a compleat stop

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Answered in 2 minutes by:
3/21/2018
HDGENE
HDGENE, Ford Senior Master/Diesel/Trans
Category: Ford
Satisfied Customers: 6,594
Experience: 28 years Auto experience, Ford ,GM, Chrysler, Asian & European
Verified

Hello, and thank you for using Just Answer! My name is***** me a few moments to review your question and Ill do my best to assist you.

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Hello, there are 2 different v6 engines 3.0 or 4.0 which one do you have? When did this start? After disconnecting the battery?

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Customer reply replied 4 months ago
3.0 v6
Just stared
No the battery was not dissconekted

Ok a few different things can cause this. You said it has no vacuum leaks, a stuck pcv valve can cause a higher idle speed, a dirty throttle body plate with carbon buildup. So inspect and clean the throttle body if it is dirty. Debris on the mass air flow sensor heater wire whether it be a bug or dirt. You would have to remove the sensor to inspect it and clean it using MAF cleaner or brake cleaner only. Lastly would be an issue with the idle air control valve itself sticking. A scan tool can run both a key on engine off and a key on engine running test to check on demand faults even though the check engine light is off. The MAF sensor may not set codes if it is dirty.

HDGENE
HDGENE, Ford Senior Master/Diesel/Trans
Category: Ford
Satisfied Customers: 6,594
Experience: 28 years Auto experience, Ford ,GM, Chrysler, Asian & European
Verified
HDGENE and 87 other Ford Specialists are ready to help you
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