Bucking and idling high

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07-07-2006, 09:48 PM

1990mustanglx

2nd Gear Member

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Location: beverly mass

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Bucking and idling high

My car just statring idling at 1500 the other day and a week later now it idles at almost 2500 and it bucks in like 2nd gear when i have it at 2000rpms just cfruising down the street any ideas as to whats wriong with it??

07-07-2006, 10:28 PM

lookinforastang

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RE: Bucking and idling high

whats bucking? like surging?

07-07-2006, 10:29 PM

1990mustanglx

2nd Gear Member

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Join Date: Mar 2006

Location: beverly mass

Posts: 261

RE: Bucking and idling high

bucking like not getting enough gas. its when the car jerks back and forth

07-07-2006, 10:40 PM

lookinforastang

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RE: Bucking and idling high

sounds like fluctuating fuel pressure

07-07-2006, 11:04 PM

1990mustanglx

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Join Date: Mar 2006

Location: beverly mass

Posts: 261

RE: Bucking and idling high

How do i fix it

07-07-2006, 11:05 PM

Joel5.0

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Join Date: Jan 2006

Location: Puerto Rico

Posts: 3,926

RE: Bucking and idling high

Idle high + bucking....check for vacuum leaks, disconnected vacuum lines or hose (PCV, vacuum tree, brake booster check valve, etc)....or you may have a problem with the TPS, stuck IAC valve,....check TPS output voltage, or run a DIY KOEO/KOER self-test to check for any other failure codes that may be causing the problem.