Idle fluctuates
#1
Idle fluctuates
I have an 02 Mustang Gt and recently the service engine soon light came on, so I plugged a scanner in and got codes P0171 and P0174. While sitting still the idle will increase just for a couple of seconds and then go back to normal. It does this over and over. Other than this, the car seems to be running ok but it is due to be inspected at DMV. Any help would be appreciated. Thanks
Larry
Larry
#4
I agree with dave. I would check for a cracked, loose or disconnected vacuum hose. Get some carb cleaner and spray all hose connections with the engine running. If you have a leak the cleaner will get sucked into the intake and the idle will change. Also get some mass air flow cleaner and clean yours. This is what I would do first.
#5
OBD codes
FWIW you can look up OBD codes online http://www.obd-codes.com/
Suggestion regarding cleaning mass air flow sensor is a good one, computer controlled cars get funny when sensors report wrong
Suggestion regarding cleaning mass air flow sensor is a good one, computer controlled cars get funny when sensors report wrong
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