02 2WD Engine/Tranny Problem
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Joined: Oct 2006
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02 2WD Engine/Tranny Problem
I have an issue with my 02 2WD 4.6L today that I have never encountered before (this is an automatic tranny). Everthing was fine going down the interstate but upon exit the idle speed was way over normal and I had to brake really hard to stop. The idle speed jumped to 3k rpm's in neutral.
Leaving the exit ramp the throttle continued to be really fast and the truck speed was a lot less than the rpm's would normally produce. The tranny would not shift from low to 2nd without letting off the throttle and it didn't shift into 3rd or OD. Turning the OD on or off didn't make any difference.
After shutting off the engine, a restart results in the idle speed of 2K rpm in Park and the high idle remains when the tranny is shifted into "D". I attached my scan tool and there are no codes or pending codes.
Does anyone have any ideas on what this might be or if there are other diagnostics that I should try?
Leaving the exit ramp the throttle continued to be really fast and the truck speed was a lot less than the rpm's would normally produce. The tranny would not shift from low to 2nd without letting off the throttle and it didn't shift into 3rd or OD. Turning the OD on or off didn't make any difference.
After shutting off the engine, a restart results in the idle speed of 2K rpm in Park and the high idle remains when the tranny is shifted into "D". I attached my scan tool and there are no codes or pending codes.
Does anyone have any ideas on what this might be or if there are other diagnostics that I should try?
Lead Driver
Joined: Sep 2006
Posts: 7,907
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Yes.
First what controls idle speed?
Intake Air Controller (IAC) right?
It's stuck open.
Remove it and do a cleaning so the pintel valve is free to move.
Use throttle body spray cleaner or replace the part..
Good luck.
First what controls idle speed?
Intake Air Controller (IAC) right?
It's stuck open.
Remove it and do a cleaning so the pintel valve is free to move.
Use throttle body spray cleaner or replace the part..
Good luck.
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