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Error code 77


ranger90

Member
Joined
Nov 2, 2007
Messages
7
Vehicle Year
1990
Transmission
Manual
Hello to all! Now here's my problem.
1990 ranger 4x4 2.9 manual.
Idle was not smooth, mileage awful. OBD KOEO checks okay.
KOER code 77. No matter how I goose the throttle (foot feed or manually).
It shows code 77. As far as I know 77 is operator error? I did change the TPS and IAC valve. No vacuum leaks. Idles better, do not know about the mileage. Still throws code 77. Even after erasing codes. Has anyone had this problem before? (I'm sure). Any help with this is much appreciated.
Thanks.
 

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