1989 Ford Bronco

GRAHAMSIC

MEMBER
1989 FORD BRONCO
6 CYL
4WD
MANUAL
149,000 MILES

4.9 ltr, NEW MAP sensor but have to unplug to get engine to run half way smooth. No error codes when hooked up to analyzer. Throttle position and most other sensor's replaced. Main computer swapped out with no change, also ICM. What else could it be?

Sunday, November 15th, 2009 AT 7:25 PM

1 Reply

KNOWYOURAUTO

MECHANIC
113 POSTS

I did not see where you have checked/adjusted the timing. This is the first step towards driveability problems when possible.

Next try cleaning the mass air flow (maF) sensor on the throttle body.

These also have a common problem of the IAC Idle air control sticking/wearing out. You mentioned that most of the other sensors were replaced but not specifically so I am adding this just in case. Most commonly it just causing poor idling and stalling at idle problems. Tap the top of the sensor with a screwdriver handle and see if it smooths out. Replace as needed.

Please post any follup questions or if none of these pan out we have many more ideas.

Good luck.

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Tuesday, November 17th, 2009 AT 5:20 PM