Welcome Visitor! Please take a few seconds and firehawk618
New Member
- Joined
- Aug 10, 2016
- Messages
- 23
- Reaction score
- 0
- Points
- 0
- Vehicle Year
- 1989
- Make / Model
- Ford
- Engine Size
- 2.9
- Transmission
- Manual
Just wanted to post this here so it might help someone in the future.
I picked up an 89' 2.9 on CL a few weeks ago.
Towed it home and tried to fire it up.
It wouldn't start unless I pumped the throttle really fast and when I did that it'd barely chug a bit but never fire up really.
It would run all day long if I sprayed ether in the intake.
After testing fuel pressure, ignition, IAT, ECT and checked for power / ground at the correct pins at the ECU I decided that the only thing I couldn't really test was the MAP sensor.
I disconnected the electrical connection at it and the truck started right up.
Slapped a new one in and it runs like a top.
Moral of the story is the MAP sensor on these things plays a HUGE roll in fueling. A malfunctioning one can exhibit behavior like there's no fuel pressure and such.
Hope this helps someone.
I picked up an 89' 2.9 on CL a few weeks ago.
Towed it home and tried to fire it up.
It wouldn't start unless I pumped the throttle really fast and when I did that it'd barely chug a bit but never fire up really.
It would run all day long if I sprayed ether in the intake.
After testing fuel pressure, ignition, IAT, ECT and checked for power / ground at the correct pins at the ECU I decided that the only thing I couldn't really test was the MAP sensor.
I disconnected the electrical connection at it and the truck started right up.
Slapped a new one in and it runs like a top.
Moral of the story is the MAP sensor on these things plays a HUGE roll in fueling. A malfunctioning one can exhibit behavior like there's no fuel pressure and such.
Hope this helps someone.
