- Joined
- Aug 13, 2023
- Messages
- 19
- Reaction score
- 12
- Location
- Lititz, PA
- Vehicle Year
- 1993
- Make / Model
- Ranger XLT
- Engine Type
- 4.0 V6
- Transmission
- Automatic
- 2WD / 4WD
- 4WD
My 1988 2.9L idles fine. When I get it up over 2,200 rpm it will start to misfire.
I have a question about how a MAP sensor is supposed to act. I'm getting 5v on the power wire. 2.3v on the signal wire with the key on, motor off. If I start the motor, the signal wire stays at 2.3v even when I rev the engine. I assume from what I'm finding on YouTube that the signal should go down to 1.5v with the engine running and go up when you rev the engine.
I have a question about how a MAP sensor is supposed to act. I'm getting 5v on the power wire. 2.3v on the signal wire with the key on, motor off. If I start the motor, the signal wire stays at 2.3v even when I rev the engine. I assume from what I'm finding on YouTube that the signal should go down to 1.5v with the engine running and go up when you rev the engine.
- Are my results telling me my MAP sensor is bad?
- Would these results cause the misfire at higher rpms?