Welcome Visitor! Please take a few seconds and 
- Joined
- Aug 7, 2007
- Messages
- 1,822
- Points
- 3,101
- City
- Costa Mesa, CA
- State - Country
- CA - USA
- Other
- 2004 Bronco Badlands
- Vehicle Year
- 2002
- Vehicle
- Ford Ranger
- Drive
- 4WD
- Engine
- 4.0 V6
- Transmission
- Manual
- Total Lift
- 1.5"
- Tire Size
- 33"
On a recent trip my 4.0 SOHC started doing some strange things when trying to maintain a constant speed. If I let up to slow a little it was like shutting off the engine. Then when I stepped on the gas pedal to gain speed it would not do anything until I stepped a little harder and it would surge forward. Once, I floored it to make a pass and the engine just booged down. I had been driving for a long distance when this happened. I needed to get gas, so I pulled off to fill up. It was difficult to drive on the streets. When I pulled up to the pump I pushed in on the clutch and the engine died. I filled up and checked under the hood to see if any vacuum hoses were loose or the PCV valve was secure. I disconnected the MAF connector and reconnected to make sure it was getting good contact. When I went to start it, it fired right up and had no further issues until about another 600 miles it started doing it again and went away on its own.
I considered the IAC but thought that would just create an idle issue. Could it be causing throttle control issues at higher rpm?
I had an issue after another fill up where the rpm hung a little high while shifting and when I stepped on the gas pedal to accelerate after shifting it would not go until I stepped down a little more, it surged forward again. It cleared again after that, and I had no more issues for the rest of the trip home.
Is there anything else that could be causing it? I plan to use dielectric grease on the MAF connector to reduce any corrosion on the contact pins that may cause a bad contact.
I considered the IAC but thought that would just create an idle issue. Could it be causing throttle control issues at higher rpm?
I had an issue after another fill up where the rpm hung a little high while shifting and when I stepped on the gas pedal to accelerate after shifting it would not go until I stepped down a little more, it surged forward again. It cleared again after that, and I had no more issues for the rest of the trip home.
Is there anything else that could be causing it? I plan to use dielectric grease on the MAF connector to reduce any corrosion on the contact pins that may cause a bad contact.
Last edited:
