RustyDusty
Well-Known Member
- Joined
- May 13, 2021
- Messages
- 105
- Reaction score
- 14
- Location
- California
- Vehicle Year
- 1987
- Make / Model
- Ford Ranger
- Transmission
- Automatic
It's once again time to smog my 1987 ford ranger with the terrible 2.9. Its been idling rough and I can't seem to figure it out. When in park (especially when warmed up) the idle surges then drops real low and then surges then back real low rhythmically and sometimes it will stall. It will sometimes die when I put it in drive or reverse but once its idling in Drive or reverse it smooths out and is fine but if I put it back in park its back to the rhythmic up and down over and over. Does this point in any certain direction? is there a sensor or something the computer pays more attention to for idle while in park that is bypassed when its in drive?
All my searching on here led me to believe its a vacuum leak. I've gone through every hose I could find and replaced it with high temp silicone tubing. The throttle position sensor is new, the IAC is new, the ECT sensor is new, the MAP sensor is new, the air charge temperature sensor is new, new spark plugs and wires, new cap and rotor, new air filter, throttle body is clean, what am I missing?
I'm about to give up and take it to a shop for them to figure out but thought I'd ask you guys first.
Thanks
All my searching on here led me to believe its a vacuum leak. I've gone through every hose I could find and replaced it with high temp silicone tubing. The throttle position sensor is new, the IAC is new, the ECT sensor is new, the MAP sensor is new, the air charge temperature sensor is new, new spark plugs and wires, new cap and rotor, new air filter, throttle body is clean, what am I missing?
I'm about to give up and take it to a shop for them to figure out but thought I'd ask you guys first.
Thanks