murkinstock
Well-Known Member
- Joined
- April 8, 2013
- Messages
- 308
- Reaction score
- 10
- City, State
- Salem, Oregon
- Year, Model & Trim Level
- '99 Explorer Sport
Hi everyone. Ive had this issue with my truck for forever. It even has a completely different engine now, but it's still running lean while idling. (according to the long term fuel trim)
The slightest but of throttle, and it disappears.
Otherwise it drives normal, sounds great, just worse MPG than I believe it should have.
I know I know, you're thinking, aha! Vacuum leak! Well that's what I've thought too, but I've tried EVERYTHING to track down vacuum leaks, to no avail. The only thing I haven't done, is replace the maf or idle control valve, because I want to be sure it's the problem.
Tried smoke, I've sprayed everything! I've removed vacuum lines, and plugged them to see if the fuel trims would go normal, and nothing. The canister purge on the throttle body, nothing. I've cleaned the throttle body and maf, nothing. I've reset the ecu countless times.
I'm beginning to think, it's just kind of its thing, and there's nothing that will fix it. Maybe a complete new wiring harness, and ecu? Idk.
Any thoughts? It is a mystery!
The slightest but of throttle, and it disappears.
Otherwise it drives normal, sounds great, just worse MPG than I believe it should have.
I know I know, you're thinking, aha! Vacuum leak! Well that's what I've thought too, but I've tried EVERYTHING to track down vacuum leaks, to no avail. The only thing I haven't done, is replace the maf or idle control valve, because I want to be sure it's the problem.
Tried smoke, I've sprayed everything! I've removed vacuum lines, and plugged them to see if the fuel trims would go normal, and nothing. The canister purge on the throttle body, nothing. I've cleaned the throttle body and maf, nothing. I've reset the ecu countless times.
I'm beginning to think, it's just kind of its thing, and there's nothing that will fix it. Maybe a complete new wiring harness, and ecu? Idk.
Any thoughts? It is a mystery!