FIND
Explorer Addict
- Joined
- December 27, 2009
- Messages
- 3,859
- Reaction score
- 17
- City, State
- Vermillion, SD
- Year, Model & Trim Level
- 99 XLT V8 AWD
Was driving home from the grocery store today, truck wanted to keep revving after I got up to speed. I accelerated to 45 (not sudden acceleration either) and when I took my foot off the pedal to coast down when someone was turning in front of me, I noticed the truck didn't drop RPMs. I pulled back against the pedal and the RPMs still didnt drop, shifted to neutral and the RPMs jumped to 3000. Shifted back to drive, turned off onto my street popped the hood to check throttle. TB was in the mostly closed position. I pushed the throttle body to be sure it was fully at the stop and the RPMs still woudnt drop. Prior to accelerating to speed, the truck had no issues with RPMs.
RPMs stay above 2700 idling in neutral or park. Disconnected the MAF, RPMs dropped seriously then started climbing slightly. reconnected, RPMs jumped right back up. Disconnected IACV, RPMs stumbled momentarily. I had noticed a hissing noise so I was looking around for a vacuum leak. After searching for a couple minutes or so, I heard a bursting noise and the hissing got much louder. I looked up and saw the steam pouring out the side of the radiator. Truck wasnt overheating. Radiator had a large crack in the side of it.
Any ideas what is causing the high idle? No vacuum leaks, IACV is only a couple months old. Fuel pressure regulator was just replaced. MAF function is good. TPS is good. Truck is not equipped with EGR. Recently cleaned and Rebuilt injectors that are all functioning properly. Truck did not seem to be running overly rich. No CELs.
Has anyone experienced super high idle in a situation where the coolant drops really low? Air in system near sending unit?
RPMs stay above 2700 idling in neutral or park. Disconnected the MAF, RPMs dropped seriously then started climbing slightly. reconnected, RPMs jumped right back up. Disconnected IACV, RPMs stumbled momentarily. I had noticed a hissing noise so I was looking around for a vacuum leak. After searching for a couple minutes or so, I heard a bursting noise and the hissing got much louder. I looked up and saw the steam pouring out the side of the radiator. Truck wasnt overheating. Radiator had a large crack in the side of it.
Any ideas what is causing the high idle? No vacuum leaks, IACV is only a couple months old. Fuel pressure regulator was just replaced. MAF function is good. TPS is good. Truck is not equipped with EGR. Recently cleaned and Rebuilt injectors that are all functioning properly. Truck did not seem to be running overly rich. No CELs.
Has anyone experienced super high idle in a situation where the coolant drops really low? Air in system near sending unit?