Morning folks. I've got a 97 3/4 ton, AT, with 550,000+ miles on it. The problem I'm having is this: When the ambient temp is above 90*, and I engage the AC, it works well. Until I
come to a stop. The engine is idling like it's hitting on 5 cylinders. The sound coming from it is also like a water pump cavetating, trying to pump air. (retired fireman) When I shut off the
AC, the cavatation stops, but the engine still runs very ruff! This syndrome never appears when the engine is cold, and the ambient temp is cool. Obviously I'm not running the AC
either. The engine temp itself runs around 180*-190*. The fan engages and keeps it cool. I just replaced the radiator and condenser a month ago because they were old and beat.
One event that happened for the first time when I pulled into a fuel stop, was the fuel gauge needle dropped to empty and then came back to it's normal read.
This has happened 3 times now when I come to a stop with transmission in gear and AC compressor running. Take it out of gear with AC off, and the noise goes away, but idle is really ragged!
i took the trk to a diesel shop in Ca., and they spent half a day diagnosing it. They knew I didn't have the time to let them tear into it, just give me their thots. They came up with some
possibilities: tired P-pump, bad injector, or bad sending unit and pick up tube in tank. i replaced all fuel lines also before the trip.
One last thing. The truck has had a very rhythmic drone coming from the engine or? Gotten louder over the last year. Unrelated? Thx folks for any help you can offer. Gator
PS: I ran the trk today with full AC on in 86* temp. Nothing! Ran and idled fine................
come to a stop. The engine is idling like it's hitting on 5 cylinders. The sound coming from it is also like a water pump cavetating, trying to pump air. (retired fireman) When I shut off the
AC, the cavatation stops, but the engine still runs very ruff! This syndrome never appears when the engine is cold, and the ambient temp is cool. Obviously I'm not running the AC
either. The engine temp itself runs around 180*-190*. The fan engages and keeps it cool. I just replaced the radiator and condenser a month ago because they were old and beat.
One event that happened for the first time when I pulled into a fuel stop, was the fuel gauge needle dropped to empty and then came back to it's normal read.
This has happened 3 times now when I come to a stop with transmission in gear and AC compressor running. Take it out of gear with AC off, and the noise goes away, but idle is really ragged!
i took the trk to a diesel shop in Ca., and they spent half a day diagnosing it. They knew I didn't have the time to let them tear into it, just give me their thots. They came up with some
possibilities: tired P-pump, bad injector, or bad sending unit and pick up tube in tank. i replaced all fuel lines also before the trip.
One last thing. The truck has had a very rhythmic drone coming from the engine or? Gotten louder over the last year. Unrelated? Thx folks for any help you can offer. Gator
PS: I ran the trk today with full AC on in 86* temp. Nothing! Ran and idled fine................