Jesse East
SDD Junior Member
My 99 7.3 Crew Dually F 350 (only 80K miles) has always fired up smoothly during the winter months here in Virginia until this winter.
Granted that we have some cold days in JAN (15f-20f in the am), but usually a couple cycles on the heaters is enough to get the truck going without any appreciable surge. If I know that it will be colder, I will use the plug in electric heater for 2-3 hours and the truck fires up smoothly.
This year when it is really cold, even with 3 or 4 ignition cycles on the heater, the engine fires up OK, but the RPMs will surge up & down every second, until it warms up----about a minute.
The only thing that is different this winter is that I had to replace the CPS sensor last spring, and I had to splice some wires leading to the sensor that were frayed from the diesel vibration---but the engine runs well once cranked after that fix.
Any guesses about what might be happening? Jesse East
Granted that we have some cold days in JAN (15f-20f in the am), but usually a couple cycles on the heaters is enough to get the truck going without any appreciable surge. If I know that it will be colder, I will use the plug in electric heater for 2-3 hours and the truck fires up smoothly.
This year when it is really cold, even with 3 or 4 ignition cycles on the heater, the engine fires up OK, but the RPMs will surge up & down every second, until it warms up----about a minute.
The only thing that is different this winter is that I had to replace the CPS sensor last spring, and I had to splice some wires leading to the sensor that were frayed from the diesel vibration---but the engine runs well once cranked after that fix.
Any guesses about what might be happening? Jesse East
