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Old 01-11-2015, 05:36 PM
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whunter whunter is offline
Join Date: Dec 2003
Location: Metro Detroit, Michigan
Posts: 17,384

I resolved the issues a few days after the last post, and have been happily driving this vehicle.

This changed 1-9-2015.

Due to COLD weather, it has been running/idling 5 days = not turned off.

Preparing Leave work 1-9-2015, the idle was rough / stumbling.

I shut down for quick (safety) fluid checks:

#1. The engine temp was 75 C.
#2. Removed the radiator cap, no heat waves / steam.
#3. The radiator cap rubber seal (inside the radiator tank) had heavy frost.
#4. The engine oil level was a pint low, ignored = oil change next week.
#5. The washer fluid was semi frozen slush, added rubbing alcohol.
#6. Inspected the alternator / water pump drive belt = GOOD.

It re-started OK.
The idle was still rough.
Took off for work, throttle response was bad/poor as if it was a total COLD start.
I struggled to reach / maintain 65 MPH on the drive to work.
The power seemed to reduce further as I neared work.

(I know older forum members are chuckling, as you know what happened).

I stopped at the fuel station in front of work, and added two quarts of kerosene to the fuel tank.

By lunch time, the ambient temperature had dropped another 9 F, the engine temp was 75 C, and the car was happily clattering.
The idle was perfect, and all power was back.

The cause of this annoyance = fuel waxing.
Diesel fuel is prone to waxing or gelling in cold weather

ASE Master Mechanic

Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Heat exchanger durability.
HV-A/C Climate Control.
Vehicle build.
Fleet Durability
Technical Quality Auditor.
Automotive Technical Writer

1985 300SD
1983 300D
1984 190D
2003 Volvo V70
2002 Honda Civic
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