MrBanjo
11-13-2006, 10:10 PM
why do you think my 'burb runs so much better when it's cold out. below 30 and she runs like a champ. i have been driving her as a work truck for a few months, 60 miles round trip. in the past when i would accelerate she would miss and smoke. get her up to running speed and she would run fine. when it is below 30 no problems at all. i can even pull vail pass, 7 miles @ an average 7%.
the engine temp seems to be hanging out around 190 no matter what the temp is outside.
the other weird thing is how she shifts. under 30 and i barley feel the sift. when it was in the 60's and 70's i had to put the truck in nuetrual while rolling to get her to shift.
rock_shoes
11-13-2006, 10:13 PM
That doesn't make any sense to me. I wonder if anyone else has had similair issues? Does it get real hot when it's warmer out? Trans temp?
MrBanjo
11-13-2006, 10:22 PM
engine temp seems to be consistent. i don't know about the trans temp, no guage for that. should i?
farmer0_1
11-13-2006, 11:24 PM
when it is cold out do you hear it come off of fast idle advance.? maybe timing issue. just guessing.
MrBanjo
11-13-2006, 11:44 PM
not really, because it's always warm. i need to keep it plugged at all times because i'm redoing the glow system
High Sierra 2500
11-14-2006, 09:37 AM
Well, a few things come to mind...
For one thing, all engines produce more power in cold weather. This is because cold air is denser than warm air, therefore you get more air in the cylinders and can burn more fuel (sort of like the effect of a turbocharger or nitrous oxide, only on a much smaller scale).
Also, fuel viscosity changes as it gets colder... The colder it gets, the thicker your fuel will be. On trucks with worn injection pumps and/or injectors this can make it run better.
Transmissions tend to shift a little different when it is cold due to the change in the viscosity of the transmission fluid and the changes in clearances inside the transmission... That should go away once it gets warmed up pretty well, though. One note on that... Soft shifts are not good... If you can hardly feel it shift, it may be starting to slip. :eek: Also, since you do have a 700R4, a transmission temperature gauge would be a good idea... That way you can keep an eye on it. After all, many automatic transmission failures are the result of overheating...