driving on ice with high idle,,,,
12-15-2010, 03:08 PM
#1
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driving on ice with high idle,,,,
my car has a strange behaviour
it takes long to get at temp, but that can be normal, mostly 20Km.
when not at temp the oilpressure stays at 5, also at idle, the idle when cold is to high (1200 to 1500rpm)
as soon as the temp is high enough the oilpressure drops to a normal reading and rpm drops to 700. at that point the oilpressure reacts with rpm. when cold the needle does not move a tiny bit.
the car is almost not driveble on snow or ice, especialy when cold with the high rpm. as soon as i put it in reverse the wheels start to spin in the snow. in drive the same. also the frontbrakes work faster than the back, so the back pusches the blocked frontwheels trough the snow unless i hit the brakes harder.so it is almost not possible to drive verry slow with the brakes pushed slightly , verry dangerous or impossible when cornering on ice.
i hit a fence when i wanted to corner up verry verry slowly on a icy driveway , luckely i hit the fence with the tire.
it takes long to get at temp, but that can be normal, mostly 20Km.
when not at temp the oilpressure stays at 5, also at idle, the idle when cold is to high (1200 to 1500rpm)
as soon as the temp is high enough the oilpressure drops to a normal reading and rpm drops to 700. at that point the oilpressure reacts with rpm. when cold the needle does not move a tiny bit.
the car is almost not driveble on snow or ice, especialy when cold with the high rpm. as soon as i put it in reverse the wheels start to spin in the snow. in drive the same. also the frontbrakes work faster than the back, so the back pusches the blocked frontwheels trough the snow unless i hit the brakes harder.so it is almost not possible to drive verry slow with the brakes pushed slightly , verry dangerous or impossible when cornering on ice.
i hit a fence when i wanted to corner up verry verry slowly on a icy driveway , luckely i hit the fence with the tire.
12-15-2010, 05:07 PM
#2
Rennlist Member
OK, forgive me if I'm telling you what you already know, but this indicates to me 1) you need to let it warm up fully before driving in such conditions, and 2) you may know this trick, but the next time you are heading straight for something, with wheels TURNED and brakes ON, but the car is still pushing straight forward, LET OFF the brakes! You'll turn immediately.
12-15-2010, 06:25 PM
#5
Three Wheelin'
The only thing I see out of the ordinary here is your high idle. Oil pressure situation sounds as a 928's should. You can easily adjust your idle speed as desired by way of a large adjustment screw on the front of your throttle housing. Despite the 50/50 weight balance, these things don't impress me in extreme winter weather either. Plus, all of that salt is probably good to keep as far away from a 26 year old car as possible.
12-15-2010, 06:28 PM
#6
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The cold idle is too high.
High performance tires turn to hard plastic below 40 deg F. The lack of traction even on cold dry pavement can be surprising.
The 928 does very well in snow with the proper tires - at least until the snow gets deep enough for the spoiler to start dragging...
High performance tires turn to hard plastic below 40 deg F. The lack of traction even on cold dry pavement can be surprising.
The 928 does very well in snow with the proper tires - at least until the snow gets deep enough for the spoiler to start dragging...
12-15-2010, 06:36 PM
#7
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Just put >500 miles on mine through the snow. It handled nicely, I would not hesitate to do so again. The only major concern for me was that my tires were summer tires with very little in the way of bite. It can be very easy to spin out in the snow.
Might want to consider tire chains.
Might want to consider tire chains.
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12-15-2010, 06:50 PM
#8
Electron Wrangler
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Given the clearances on 928's I'd say avoid chains & get a spare set of (not so wide) wheels with snow tires if you need to drive in the snow much... Body damage from flying chain ends would pay for the cheap wheels/tires pretty quickly...
Alan
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12-15-2010, 08:55 PM
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12-15-2010, 09:44 PM
#10
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I dont drive my 928 in winter for obvious reasons living in Western Canada but I do run All Season tyres in the event that if I do get caught in a spring or fall sudden storm. The car has performed very well and use 235 front and 275 rear widths.
As to your cold idle issue yes its very high and needs immediate attention. If you have to drive before fixing, which I dont recommend, get very used to moving the gear level in and out of neutral.
As to your cold idle issue yes its very high and needs immediate attention. If you have to drive before fixing, which I dont recommend, get very used to moving the gear level in and out of neutral.
12-15-2010, 09:47 PM
#11
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12-15-2010, 10:00 PM
#12
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sounds normal to me.
use the e-brake when the idle is high.
I think these cars work great in the snow and rain, with the right tires, and sometimes, without.
use the e-brake when the idle is high.
I think these cars work great in the snow and rain, with the right tires, and sometimes, without.
12-16-2010, 12:58 PM
#14
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ok, i try to lower idle speed, i thougt it wasnt adjustable on my car.
i dont have any vacuumleaks, so i thought something else was affecting idlespeed. 200 rpm lower would be fine to begin with
i have to drive the 928 this year in snowy conditions, i have my bike or the 928 or the riviera, i use the bike as soon as the road is free of snow and ice, the riviera is to expencive for winter use.
next winter i will drive something else in the snowy conditions.
its a combination of high idle, summertires and the fact that i dont have experiance driving in snow with a rear wheel driving car without elektronical stability stuff.
my wifes bmw drives trough snow like on trainrails. sps ...wintertires....
i dont have any vacuumleaks, so i thought something else was affecting idlespeed. 200 rpm lower would be fine to begin with
i have to drive the 928 this year in snowy conditions, i have my bike or the 928 or the riviera, i use the bike as soon as the road is free of snow and ice, the riviera is to expencive for winter use.
next winter i will drive something else in the snowy conditions.
its a combination of high idle, summertires and the fact that i dont have experiance driving in snow with a rear wheel driving car without elektronical stability stuff.
my wifes bmw drives trough snow like on trainrails. sps ...wintertires....
12-16-2010, 02:16 PM
#15
Burning Brakes
Check your throttle cable. Mine does this intermittently. manipulate the throttle by hand and see if it seats properly at idle. If it doesn't seat again. You can try to shoot some WD 40 down the sleeve of the cable
and work it back and forth.
May also want to try a tube down to the ISV. Start with WD40 start the car. Then brakekleen or similar and start the car. Then WD 40 again and start the car.
and work it back and forth.
May also want to try a tube down to the ISV. Start with WD40 start the car. Then brakekleen or similar and start the car. Then WD 40 again and start the car.