Glow plugs or bad fuel? - Page 2 - PeachParts Mercedes-Benz Forum

captainmonk · #16 02-06-2007, 05:56 PM

so i guess if humidity index is too high your car wont start?

toomany MBZ · #17 02-06-2007, 06:20 PM

I read here somewhere to start in coldness, turn key till light comes on, wait till you here a click, 30 seconds, the GP light will have gone out before then, engage starter with 1/4 throttle applied. This works for me, probably did not need throttle, single digit temp. The CD, that is, the SD refuses to start regardless. Test plugs with OHM meter at relay in box with fuse strip. Just unplug, + to numbered GP, - to ground, I use PS cap. Low numbers, better. One of mine read 70, the others 2, replaced all as precaution. Bosch, $10 each at Auto Zone... Okay, I've heard wind chill will lower temp sooner than no wind, yet temp will not be any lower on inanimate objects. http://wikipedia.org anyone?

gregszustak · #18 02-07-2007, 10:18 AM

Little warmer today, still started crappy.
With advice from our friends in the warmer climates (getting a better education) I can rule out wind chill.
12 volts across all glow plugs, may be carboned up from driving like an old man in the snow, just going to yank 'em and change 'em.

rrgrassi · #19 02-07-2007, 10:58 AM

Quote:

Originally Posted by captainmonk

so i guess if humidity index is too high your car wont start?

Car starts fine. It me that refuses to start.

Greg, make sure you ream out the GP holes.

Magoo · #20 02-07-2007, 11:15 AM

Quote:

Originally Posted by probear

"Wind Chill" is solely based on what the temperature feels like on your skin. IE., the speed in which your body can loose heat. The faster the wind, the faster your body can loose heat when exposed.
Cars, and anything else inanimate will only chill to the OAT and no lower. With that in mind, if the wind is blowing, they will get to OAT faster, but will not go lower than the ambient temperature.
The effect on your water pipes is because the wind pushes the boundry layer of air away, or goes through the insulation quicker. Any wind will cool things off quicker, but no more than the temp of the air.

I think it's semantics- I understand about the "invented" wind chill term, but I don't buy that it doesn't affect inanimate objects. Wind on exposed water pipes, on a 25F ambient temp day/night will definitely supercool and cause to them freeze when they wouldn't normally freeze on a calm 25F day/night. By the same token, a car parked in a unheated garage at sub-freezing temps will start easier and be less prone to fuel gelling in the lines than the same car parked ouside in windy sub-freezing temps. Air movement pulls more heat out of the object.

I don't know if anyone commenting on this subject is basing their info on experiments or studies- I'm not. Just my observations based on personal experience. BTW- Wikipedia information is not necessarily fact- it's open-source, therefore subject to misinformation.

gregszustak · #21 02-08-2007, 11:55 AM

One bad glow plug, measured infinity. Idiot lite on dash was OK.
Made a rough start at -5F
Changed 'em all. 3 spares.
Thank you gentlemen for the input.

vstech · #22 02-08-2007, 12:13 PM

Quote:

Originally Posted by Magoo

I think it's semantics- I understand about the "invented" wind chill term, but I don't buy that it doesn't affect inanimate objects. Wind on exposed water pipes, on a 25F ambient temp day/night will definitely supercool and cause to them freeze when they wouldn't normally freeze on a calm 25F day/night. By the same token, a car parked in a unheated garage at sub-freezing temps will start easier and be less prone to fuel gelling in the lines than the same car parked ouside in windy sub-freezing temps. Air movement pulls more heat out of the object.

I don't know if anyone commenting on this subject is basing their info on experiments or studies- I'm not. Just my observations based on personal experience. BTW- Wikipedia information is not necessarily fact- it's open-source, therefore subject to misinformation.

actually, air movement pulls same amount of heat out of object as stagnant air but air movement will pull that heat out quicker. and water pipes get heat from the ground, or the heat envelope of the structure, so if the air is pulling out the heat faster than the heat source can supply it, you get frozen pipes.
John