For an easy, innovative approach to check glow plugs see this thread.
easiest way to diagnose glow plug system - video
Do you have a clear line in the return to look for air? If it fires for a split second then dies that could be air.
Quote:
Originally Posted by coachgeo
Won't start in temps below 40 deg. (85 300sd)
Car often sits alot waiting for a day warm enough to drive it.
. Battery checked by CheapoZone and said it showed to be fine.
. New Glow plugs. All checked to get red at tip when powered before install. (well one is old but while in car it showed normal resistance. All others showed no resistance as in DEAD no contact) Now all show normal resitance when on car.
. Relay fuse shows power on both sides
Do not have an amp meter yet.
Wondering if something else Im not thinking about that would cause no start that the cold helps create such as cold temps can worsen poor contact in electrical connections
Since car often sits alot waiting for a day warm enough to drive it, I thought maybe it leaks in air. So other day it was warm but got same no start. Using 12v pump I put by tank... I primed the system at the filter. It started. BUTTTT...... on cold day..... this does not help; I tried.
Im baffled and desperate. This is my only legal transportation
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