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#1
02-12-2016, 09:30 AM
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no start with block heater w123
plugged in the car last night, got very cold, maybe 5 degrees F.
no start this morning with several glow plug cycles. tested the plug at the relay, getting around 1.5ohms on each plug. diesel giant says they should be less than 1 ohm, but seeing a lot of other opinions out there. seems like my fuel might have gelled, but isn't that what the heater is for? any way to check if the heater is working?
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1984 300CD 
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#2
02-12-2016, 09:34 AM
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pretty sure the heater is working. it was working yesterday as evidenced by snow melting on the hood. i think i can hear it sizzling right now.
glow plug relay fuse is new, i also replaced the relay at some point. light is working as usual.
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1984 300CD
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#3
02-12-2016, 10:19 AM
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Do not not trust ohmeter readings on low readings around 1 ohm. The readings are not accurate and not repeatable. If you have a 20 A digital ammeter, go from each pin of the glow plug connector harness to battery + terminal. It should surge to around 19 A and tapers to 10 A after 1 minute if the glow plug is good. Block heater may not do well heating gelled fuel in the IP so gelled fuel is a possibility for your no start. Good starter motor? Take a video of it when cranking. Did you have a battery charger plugged in with the block heater which is always a good idea. At single digit temps, your engine needs all the help it can get. Tomorrow Sat night is suppose to be single digit. I will try a cold start Sun morning w/o block heater. I think it will start since everything is in order and battery is on a trickle charger.
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85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked
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#4
02-12-2016, 11:28 AM
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i think my block heater plug needed cleaning and wasn't getting a good connection. my ohm meter seems pretty solid, zero's out when you touch the leads together. i'll check the amps later and plan on replacing the glow plugs.
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1984 300CD
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#5
02-12-2016, 11:47 AM
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Quote:
In my big diesel (6.2l) truck, if I don't change to a winter grade oil, you can hear the engine laboring to turn over fast enough to create compression, even with good glow plugs.
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Strelnik Invest in America: Buy a Congressman! 1950 170SD 1951 Citroen 11BN 1953 Citroen 11BNF limo 1953 220a project 1959 180D 1960 190D 1960 Borgward Isabella TS 2dr 1983 240D daily driver 1983 380SL 1990 350SDL daily driver alt 3 x Citroen DS21M, down from 5 3 x Citroen 2CV, down from 6
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