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#1
01-02-2011, 01:49 PM
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What does temp outside have to do wih idle
Greetings,
When it's above about 60 degrees I can keep my foot on the pedal until she warms up, and then she will idle o.k. When it's cold outside, about 30 degrees and colder, even after she warms up I still have to keep my foot on the pedal or she will die - she just struggles to idle. What could be causing this? Thanks for your help. Hugh Sr 1984 190d (W 201) 98,543 
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#2
01-02-2011, 02:01 PM
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diesel engines run by heat in the motor combusting the fuel. if it's cold, it's MUCH harder to keep it running. less heat = less energy, and a more difficult time building combustion.
the most likely issue is glow plugs not working properly, although, fuel distribution/filtration is just as likely.
__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!!  1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#3
01-02-2011, 02:52 PM
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Do you have summer fuel? When it gets cold out summer diesel can get thick and plug up the fuel filter, which can cause trouble idling.
-J
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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket  Tesla Model 3. 205,000 miles. Been to 48 states! Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels. 2014 Cadillac ELR 2013 Fiat 500E.
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#4
01-02-2011, 03:54 PM
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Quote:
Rough idle at start up when cold is fairly normal. But at operating temp you shouldn't have to keep your foot on the pedal to make it idle smoothly. Rough idle is can be caused by many things. Fuel quality and type, fuel filters, air filter, idle speed set too low, uneven compression numbers, or poorly operating injectors.
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Andrew '04 Jetta TDI Wagon  '82 300TD ~ Winnie ~ Sold '77 300D ~ Sold
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#5
01-02-2011, 08:22 PM
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Shouldn't the idle speed control take care of the temperature issue?
It sounds like it's not working. Is it called ELR or something like that on these engines?
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Michael LaFleur '05 E320 CDI - 86,000 miles '86 300SDL - 360,000 miles '85 300SD - 150,000 miles (sold) '89 190D - 120,000 miles (sold) '85 300SD - 317,000 miles (sold) '98 ML320 - 270,000 miles (sold) '75 300D - 170,000 miles (sold) '83 Harley Davidson FLTC (Broken again) :-( '61 Plymouth Valiant - 60k mikes 2004 Papillon (Oliver) 2005 Tzitzu (Griffon) 2009 Welsh Corgi (Buba) 
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#6
01-02-2011, 10:29 PM
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EDS not working might be the case... does the EDS raise the idle speed when it's cold out on my early cars? It does on my 350, a friend didn't recall that feature on his 300SDL.
-J
__________________
1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket Tesla Model 3. 205,000 miles. Been to 48 states! Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels. 2014 Cadillac ELR 2013 Fiat 500E.
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#8
01-03-2011, 11:10 AM
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The Electronic Diesel System computer controls the ELR idle speed actuator on the back of the injection pump. It's the round thing with a 2 wire plug on it.
-Jason
__________________
1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket Tesla Model 3. 205,000 miles. Been to 48 states! Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels. 2014 Cadillac ELR 2013 Fiat 500E.
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