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Cold starting a diesel.
If you own a diesel long/old enough, you will eventually have a cold starting issue ..
What causes it, (several of these issues tend to occur together) : * Wrong viscosity engine oil - too thick for the temperature. * BAD and/or contaminated fuel...... * Plugged air filter. * Plugged trap oxidizer, (where applicable = if your car has one). * Air leak in the fuel system O-rings and hoses (cold contraction opening micro holes, possible damage from alternative fuels). * Primer pump air leak, (1985 and earlier engines). * Air leak Fuel pre-heater (1986 and newer engines). * Plugged filters or tank screen (filter and/or screen contracts sealing the few remaining micro holes). * Damaged steel fuel feed line, (pinched/crimped by road junk impact). * Bad fuel tank vent = hard vacuum in fuel tank. * Valves out of adjustment (1985 and earlier engines). * Bad Lift pump valves (cold thick fuel, chewed up plastic valve face). * Wear/damage fuel bypass valve = zero pressure to supply injection pump. * Bad glow plugs or heavy carbon on them. * Weak/bad starter. * Weak/bad battery, (a bad voltage regulator/alternator may contribute to this). * Damaged injectors, (generally leaking = flooding). * Injection pump wear/damage. * Bad injection timing. * Engine wear/damage = compression loss. Last edited by whunter; 12-06-2009 at 06:42 PM. |
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Links that may help you
Alternative fuel links (Diesel)
Air Intake Diesel Injection Engine Electrical Engine Mechanical Fuel Delivery Trap Oxidizer, LINKS thread http://www.peachparts.com/shopforum/showthread.php?t=229522 Related data: Ignition Cylinder Tumbler replacement; mixed diesel/gas http://www.peachparts.com/shopforum/showthread.php?p=1065596 Broken Neutral Safety Switch and replacing shifter bushings http://www.peachparts.com/shopforum/showthread.php?p=646647 Last edited by whunter; 12-06-2009 at 06:46 PM. |
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Not sure whether to thank you for such an excellent comprehensive list, or whether to go cry in my room over such a long list of things that may be wrong with regards to my recently-become-problematic 300sdl w126. for now i'll settle for thanks, so thanks.
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I do not see ' failure to follow the FSM instructions ' for leaving the glowplugs engaged for close to 45 seconds plus in a single ' heat' .....( ignore the light going out ) when my wagon started acting up this made all the difference. Amazing how smart those guys were that wrote the Factory Shop Manual !!!
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1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/showthread.php?threadid=10414 http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/showthread.php?t=156207&highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html |
#5
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Many of these will cause not only cold start issues, but general running issues, e.g., bad/contaminated fuel, damaged fuel feed line, fuel tank vent, injector/injector pump worn, and so on. Symptoms may be more prevalent when trying to cold start, but are not limited to that. I'd guess that if you have a cold start problem, you can look at this list and try to determine if any additional symptoms could clue you in to narrow down the cause. Perhaps this list with additional symptoms when engine is running would be helpful. Like what would be an additional symptom of Bad Injection Timing? Smokey exhaust? Poor acceleration? I'm not good enough at this game to get to the final round, but maybe some of the Jeopardy champs out there could help out. Remember to phrase your answer in the form of a question!
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mjk '84 300SD 119KMi (Liesl der Diesel) '84 300D 326KMi when the oil left (former parts car) '82 300SD 253KMi (new parts car) |
#6
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Answer
Have a GTG at your place, free food and drink always draws a crowd.
They will probably have your car running in a couple of hours.. |
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