opportunity to buy a 1979 300SD
#11
Any compression over 300 is fine. Sounds like glow plugs. You mention one is already out so I wouldn't be surprised if the others aren't far behind. One way to find out for sure is to pull start it. MB automatics have a rear pump so will start.about 30mph and put in drive. may take 1/4 mile or more but should start even if your injectors are worn. Worn injectors WILL cause hard starting. There is a wealth of info from a fellow with a shop in Northern Washington state. You can type in mercedessource (his internet name) He also posts videos on u-tube for DIY and explains ( in detail) how to fix things on these cars. Does this car have a block heater? Try plugging in for hour or 2 if it does have one
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