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Old 06-19-2000, 11:55 AM
Posts: n/a
Have the compression checked! My '84 300D began to start hard, smoke alot, and sh-sh-sh-shake at idle. I spent time and money on the idle rack dampening srew, fuel filters, start of delivery timing adjustment, injectors, etc. before I threw up my hands in frustration and took it in for a compression check. The #3 cylinder made less than 200psi. One valve job later and I was back in business. The valve guides were worn on cyl. #3, preventing the valves from seating properly. I was told that even at 200K miles, there isn't much call for valve work on these motors, and I wouldn't jump to tearing off the head without the recommendation of a trusted and qualified mechanic, but the symptoms sound familiar.
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