Just throwing this out for discussion. If I get some help on it, all the better.

1983 300D with 237K on the clock.

First cold start of the morning or after sitting 6+ hours, it sounds like one or two cylinders is pinging/hammering. Sound goes away after about a mile of driving or after the motor warms up a bit. Any ideas.

Before anyone asks, the glow plugs and relay are new and the problem occurred before the new glow plugs were put in. A diesel purge was also done and all filters changed with no improvement.

No idea on if the injectors were ever changed out so it is probably due for new nozzles.

Overall the car runs great, starts up instantly and idles smoothly. On the road she gets about 27 MPG at 60 MPH or so.....Just the nagging nailing sound at start up.

Glenn

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2012 Mercedes ML350 Bluetec 102K (hers)
2005 Corvette 55K (fun car)
2002 VW Jetta TDI 238K (mine)
1998 Volvo S70 T5 Turbo 211K (kids)
1994 Ford F150 4WD 246K (firewood hauler)
1983 Mercedes 300D 384K (diesel commuter)