Nailing question?

[79-240d-project]

I just ran a can of LM diesel purge thru the 240D and what a difference. Nailing stopped and the engine sounded great.

When I put the fuel lines back on for a test spin, the nailing returned.

Any thoughts?

[kerry]

Had similar experience, although I'm not sure I'd call the sound in my car 'nailing'. It seems to me that the engine runs much quieter on purge.

[psfred]

Deisel Purge had a much higher cetane rating than normal diesel fuel.

If the nailing stops with the Purge and returns immediately, time to get the injectors checked -- opening pressure or pattern may be bad, and you need new nozzles.

Otherwise, it's compression check time.

Check chain stretch and injection timing, too.

Peter

[79-240d-project]

I just changed out my injectors, oh baby, what a difference. I tried to change out just the 2 that I determined to be the cause of the nailing but the engine ran really rough. So, I changed out all 4 and what a difference. I know for sure I had 2 bad ones, perhaps 3. Seems like I gained a new motor with an extra piston. Lots of power, at least for a 240D. Smoke on start up is greatly diminished, it is much quieter, and lots more power. Need to find some fuel return hose to replace the old ones. I reused the old ones and got a few small leaks. Here's to another 200k of motoring with these new injectors.