QuestionMy 300TD shakes badly on idle, and it appears that there may be something specific going on that causes the engine to buck, but what that something specific is, I don't know. I wonder if you can help me diagnose it. The odometer has 260,000 miles on it, and I don't know if this is the original engine, but I suppose it is. First, I have done these diagnostic/maintenance steps:
1. Clean fuel tank, make sure no fuel restriction.
2. Adjust valves.
3. Change fuel filters, make sure clog is not starving engine of fuel.
4. 2 applications of Lucas Upper Cylinder Cleaner with Injector Cleaner
4. Ran 2 cans of Liqui Moly Diesel Purge through engine using fuel system bypass method.
While doing the Diesel Purge, I captured audio of the engine sounds, which are distinctive. A vicious tick often occurs on a period of about 2/3rds of a second, making the engine shudder. What do you think is going on? I should mention that the engine runs smoothly and knock-free if I just increase idle speed a little bit, and it sounds good and runs relatively smoke free at normal speeds.
Could you have a listen to the audio file, below, and give an opinion of what it might be or what a next step might be? Thanks!
Webb Mealy
http://www.selftest.net/media/RoughIdleSounds.mp3
AnswerI listened to the noise, I would look immediately at your timing chain and measure for stretch. Sounds like chain slap , ignored can be catastrophic.
Could also be an injector that is not pulsing, or injection pump. Use a mechanics stethoscope and listen over each area I have mentioned
