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mercedes diesel help needed


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I've got a 99 e300td I bought at auction, 160k miles, looks like a new car. It starts up easily at -30* and will run right up to redline easily. Here's the issue; at part throttle cruising about 50mph with cruise control on it will hesitate a bit and plume blue smoke out the tailpipe. Driving it with a heavy foot it never smokes. The hesitation is barely noticeable, but the smoke is. I changed the oil and filter with no improvement. Any help is appreciated.

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I honestly don't know what injection system it uses. I'll look more into it, but seems like their mechanical injection. That being said I'd be considering a alda or Ada adjustment issue. It's also possible that someone adjusted fueling and may require a bit of tuning. Another issue could be valve timing or injection timing - but I'd start with low boost fuel controls first.

 

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  • 10 months later...

Solved this mystery by accident - my wife put 10 gallons of 93 octane in it. She made it to our driveway (about 8 miles) before it stalled out. I drained the tank, changed the fuel filter, and it hasn't smoked since. I'm assuming the gasoline cleaned up a sticky injector. I waited 5000 miles to post this due to uncertainties of the damage that could happen putting gas in a diesel but it appears to only benefited the car. I don't recommend it, due to the whole shutting off and not restarting until you do a few hours of work thing. Lol.

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      Most shop owners would agree that the independent auto repair industry has been too cheap for too long regarding its pricing and labor rates. However, can we keep raising our labor rates and prices until we achieve the profit we desire and need? Is it that simple?
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