Quote:
Originally Posted by TWHansen
Advertised as running and driving on Craigslist for $475. Really couldn't pass it up at the price, just for the amusement (it's bound to be worth double that in parts at a minimum). Got it home (barely), it runs pig rich, won't start unless your foot is on the gas and even then it sounds like it's popping back into the air cleaner before it decides to fire on all cylinders. Doesn't like to idle, when it does it sort of "surges". Before we drove it home we found a pair of gloves wedged under the air cleaner. Hopefully they weren't there to keep vacuum pressure up!
Cursory research has suggested it's likely a trigger point / vacuum issue, and that points generally can be cleaned. I'm 100% green to Mercedes-Benzes but I'm keen to try to nurse this one to driveability.
Anyhow, what do you think? What things should I take a look at to sort out the fuel problem?
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One suggestion I have is that you change the engine oil ASAP - in case a lot of that extra fuel has got past the rings and into sump oil and thinned it out.
I have recently gone through the same exercise with rich running and surging; this condition is usually caused by one or two small faults out of a possible dozen??? If you can find somebody close by who has a proper running 450 Djet motor and would agree to swap/test individual components (like the EFI CPU & MAP), you could troubleshoot very cheaply.
Old Water & Air temp sensors fail a lot. Get a new Air temp sensor (screws into the air filter) they are quite cheap ($25??). Whilst troubleshooting just sit the new sensor on the motor & plug it into the wiring loom. Then you can unplug & take away the air-cleaner while you are testing, I found its easier when its out of the way.
Because vacuum is so important on the DJet, buy or borrow a Mityvac and test the MAP. I think this was the main problem with my engine.
For safety, inspect the rubber hoses on the fuel rail and replace if they are old or cracked.
Good luck with your project
Peter in Melbourne