VWDiesel.net The IDI, TDI, and mTDI source.
General Information => Troubleshooting => Topic started by: therast on August 31, 2009, 01:27:02 pm
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I have had 17 VW diesels. I have had engines all apart have been in Injection pumps have and injectors, i adjust my own valves etc. I am not saying this to look like a hero just to equate you with my mechanical aptitude. This problem stumps me. I have 2 vw diesels both NA. One is an 85 mechanical lifter and the other is a 91. I have had the 91 about 4 years and after owning it for about 18 months I noticed that I started getting a significant soot buildup on the trunk. The car burned ZERO oil. I had put a rabbit style fuel filter on it but have done that on many of my diesels with no issues. I loved the big bumper body so I decided to trensplant the great running m85 mech motor into my 91 body. The 85 motor didn't burn oil, had great acceleration and no soot. So i made the transplant and now the 85 motor produces soot and the 91 motor in the 85 body does not. The 91 body has always needed about 2 seconds of cranking to start unless it is the first start with glowplugs. I was frustrated as heck at Christmas so I ripped off the water separator under the car and plumbed the lines together. I am lost as heck. Swapping motors in 90 degree weather was not a bunch of fun and i still have the problem. Thanx for any help.
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Fuel line weirdness? Tank venting weirdness? 1cwt of soot still sitting in the exhaust, collapsing air intake pipework, something that is still with the car? Happy Puzzling. :P
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It's obviousy fuel feed related, why not get a lift pump and see if it helps. Advance and Autozone has them for 45-60 dollars, the $60
one by Mr. Gasket is Diesel rated and has a pressure rating of 4-7 lbs. They help eliminate those damn air bubbles too.
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I talked to a local truck diesel guy and he said check the return hose for blockage and I checked it against an 85 diesel I have and the 2 are pretty close. Any suggestions on how to check the fuel lines? I have looked and there is no visible leakage.