Runaway Diesl Pickup
My 1980 Diesel rabbit pickup runs fine unless you are driving over 60-65 mph for a while. It will begin to pour out black smoke and accelerate uncontrollably. If I brake to slow the engine it will stop smoking and run fine. If you shut the key off it will stop the engine but when you restart the engine races. I thought it was burning engine oil due to bad valve seals or rings, but it does shut off with the key so I think it may be another issue. Is there anything in the injector pump that could be causing the issue?
Last edited by blevans; 05-30-2011 at 12:34 PM.
I don't know much about the older diesels but ill try and help. The newer ones have a vacuum actuated plate that shuts off air supply when the key is turned off. I'm assuming you DO NOT have this? If not then I assume you have ONLY the diesel shut off valve on the pump. If this is the case I'm going to have to assume whatever controls the fuel being injected has a leaky internal seal. Let a pro chime in but that would be my first though on this.
2012 Jetta, 2010 Tiguan 4mo.
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Thank you very much. I think it only has the valve on the pump but I am going to check into it to see if it has the other valve as well.
Do you have the Camshaft baffle installed? These are stock on turbo engines but realy help a high mileage / high blow by engine from blowing oil into the intake manifold. High rpm and oil temps realy throw a lot of oil around in the valve cover and then blowby pushes it into the intake. Pull your air filter and look for signs of oil. $25 part and $10 gasket.
You have a Bosch VE injector pump that can not put out enough fuel at 3000 rpm's to smoke unless it was modified or it is 115 deg at 10,000 ft. The addition of oil with the fuel and air makes an over rich condition......SMOKE and torque.. Oil is not atomized so it will not run on oil alone at low rpm's. It needs the blast of super heated gas from the precombustion chamber to burn.
When this happens turn ignition of and look for white smoke......oil.
I <3 diesels. They tell what is wrong with them.
Last edited by Harpersprops; 06-16-2011 at 07:12 PM.
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