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Re: 1985 Volkswagen Diesel Glow Plugs Replacement
Your glow plugs are 4 small screw into the block type units that are easy to change out. There is an electrical strip that is connected to the top of each glow plug. take the nut off and remove the wire. Next, use a 10mm deep socket to remove the glow plug itsself. Simply reverse the order. Do not over tighten. there should be a torque spec on them but I don't remember what it is.
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the fuel pump and timing belt are not components for spark did you check distributor- points -coil -plugs-wires ignition switch -fuses and relays ----didnt specify engine if diesel need to check glow plugs
I would try changing your fuel filter. Inspect the fuel lines for leaks. Air getting in the line would cause fuel to flow back into the tank. I really suspect that the long cranking time may be a problem not with the fuel system but with the glow plugs, You probably need to replace the plugs as they are not pre-heating the combustion chamber properly to allow ignition of the diesel fuel. To start a diesel motor with out glow plugs you have to crank the motor until enough heat is generated to ignite the fuel. Glow plugs are not very expensive and fairly easy to change your self.
the glow plugs are bad when replacing replace the wiring harness as well any ford dealer will not replace just the glow plugs, i know i used to be there diesel mechanic.this is the reason it will start with the block heater is pluged in
first thing to check is voltage to glow plugs on the start cycle, it should be 12 volts or better, if good the do a resistance test on the glow plugs any burnt plugs will not give you a reading, they should all read about the same
A glow plug is a small heating element in the cylinder. It heats the diesel so that starting can be made easy. Is your car standing in the open frozen parking If yes, then it would require a lot of battery power to first heat all the cylinders and then turn the engine to start. What we do in such conditions is to light up some fire under the car and heat the fuel system enough for the diesel to warm up a little and thus save the battery for glow plugs. Generally, all vehicles have an indicator light which comes on when the glow plugs are ready for starting. The diesel will ignite on compression, but it has to reach the cylinder and thus has to be flowing. In cold it freezes and hence the need for glow plugs and the heat. If it is parked in heated parking then the need for glow plugs decreases.
Probably have one or more glow plugs bad...- There is a testing method, and I think they are easy to replace - when the temperature outdoors changes, you'll almost have to replace them, as you'll about never get a diesel started in the cold otherwise -...
DEPENDING HOW COLD OUT IT IS DIESELS DONT LIKE TO START IN COLD WHEATHER UNLESS THE GLOW PLUGS ARE WARM THIS IS THE REASON FOR PLUGGING DIESELS IN MOST WONT START IF ITS COLD OUT IF ITS NOT THAT COLD OUT IT SHOULD START IF YOU HAVE ENOUGH BATTERY POWER MAYBE THERES NOT ENOUGH FUEL GETTING UP TO THE THROTTLE BODY HOPE THIS HELPS