Question about 1986 Volkswagen Golf
Distributor cap and rotor replaced lately? How about the coil to create spark? How did you check the wires? Wires break down, anything over 8K ohms resistance and those things are probably bad. When were the plugs replaced? Is the choke opening when warm like it should? If not it would explain alot also.
Posted on Apr 29, 2010
It may be a vacuum leak. Look at ALL of your vacuum hoses and make
sure they are all connected.
The fuel pump should only run when the engine or running or is being
cranked. You should be able to hear a "buzzzz…click" when you release the key after an unsuccessful start. The buzz comes from the pump, and the click comes from the fuel pump relay. Have a friend listen to see if the fuel pump is running while you crank. If not, perhaps the fuel pump relay is bad. Some fuel pump relays have their own fuse on top.
If so, check the fuse. Assuming that the spark is good, that there’s no water in the gas, and that there are no obvious vacuum or air leaks, there are a variety of causes for no start. You really need a good manual to troubleshoot this problem, preferably a Bentley manual.
Have you checked the cold-start enrichment system? That’s the first cause suggested in the manual. There is a single electronic injector in the manifold that enriches the mixture when the engine is cold. It’s energized by a so-called thermo-time switch. It closes a circuit when the engine is cold, and there is a heater element to warm it up quickly and open the circuit. The circuit energizes the injector. This system shoots a jolt of fuel that’s needed to get started from cold.
Get the manual to see how to test the system. You let the engine cool down, disconnect the wire from the distributor cap center post and connect it to ground, remove the injector and hold it into a deep glass jar while a friend turns over the engine for a little while. It should spray an even conical pattern of fuel for some few seconds, then shut off cleanly. Careful, as naturally the fuel mixture is very explosive.
Get the manual if you want to pursue it… Thermo-time switches have been known to pack it in, but infrequently. Engine heat can cook the wires after several years, though.
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Posted on Apr 29, 2010
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Posted on Jan 02, 2017
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