I have a 92 Golf Diesel 1.6L that likes to stumble, or miss, at high rpms. I also think that the power is lessened too but this is hard to conclusively prove. But when the cold start is pulled out the car will run fine. I have checked the timing belt, replaced the injectors and there is no air in the fuel lines. If anyone has some ideas let me know? Also does anyone know if driving all the time with the cold start pulled out is hard on MPG or anything else? Cause I am getting to that point on long drives or hills. Thanks
Thanks for all the responses. The timing belt is new but the tensioner I have never replaced. The tensioner is also pretty well maxed out to get close to the right tension. I have only owned the car for a year (20,000km) and the motor is up there at 450,000km. I have alot of faith in VW diesels though but it could be many things at this point. Is there anyway to test the injection pump? The fuel filter was also changed when I got the car. I am going to try to find a diesel compression tester and see what I can get. I don't have the indicator to check the exact timing on the pump but I am looking for one as well. Thanks again
I am a pain in the ass, but one thing I am is the king of getting piece of crap VW diesels to run without paying too much. They are the bomb. I have faith too. I regularly drive 100 miles to visit my brother, at 70 mph, in an
85 golf diesel, with 200,000 mi. that's been overspeeded twice, run low on oil, and the trans whirrs, and makes people back off from the oil burning. Instead of taking my 2005 Toyota Echo. There's not much you can check on the pump without the appropriate Bosch proprietary rights protected Test equipment and books. There's plenty of high quality used pumps available. You need to get the pump timing up at the upper limit. At least check it. If its out of range, put it in. If its low that may be your problem. If its in , put it at the top. Do not go over. Or you will have cold starting issues below 20 degrees. You need to know your timings nuts on. I mean pump, cam and crank locked down. plenty of people change belts and don't set it due to lack of tools. Or you're wasting your time. You could check your compression FYI, maybe a cylinders low. or if you're thinking of rebuilding the motor.
Thanks for the thoughts. It is good to hear someone else's ideas on it. I am going to get checking the timing on the pump then follow your advice to the pump then motor. I had the idea but wanted to pass it by you guys first.
Something you may be able to replace yourself is the shaft seal. However that usually causes the pump to loose prime when sitting resulting in a slow start. If you think it's the pump something I've done several times with very good results is to add a inexpensive generic gasoline electric fuel pump just before going into the filter. The injector pump returns any excess fuel to the tank so there's no problems with too much. I just wire them up to the stop solenoid. It'll run like new because it's getting the proper amount of fuel.
There is a screen in the tank, like a sieve but hardly a filter, that does need the sludge wiped off once every ten years. I appears when you take out the fuel line pickup flange from the top of the tank. I have kept VW diesels until 17 years old or more, and the "filter" needs attention after
12 or so. It has the fault you describe, when all the others have been eliminated.
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