Hi,
I have a 1988 Jetta (non-GLI). After driving it a brief time, it gets rough and looses power. All the plugs are getting a spark, because I can see the spark if I pull off the plug wire. First, the cylinders on the passenger side quit working (no change in engine when the wires are pulled off) then they all quit firing. It eventually quits running at all. If left over night, it will work for a while when first started.
When it has quit running, if I squirt ether into the intake manifold through a vacuum cap I pulled off, the car will briefly run fine. From this I decided that the fuel system must be at fault. (I wasted some money on new plugs and wires and cap/rotor first.)
I can hear the fuel pump run when I turn the key.
Is there a way I can figure out whether it is the fuel pump or the injectors ? The car is getting to the point that I might junk it if it is something as expensive as new injectors, but I would replace the fuel pump if that was it. Can I measure the resistence of the fuel pump electrical terminals or something ?
--Rob
P.S. My Haynes manual does not mention an in-tank fuel pump, just the one external to the fuel tank. However someone at Autozone told me that they sell an in-tank and an external pump. Is there an in-tank pump ?