Good compression is just as important as spark, fuel, and air, thats the next thing that I'd check. Also, it would be a good idea to check the timming belt, make sure that all the marks line up. A timing light would show that the distributor is in time, but not the camshaft.

Andrew
1984 Westy "Speed Bump"
1996 VW Jetta Trek  "Little Beep" (the wife's car)

--- Matt Ratto <mratto@UCSD.EDU> wrote:
>Well, here I am again. Diesel - gas conversion. Gas motor is CIS (not CIS-E)
>from 1986 Golf (engine code GX).  I turn the car over and every now and
>again get a detonation - sometimes even a series, but can't get it running.
>I don't know what else to try at this point. Here's what I've tested:
>
>Spark - good jolt from the primary coil, tested electronic ignition module
>(faulty) and replaced it. New plugs, wires, good cap and rotor. Made sure of
>firing order, and used timing light to position the distributor so that
>timing is close to correct. Put the timing light also on other spark plug
>wires to make sure they were firing as well. (I was worried about the Hall
>sender.) So far so good.
>
>Gas - Replaced leaky run between intake manifold and CIS fuel distributor,
>plugged holes in intake, put vacuum lines on. Pulled injector #1 and #2 (but
>not 3 and 4) and verified fuel flow on cranking. Also tested cold-start and
>thermo-time switch - everything works. I pulled the idle mixture plug out
>and played a little with the allen screw adjustment but with little change.
>I'm pretty sure I'm getting gas into the cylinders - some of it is leaking
>out of the exhaust manifold (which is something that I am worried about - I
>thought that was pretty well torqued down.)
>
>Questions I have:
>
>First, how can I test that the mixture is right? Also, is it possible for
>the injectors to be firing and the system pressure be too low or possibly
>too high? I can't test that without some more money spent on test equipment.
>
>Second, I don't have the electronic component ( I think this is the KA
>Jetronic ECU) hooked up to the fuel distributor. I figured that without an
>oxygen sensor it won't make much difference for now. (as soon as I get my
>new exhaust this is all going in.) I'm also not sure how this unit effects
>the fuel distributor. I've been told that the engine will run without all of
>this - although it will probably need to be adjusted via the mixture screw
>because they tend to run lean without the ECU.
>
>Finally, can anyone think of anything else to test?
>
>thanks for any help,
>
>Matt
>
>-------------------------------------
>Matt Ratto
>Ph.D. Candidate
>University of California, San Diego
>mratto@ucsd.edu
>http://communication.ucsd.edu/mratto
>--------------------------------------

_____________________________________________________________
Free email, forums and features for events, clubs and cars. Show Pride in Your Ride with a yourname@vwmail.net address from http://www.vwmail.net