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Date:         Thu, 5 Dec 2002 04:20:17 -0800
Reply-To:     Andrew <Andrew@VWMAIL.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Andrew <Andrew@VWMAIL.NET>
Subject:      Re: gas, spark, still no love
Comments: To: Matt Ratto <mratto@UCSD.EDU>
Content-Type: text/plain

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 >--------------------------------------

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