See if you can't find an article written by hugie_at_lindy.stanford.edu posted June 13, 1994 entitled "1981 Van running rich, FI problems SOLVED" in the archives. It may explain the problem. ---------------------------------------------------------------- Tom Young Lafayette, CA 94549 ---------------------------------------------------------------- ----- Original Message ----- From: "vanagon" <vanagon@MAIL.ABSOLUTEARTS.COM> To: <vanagon@GERRY.VANAGON.COM> Sent: Friday, October 13, 2006 9:02 AM Subject: 89 backfires, sputters when warm. MYSTERY problem!!
>I am reposting this question because NOBODY has been able to fix it! > > I have been completely clueless for almost a year by now about my 89 > Vanagon. > I have never had a problem with this it and rebuilt the engine about 3k > ago. > It ran beautifully until one day it just stopped running right. > > It idles and accelerates fine when cold. Just as it gets warm it starts > coughing and backfiring through the air intake when you press on the gas > like > if you would accelerate from a red light. It sounds like it is not getting > the > right mixture. It smells weird. It just won't smoothly accelerate and rev > up. > You obviously cannot drive the van this way. It will hesitate like crazy, > sometimes it will backfire through the air intake other times it will rev > up > a little. > > The computer will reset itself and it will run fine for about 30 seconds > when > quickly turning off the ignition and back on again. IT IS NOT A mechanical > issue because compression and all are fine. > > All electrical test as per official service manual check out fine, > computer > checks out fine, new o2 sensor, fuel pressure fine, injectors brand new, > coil > brand new, distributor brand new, temp sensors new, grounds to chasis > fine, > all resistance tests are fine, relays like fuel, etc. test fine, new > plugs, > wires all new, new gasoline as well... It must be electrical but where??? > > Of course when grounding the o2 sensor the motor will run because it > enriches > the mixture... but when hooked up correctly it will not. continuity > between o2 > sensor and brain is fine, too. resistance of o2 sensor is fine, too. temp > sensor at intake is fine as well, > > Does anyone have an idea what this problem is??? NOBODY seems to know > what > the problem is... I wonder if we have a real expert here!!! |
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