Date: Sat, 23 May 1998 09:09:58 -0500
Reply-To: Darrell Boehler <dboehler@TAOS.MIDWEST.NET>
Sender: Vanagon Mailing List <Vanagon@vanagon.com>
From: Darrell Boehler <dboehler@TAOS.MIDWEST.NET>
Subject: Re: I'm stumped! (misfire)
Content-Type: text/plain; charset="iso-8859-1"
---------------------
Hi Eric,
You have done a great job trying to isolate the miss. One thing that
may help you find it is to remove one fi injector plug at a time and see if
all cylinders drop the rpm and stumble about the same amount. You should
locate the weak one this way. If yours is a California van and has an ego
sensor open the ego connector before pulling the injector plug. I would
assume yours is a national as you mention it had an afm that caused a
running rich condition and a California afm / ecu won't run rich if the ego
is functional.
Darrell
-----Original Message-----
From: Eric Schmedlin <elv15@ROCKETMAIL.COM>
To: Vanagon@VANAGON.COM <Vanagon@VANAGON.COM>
Date: Saturday, May 23, 1998 7:33 AM
Subject: I'm stumped! (misfire)
>Hello Everyone,
>
>I have a problem that has got me stumped. I have an
>82 Westy which has a misfire, both at idle and at rpm.
>I have a GEX (rebuilt?)engine. My van has 136k? on
>the speedo. Don't know how may miles on the engine
>but am guessing around 50k from the looks inside the
>valve covers.
>
>So far to correct this miss I have tried the following:
>1. Tune up(new cap, rotor, points, condenser, wires,
>plugs, air filter.) set timing 7.5 BTDC. Adjusted
>valves.
>2. Dismantled and lubed breaker plate and mechanical
>advance in distributor.
>3. Adjusted air flow meter on an emissions machine.
>Mine was tampered with by the PO and was running VERY
>rich. It cleaned up pretty good though.
>4. Also, tried another air flow meter and with the
>AFM disconnected. Just to make sure. Still had the
>miss.
>5. Checked FI wiring. Especially #11. Ran separate
>wire from #11 multiconnector to the body.
>6. Checked compression and did leakdown test. Both
>good.
>7. Checked fuel pressure at idle and at rpm. both good.
>8. Checked injectors. Seem to have a good spray
>pattern. Possible that one is sticking and so
>ordered new ones anyway. (thanks Ron.)
>9. Set Full throttle enrichment switch.
>10. New cylinder head temp sender.
>11. Checked for vacuum leaks. Replaced a few hoses.
>still might be a leak somewhere...but I think I was
>pretty thorough. (of interest, found a screw inside
>a vacuum line!. It was between the deceleration
>valve and the fuel pressure regulator. Had to have
>been put there on purpose. Hmmm.)
>12. The auxiliary air regulator seems to be fine.
>The cold start valve is fine.
>13. The EGR is disconnected and plugged.
>14. I did have a problem with a lifter which was
>collapsing, but fixed that. Cam seems to be ok. (I
>would think that if the cam was bad the miss would be
>more regular. But it misses randomly. I can really
>feel the miss when I drive. and you can hear it when
>you listen to the engine both at idle and at
>speed.[it's hard to hear when I'm driving])
>
>I have had some local mechanics help me diagnose what
>the problem could be...but they are stumped too!
>If anyone of you has any clue as to where to turn
>next, PLEASE LET ME KNOW! I am ready to send this
>thing to the compactor! I think my van has a
>curse...it certianly has me cursing!
>
>
>Thanks for reading :)
>I really just need to share my frustrations!
>
>Eric
>
>
>
>
>
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>
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