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Date:         Mon, 4 Oct 2004 11:55:53 -0700
Reply-To:     Craig Oda <craigoda@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Craig Oda <craigoda@GMAIL.COM>
Subject:      Re: misfire - diagnosis of problem?
Comments: To: Ken Lewis <kdlewis_wasting_time@access4less.net>
In-Reply-To:  <003b01c4aa3c$6d74fe40$0100a8c0@korky>
Content-Type: text/plain; charset=US-ASCII

Ken, thanks for the information. I'm thinking that if it is either the intake or exhaust valves on cylinder 3, then a new head would solve the problem. If it is the ring, then I'll swap in another long block from a known working (but high mileage) vehicle and then contemplate more about the ring.

I have two known working heads in the garage and a complete engine gasket kit in the garage. One head has about 3,000 miles on it, the other has maybe 30,000 miles on it. I could swap the head on cylinders 3 and 4 first then see if that solves the problem. If not, try the other side.

I don't have an air compressor to try a leak down test. I suppose I could buy one since I want to get one anyway.

The van actualy runs pretty good. However, I have this fear that an exhaust valve is going bad and is going to break one day when I am way the heck in no-man's land. Of course, I'm also worried that I'll spend a weekend swapping the heads and then find out that the problem is with the piston ring or the camshaft.

If the air compressor will save me a lot of time in diagnostics, I'm willing to ponder purchasing one. Maybe I can rig some type of fitting so that a bicycle pump can fit onto the hose that came with my compression tester? I have a quick-release on my compression tester hose.

Regards, Craig

On Mon, 4 Oct 2004 14:03:17 -0400, Ken Lewis <kdlewis_wasting_time@access4less.net> wrote: > Crair, > I had an exhaust valve go slightly out of round cause this. I guess it > was the beginning of a "burnt" valve. > While adding compressed air to a cylinder listen at the throttle body, > tail pipe and oil filler to try and determine if the leak is an intake or > exhaust valve or rings. > > Ken Lewis > 86 Transporter Crew Cab > 60 356 T-5 Porsche > http://neksiwel.20m.com/ > Vanagon tech, pixs, O2 monitor gadget > >


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