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Date:         Tue, 16 May 2006 09:31:05 -0700
Reply-To:     Michael Diehr <md03@XOCHI.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Michael Diehr <md03@XOCHI.COM>
Subject:      Re: FrontFire?
Comments: cc: -------------------- <vw4x4@verizon.net>
In-Reply-To:  <446799B7.3080206@verizon.net>
Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed

Thanks for the responses.

How could a too-lean adjustment cause the problem?

This is an intriguing possibility, cause i did have a mechanic (different than the shop that installed the engine) adjust the mixture after it was obviously too rich (smelled gassy & poor mileage).

On May 14, 2006, at 1:57 PM, -------------------- wrote:

> Your problem is cause by one of three things: > 1 lean a fuel adjustmnet, witch is unlikely > 2 timming to far advanced > 3 or as you say a intake valve out of adj. witch will > also cause a bad idle. > > > Michael Diehr wrote: > >> 85 with a newly rebuilt engine. Seems to run fine at speed, but at >> idle is behaving very weirdly. Been fiddling with the idle adjuster >> screw, and can't seem to find a setting that lets it idle when cold, >> w/o surging upon deceleration at 1500 rpm when warm. Pretty sure the >> throttle closed switch is correctly adjusted, timing is good, etc. >> >> The latest thing that has me worried is a bizare "clunk/zap" sound >> coming from the airbox. It happens intermittently when the idle is >> dropping below 900. Dissappears completely if you goose the throttle >> to get it above 900rpm. As near as I can tell, the sound is caused >> by a "pop" that is reverberating through the throttle body, AFM, and >> airbox. If you put your hand on it you can feel it happening. >> This is a brand new rebuild engine, and this is a sound that I've >> never heard on a vanagon before. >> >> Could this be caused by a broken/stuck/misadjusted intake valve? (so >> that when the cylinder fires, pressure is going back up the intake >> manifold?) If so, why would it only happen when the engine is >> lugging at idle (say, 750 rpm or so?) >> >


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