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Date:         Fri, 14 Dec 2007 08:02:17 -0800
Reply-To:     Michael Diehr <md03@XOCHI.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Michael Diehr <md03@XOCHI.COM>
Subject:      Knock Knock ?
Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes

Stump the chumps: I've got an 85 auto with a rebuilt engine with about 5000 miles on it. It's running ok overall (mpg around 17-18 in fast california driving), but power seems a bit off (even for vanagon standards).

The problem: The engine makes a ticktick sound at around 3000 rpm that was definitely not there in the prior engine.

It sounds a bit like ping, but the behavior is not always ping-like: * only happens under 1/2 to full throttle under load (consistent with ping) * it's worse at altitude and cold (backwards? ping is usually worse at sea level on hot days, right?) * not obviously connected to the octane of fuel. (inconsistent with ping) * the frequency of the tick noise sounds like it may be happening on 1 cylinder only (e.g. unlike ping, it doesn't seem to decrease in frequency when you add more throttle, just the loudness increases. When i've driven cars with ping, usually the ping frequency is dependent on throttle/load too)

It has rebuilt injectors that were flow tested at witchhunter. The valves have never been adjusted, and I *think* the shop that installed the engine (to which i'm unable/unwilling to go back to them...a long story) may have replaced the distributor and messed with the mixture adjustment screw, as well as putting in a new (rebuilt) ECU. I'm running mobil 1 15/50 w/mahle filter.

Ideas? I'm having a real mechanic look at it, and would like to make sensible suggestions...


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