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Date:         Sat, 20 Jan 2007 14:10:58 -0500
Reply-To:     Dennis Haynes <dhaynes@OPTONLINE.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Dennis Haynes <dhaynes@OPTONLINE.NET>
Subject:      Re: Ping/Knock/Detonation
Comments: To: Michael Diehr <md03@XOCHI.COM>
In-Reply-To:  <34205637-A0A0-4158-8BEA-961129220DAF@xochi.com>
Content-type: text/plain; charset=US-ASCII

Did you convert to the cooling system with the oil cooler to also cool the pistons? Detonation is extremely speed and load over time sensitive. The 1.9 FI system should not be a problem, both use the same injectors. Is the timing set to spec or slightly advanced? Get it set back down. Make sure the vacuum retard on the distributor is working to reduce the timing during part load to reduce the peak flame temperatures. Pinging actually occurs long before you hear it. While pinging, you working at busting rings, melting pistons, and burning valves or even cracking heads. This is where EGR could be helpful but the Vanagon does not have it.

Dennis

-----Original Message----- From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Michael Diehr Sent: Saturday, January 20, 2007 1:02 PM To: vanagon@GERRY.VANAGON.COM Subject: Ping/Knock/Detonation

I'm finishing up a long (3K miles) road trip and the van has been running like a champ (for the first time ever, wahoo!). However, I've noticed a problem with pinging (aka knock aka detonation). It's very particular -- it only happens at 1/2 throttle or higher at 3200 thru 3500 rpm, even on 91 or 92 octane gas. Happens most of the time -- only exception seems to be at temperatures of 30F and lower at 3000F altitude or higher, which seems very consistent with it being ping (heat & pressure related).

As far as I know, the timing of the engine is good at idle, but I doubt that the advance has ever been tested.

This is a 85 westy automatic with a newly rebuilt 2.1L block installed (about 5k miles post rebuild). It has the stock 1.9FI system, including a rebuilt computer & distributor & afm.

It seems weird to me that the RPM range is so specific -- it really only does it at that particular RPM range. Any ideas? Bad distributor advance? Flat spot in the AFM? 1.9L FI system not well matched to a 2.1L block?


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