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Date:         Mon, 12 May 2003 18:12:38 -0700
Reply-To:     zampano <matthias.k@ATTBI.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         zampano <matthias.k@ATTBI.COM>
Subject:      Vgon syndrome on a 1.9WBX
Content-Type: text/plain; charset=US-ASCII; format=flowed

Here's what's going on (aside from the coolant issue in my other post):

She's been getting 15 mpg in mixed driving over the last month. I checked around her and saw that the J-pipe in the exhaust, the one that houses the OX sensor, had a hairline crack. So I disconnected the OX sensor. Now, 11/2 weeks ago the J-pipe got replaced. I reconnected the OxS and went to have her smogged. Passed (in California). But I kept on getting poor fuel mileage, about 15 mpg. No other problems except coolant whizzing out of the water pump. Ran beautifully and powerful. So I went and exchanged the OxSensor, checked visually for all the vacuum hoses and tightness, all connectors, all ignition wires etc. Went for a ride with the new OxS yesterday and she ran worse, poor idling, would not go past 4000 rpm once warm, in any gear, accompanied with some occasional bucking. I now just replaced the rotor and cap, but that only worked until she was fully warmed up again. Needless to say I don't have the OxS connected anymore at all. This is a rebuilt/resealed motor with about 3000 miles on it.

My plan is to

- check and replace spark plugs, do compression test - check coil - check ignition wire resistance - try to perform a test on the AFM (per Bentley) - try to test distributor - call Autotrader :(

I am pretty sure it is a ignition problem vs. fuel problem Not 100% though. The fuel filter is about 18 months old, the air filter is 6 months old. The fuel pump and fuel regulator are 3 years old. How would I be able to check the injectors, apart from taking them out and see that the spray is cone shaped??? Could my exhaust be blocked from a disintegrating cat?? She runs perfect when cold, say for about 2-3 miles in city traffic, and she'll happily rev past 4000 rpms. Once warmed up this is no more so.

I am gonna go and piss off into the archives for couple hours, meantime, any and all help is greatly appreciated.

Matthias

'84 WBX Man Wolfy in Los Angeles, CA


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