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Date:         Fri, 9 May 2003 08:48:12 -0700
Reply-To:     gary hradek <hradek@YAHOO.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         gary hradek <hradek@YAHOO.COM>
Subject:      just passed CA smog, but poor mileage
Content-Type: text/plain; charset=us-ascii

It is hard to explain a loss of fuel economy as a crack should decrease fuel econmy and increase power but the poor smog reading can easily be explained by the crack. The crack will cause higher than normal o2 levels inside the exhaust generating increased voltage from the 02 sensor telling the ecu to send more chessburger please. This rich mixture may have done damage to the cat converter. If your planning on satying in california I would save for a cat converter. Which brings up a question I have. Has anyone in california bought one of those economy priced cat converters from busdepot? Do they work well enough to keep your hydrocarbon levels low? Getting back to the first question about poor fuel economy. I would measure the voltage of the 02 sensor and perhaps replace the temp2 sensor. regards gary-----Original Message----- From: Vanagon Mailing List [mailto:vanagon@GERRY.VANAGON.COM] On Behalf Of zampano Sent: Thursday, May 08, 2003 10:38 PM To: vanagon@GERRY.VANAGON.COM Subject: just passed CA smog, but poor mileage

Hi all,

I just got my 84 Wolfy Manual WBX smogged 4 days ago, CA smog. It passed. But I am getting worse fuel mileage than I used to. To the tune of 15/16 mpg instead of 18-20mpg. It was in the shop because the water pump was leaking, and the driver side exhaust pipe, right after the header, the one the OX sensor screws into, was replaced, because it had a crack. Went to smog it afterwards and the results were: HC: 127@15mph (129 allowed, 46 average), 87@25 mph (101allowed, 32 average). The CO were 0.27@15mph (0.84 max allowed, 0.16 ave), 0.19@25mph (1.06max allowed, 0.15 average) the NO were 822@15mph (1076 max allowed, 406 ave) and 299 @ 25mph (1103 max allowed, 349 ave). Seems like I barely passed on he HC, which means I have a rich mixture, right?? Where should I start looking?? Could my fuel tank/lines be leaking?? I'm guessing it's the OX sensor. Any and all input greatly appreciated.

Happy Trails

matthias

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