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Date:         Wed, 16 Jun 2004 16:37:39 -0700
Reply-To:     "Mike D." <md03@XOCHI.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         "Mike D." <md03@XOCHI.COM>
Subject:      Cold idle mystery
In-Reply-To:  <20040616190502.723F25B955@gollum.dreamhost.com>
Content-Type: text/plain; charset="us-ascii" ; format="flowed"

Ok, time to put on your thinking caps. Can anyone solve this by sheer brain power alone?

Details: 1985 1.9l Westy w/Auto Trans and Air Conditioning 145k miles Compression fair (around 120-125 each cylinder) Recently replaced Digital Idle Stabilizer Recently replaced AFM Timing @ 5BTDC

Symptoms:

When warm runs fine. Get 17-18mpg on the highway @ 65mph, so I don't think there is any gross mechanical problem with the engine or mis-tuning.

When cold (60F), it starts right up, but quickly (either immediately, or within a minute or two) the idle is rough and the engine will die when in Drive, and sometimes even when in Neutral. I have to keep one foot lightly on the accelerator to keep it from stalling. Within about 10 minutes of driving, the problem goes away.

I've tried setting the idle higher when cold (with a few turns of the idle adjustment screw). This solves the stalling problem when cold, but then when the van is warm, the idle is way too high (1500+ rpm).

I've gone through the Bently and done most of the electrical digijet diagnostics (resistances of temp senders when cold and hot, etc.) without finding anything amiss.

Ideas?


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