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Date:         Sun, 27 Jun 1999 11:41:59 -0400
Reply-To:     John <u1031271@WARWICK.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         John <u1031271@WARWICK.NET>
Subject:      Re: Rough Runing on Start-up
Comments: To: Scarlett Semko <damosem@MAIL.MCO.BELLSOUTH.NET>
Content-Type: text/plain; charset=us-ascii

Scarlett Semko wrote: > > MMMmmmm, > > A new problem/opportunity/challange/pain in the @#% to deal with. > > Upon start-up my 1.9 runs rough. Rough idle, push on the gas and it will > probably stall, or long hesitation before the idle increases. Once it > warms up, around 3 to 5 minutes it smooths out and operates normally > (whatever that means). > > Any ideas Oh Mighty List? > > Thanks in advance > Ron Semko > Orlando, Florida (the mouse trap for people) > 1984 Vanagon with 200,000 plus miles (I don't know how many + cause my > odometer dosen't work anymore)

Scarlett,

Sounds like there is no warm up enrichment. There is a temperature sensor in the engine that reports engine temp to the Digijet control module (DCM) by varying a 5 volt signal. When cold the DCM richens the air-fuel mixture and gradually leans it out over a 3-5 minute period. The sensor should have high resistance when cold (~2-3,000 ohms) and low when hot (~400 ohms). JP


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