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Date:         Fri, 9 Mar 2001 15:43:55 -0500
Reply-To:     Joe Romas <jromas@COLUMBUS.RR.COM>
Sender:       Vanagon Mailing List <>
From:         Joe Romas <jromas@COLUMBUS.RR.COM>
Subject:      Re: slight surge from 2000 to 3000 to 2000 and back
Comments: To: Matthew Pollard <poll7356@UIDAHO.EDU>
Content-Type: text/plain; charset="iso-8859-1"


I don't know if this could be your problem but after reading about it lately I replaced my o2 wire on my 84 1.9. It's been plagued with surging idle, poor fuel mileage and ran real rich not all but most of the time since I got it last August. With the old wire in hand I determined that yes it is a coaxial wire, it has a shield that keeps out rf noise, and at the sensor end the inner insulation was hardened and cracked and the inner conductor was shorting to the outer grounded shield. This was hard to see because both of the insulations were green and they blended together. That caused a constant 0 on the o2 signal and as I understand it that means lean and give it more fuel, and it did. It's cold here in Ohio so I didn't spend much time adjusting the misadjusted mixture but it ran oh so much better at all speeds and conditions. Smooth constant idle and more lowend pulling power.


----- Original Message ----- From: "Matthew Pollard" <poll7356@UIDAHO.EDU> To: <vanagon@GERRY.VANAGON.COM> Sent: Friday, March 09, 2001 2:55 PM Subject: slight surge from 2000 to 3000 to 2000 and back

> THis is driving me nuts. (84, 1.9) > I have a surgin' issue. It has been haunting me since the Clinton > Adminstration. Here is what is doing and what i've done. > Slight surge when driving. Idle is smooth at 1000 or so. while in neutral > if i accelerate to 2000rpm and hold it, after 30second or so it will go to > 3000rpm for 15 seconds or so and then back to 2000. Repeat every 30 to 40 > seconds. Grounds- all polished and some replaced for kicks. AFM, track > cleaned- 40K on it. Oxy sensor- new. Temp2- new. Thermostat- new, > throttle switchs turn off as soon as you move the accelerator cable and > when fully open. Air filter new. Ohhh, new seat swivel. All vacuum lines > replaced (all that i could find at least) fuel pressure regulator replaced > with a used 'good' one from a list person (traded for quart of my honey). > Plugs, cap, wires, relays ok. COmpression great. > > Not done but could they be the issue? > Crack case ventilation > Idle stabilizer (but the idle is stable) > 22uF capicator fix (details needed on that) > > I only 1/2 trust the bus because of this. I've searched the archives for > this and got mostly the things i've already done... > -THanks > Matthew > 84 w/ new swivel :-) > > Matthew Pollard > Dept. of Chemistry > University of Idaho >

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