Date: Sat, 19 Feb 2011 17:37:59 -0800
Reply-To: Scott Daniel - Turbovans <scottdaniel@TURBOVANS.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Scott Daniel - Turbovans <scottdaniel@TURBOVANS.COM>
Subject: Re: On the road and need some help
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If it's running strongly on 3 cylinders, and running right ..
one weak or dead one makes a regular sound..
like a four running on 3 cylinders.
if it is clearly one weak or dead cylinder ..that's easy ..to diagnose at
least.
it has to be compression, ignition, injector/fuel pressure, or intake air
leak.
and you find a weak cylinder in 6 seconds shooting the header pipes by each
cylinder with an IR Temp Gun. - an indispensable small light toot that it's
silly not to have.
more likely ..my guess..
it that it's not running right ...too rich ....just weak on getting enough
fuel in ...
do the IR Temp gun thing and you may know more quickly.
be real nice in a way if it's one weak cyl...cause that is simple to
diagnose compared to 'won't run right' usually.
Think about Temp Sensor II ..
check everywhere for air leaks,
consider fuel delivery and pressure and fuel filter, and fuel pick up from
the tank.
Consider clogged or restricted cat or muffler.
I should right that diagnostic manual by golly.
'It's just a blockage or leakage of fluids or electrons."
Scott
www.turbovans.com
----- Original Message -----
From: "John Goubeaux" <john@UCSB.EDU>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Saturday, February 19, 2011 4:46 PM
Subject: Re: On the road and need some help
> Thanks, No problem is consistent, definitely not "vanagon syndrome" I'm
> thinking it may be a fouled injector or maybe one cylinder has very low
> compression or it's a bad plug wire ?
>
> -john
>
> On 2/19/2011 4:36 PM, Robert Stevens wrote:
>>
>> On Feb 19, 2011, at 5:12 PM, John Goubeaux wrote:
>>
>>> I'm on the road and several hundred miles from home ( southern CA) and
>>> my 90 Vanagon has begun to run bad. It is missing and has a serious
>>> reduction of power when under load. It starts up and idles, but is
>>> running real rough, no backfiring though. Its almost as if there is a
>>> fouled plug or bad ignition on one of the cylinders
>>
>> Wondering if this is what you have going on:
>> ""Condition: After driving for an extended period of time at a
>> constant speed, the vehicle may, on occasion, experience a
>> deterioration of performance which may be accompanied by hesitation or
>> surging. In many cases, after turning off the engine and subsequent
>> re-start without having taken any action, the symptoms disappear.
>> These symptoms may not recur for several weeks or months."
>>
>> "Service: To resolve this condition, wire harness Part No. 025 906
>> 302, should be installed. This harness provides improved signal
>> voltage stability."
>>
>> Remove electrical connector from air flow sensor. Install wire
>> harness, Part No. 025 906 302, between main harness connector and air
>> flow sensor connector.
>>
>> Part numbers are for reference only. Always check with dealer for
>> latest parts information. As of 6/1/98, it was still a good number
>> with list price of $138. VW calls it a "transformer" and the technical
>> bulletin does indicate there are "active components" in the harness,
>> so the old manual's trouble shooting resistance of the circuit are no
>> longer valid. They are given in the bulletin.
>>
>> To test the new harness, continuity between ends readings should be:
>> #1, 0 ohms; #2 greater than 1 megaohms; #3, 4 & 5, 0 ohms."
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