Date:         Thu, 22 Feb 2001 17:09:32 EST
Reply-To:     CMathis227@AOL.COM
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Chuck Mathis <CMathis227@AOL.COM>
Subject:      Re: Cold Start Chug and Warm Stumbling
Content-Type: text/plain; charset=ISO-8859-1

Before you yank your Temp II check the adjustment on your throttle position switches (an '84 probably has two -- one for idle and one for full throttle)the idle switch may be out of whack.  Also check the function of the Idle Stabilizer Unit.  Replacing the leaky exhaust and O2 Sensor will probably fix the warm stalling problem but check the condition of the plug wires if they've been around for a while -- bad ones can cause stalling under partial load.  The injectors could still be okay but the seals may be shot.

The Temp II gets blamed for a lot of problems and usually is responsible for a bunch.  Extra air getting in ahead of the O2 Sensor will cause your engine to run rich but since the O2 Sensor doesn't kick in until it gets warmed up it is not likely causing the cold idle problem -- that could be a problem with either the Temp II or the ISU maybe the Warm Air Valve (squeeze the fat braided hose going into the intake boot with a pair of plyers when the engine is idling cold, if the speed drops the Valve may be bad -- when the engine is warm it shouldn't change).

Lord, these things are fun!!!

Chuck
'85 Wolfsburg Westy -- 'Roland'

In a message dated Thu, 22 Feb 2001 12:31:37 PM Eastern Standard Time, Jason Yasment <vanagon@NYCAP.RR.COM> writes:

<< Patient: '84 1.9l Digijet currently in hibernation

Symptoms:  When first started the van will chug at low rpms until it warms
up.  If you get the rpms up and hold them there is does not miss.  When it
is warm to the point of the fan kicking on, and in stop and go traffic, it
appears to be flooding itself because when I go to step on the gas it wants
to stall.

What I think it is:  I'm leaning towards the Temp2 sensor, and/or some leaky
injectors.  These injectors have 143k miles on them.  I also have some
pinhole leaks in the front exhaust manifod just before the flange and the
collector.

Items to replace:  Temp 2 sensor, Injectors, Front Manifold, and O2 sensor
(it's overdue anyway).

Could it be anything else?  I could not find any vacuum leaks on the motor.
The motor itself is a Fast German Auto rebuild with 25k or so miles on it.

TIA,

Jason M Yasment
'84 Westfalia
'98 Jetta TDI
http://www.geocities.com/jasonmyasment/
http://www.geocities.com/jyasment/vanagon.htm
 >>