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Date:         Mon, 17 Apr 2006 08:51:05 -0400
Reply-To:     -------------------- <VW4X4@VERIZON.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         -------------------- <VW4X4@VERIZON.NET>
Subject:      Re: 2.1 Engine idles at 2600 rpm; 2nd computer doesn't fix
Comments: To: Ken Wilford <kenwilfy@COMCAST.NET>
In-Reply-To:  <444383AB.8010409@comcast.net>
Content-type: text/plain; charset=ISO-8859-1; format=flowed

What's really disappointing is seeing how VW realized this overheating problem in the ECU, and went back to the original design, (with the ignition module removed) in the 88-92 digifant golf/Jetta.

Joe W.

Ken Wilford wrote:

> I had a customers van here not too long ago with idling issues. Of > course you need to check your grounds and the throttle position switch > first to see if these could be bad or out of adjustment. If they are > fine then I usually swap over the idle computer from a good running > van. If that doesn't work I swap over the valve on top of the engine. > Still bad? I was scratching my head on this one, then I just tried > swapping over the engine ECU. Idle went back to normal. Apparently > something in the Engine Control Unit itself (under the back seat) was > causing the idle problem. Just an idea. I have all of these parts to > swap around so it makes it easier for me to test for these problems. > You could try swapping in an ECU from a good running van from 86-91 > (they will all work) and see what happens. I have rebuilt units with a > one year warranty for $250 if you find you need one. > > Just FYI: The factory 2.1l ECUs had problems with three things. They > decided to integrate the ignition module into the ECU so it got hotter > than the older ones with the separate ICM. Then they stuck it under the > rear seat where it gets no air flow. Then who ever was building the > boards decided to do a crappy solder job on several of the connections > (cold solder joints). Murphy's law was in full effect that day! > > Hope this helps, > Ken Wilford > John 3:16 > www.vanagain.com > > Tabe Johnson wrote: > >> To recap: Both my engine and that of Larry Himli (both 2.1s) >> idle around 2400-3000 rpm. In my case, it used to be that it >> would just do that till it got warm, then it would idle properly, >> and sometimes pop up to idle at 2400-3000 rpm. Now it does >> it all the time. I swapped out the idle computer. No change. >> My temporary fix: Unplug the idle air bypass solenoid. Engine >> runs great otherwise. >> >> >> Larry's AC thing is interesting -- it says that the idle computer >> is at least trying... I'm still wondering about the >> computer. There was a post a few years back about fixing damaged >> computers by replacing a one transistor that always blew. >> >> The inputs and outputs are pretty simple. I went through this >> too, and heres what I came up with: >> >> IDLE COMPUTER INPUTS: >> Idle Switch >> PS Switch >> AC Switch >> Hall Generator >> Temp sensor 2 >> Power from relay >> >> IDLE COMPUTER OUTPUTS: >> Idle air bypass >> >> Ideas? Anyone? Beuller? >> >> >> >> tabe johnson / 87 westy >> >> --- Larry Himli <lhimli@msn.com> wrote: >> >> >> >>> Bummer, I was so sure the relay would fix it....but no luck. It >>> still revs >>> up to about 2K and at least it oscillates back and forth. I turned >>> on the >>> air conditioning and it really revved up. So now we have to try >>> something >>> else. Have you studied the wiring diagram? I will try to look it >>> over and >>> see what might feed the relay, etc. At least it isn't raining >>> >>> >> >> >> > >


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