Date: Mon, 17 Apr 2006 16:33:44 -0500
Reply-To: John Rodgers <inua@CHARTER.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: John Rodgers <inua@CHARTER.NET>
Subject: Re: 2.1 Engine idles at 2600 rpm; 2nd computer doesn't fix
In-Reply-To: <20060417202113.43626.qmail@web38905.mail.mud.yahoo.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
I'm with Ken. sounds like a vacuum leak.
Check the hose from the Crankcase vent on top of the engine over to the
AFM. These will rot out on the bottom and go un-noticed. Caused me all
kinds of idle grief until I found it.
John Rodgers
88 G:L Driver
Tabe Johnson wrote:
> Ken,
>
> Thanks for the idea. Tried a new ECU; no change. Still idles high.
>
>
> tabe
>
>
> --- Ken Wilford <kenwilfy@comcast.net> 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
>>>>
>>>>
>>>>
>>>
>>>
>
>
|