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Date:         Thu, 10 Oct 2013 18:31:35 -0700
Reply-To:     Scott Daniel <scottdaniel@TURBOVANS.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Scott Daniel <scottdaniel@TURBOVANS.COM>
Organization: Cosmic Reminders
Subject:      Re: Runaway Engine RPMs
Comments: To: Jim Felder <jim.felder@GMAIL.COM>
In-Reply-To:  <CAFnDXk3uMPergT58Mq3p5ABJvc2WdTxObik5UCBM51a8h_qUQg@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

when I was about 5 I figured out how to connect a D cell battery to the electromagnet in my Erector set. No one had told me it would use up the D cell's juice if I just left it connected. I left it connected to show to my father when he got home....battery was dead by then. I've been playing with DC electricity like that ever since. Working on aircraft avionics systems ( radar, IR, radio, navigation, missles, a big computer, weapons systems on one aircraft ) in the AF in the 70's helped too. I started playing with electrics on cars in 1964 and have been ever since more or less. I don't do anything fancy or complex even .. oh ...here's a fun one..I just remembered. I made me own clock-radio in the 60's by running two wires from an old fashioned tick-tock alarm clock .. using the bell striker inside the clock as contact points ....used that to trigger my transistor radio to come on ...nothing fancy at all...just interrupted the battery contacts in the radio. Electricity is tons of fun. Pretty magic too. Be glad we are playing with these pretty old fashioned non-computer-everything Vanagons,.

On 10/10/2013 6:08 PM, Jim Felder wrote: > 10-4 to that. > > Although after following this list for eleven or so years, I have > discovered more about 12 v electronics than in the previous 50+. And my dad > was an electrical engineer and a damn good one... not much rubbed off on me. > > Jim > > > On Thu, Oct 10, 2013 at 8:02 PM, Don Hanson <dhanson928@gmail.com> wrote: > >> I always check the mechanical stuff first...because I am not comfortable >> with Ohms, watts and that stuff...Eventually I can get through the >> electrical parts, but geeze! it seems like every time I pick up my >> multimeter or try to read it and follow a Bently or other factory >> electrical trouble shooting guide, about half of my readings are not even >> found in the same units I am looking for or the fuse is blown or a wire is >> loose...Tedious is what I find messing with resistors and relays. Give me >> a torque wrench or a die grinder and I am ok to go...give me 2-1-2 blinks >> of my Check engine diagnostics and I get frustrated pretty quickly... >> >> >> On Thu, Oct 10, 2013 at 5:56 PM, Don Hanson <dhanson928@gmail.com> wrote: >> >>> I think it sounds like something in the throttle body or the >>> linkage...Perhap the TB is getting worn and allowing the throttle plate >> (is >>> that what you call it?) to stick or get pulled open due to wear and or >>> loose something... might be worth looking at the condition of the >>> mechanical part of your intake... >>> >>> >>> On Thu, Oct 10, 2013 at 4:28 PM, Larry Alofs <lalofs@gmail.com> wrote: >>> >>>> John, >>>> If you have access to an ECU to swap in, it might be worth a try. I >> was >>>> struggling with a '91 about a year ago. It had various running/idling >>>> problems that I gradually solved; during which I put in an ECU that I >> had >>>> once tested and found to be OK. Suddenly the van refused to idle down >>>> properly and nothing I did could fix it until I put the original ECU >> back >>>> in. The idle was not 3K, more like 2300, but way too high. I repeated >>>> the >>>> swap to be sure and retired that ECU. I looked at the circuit board, >> but >>>> could not see anything suspicious. >>>> >>>> Larry A. >>>> >>>> >>>> >>>> On Thu, Oct 10, 2013 at 4:54 PM, John Meeks <vanagon@gmail.com> wrote: >>>> >>>>> Thanks Scott - >>>>> >>>>> I'll try unplugging the ISV next time it does this. I think that's a >>>> good >>>>> troubleshooting first step. Not sure yet what it will tell me. I think >>>> that >>>>> valve just add more more less air to the mix. You can hear the little >>>> motor >>>>> running in there with the key on. >>>>> >>>>> It's probably worth inspecting the ECU solder joints with a strong >>>>> magnifying glass too. I'll be able to do that this weekend. >>>>> >>>>> John >>>>> >>>>> >>>>> >>>>> On Thu, Oct 10, 2013 at 3:28 PM, Scott Daniel < >>>> scottdaniel@turbovans.com >>>>>> wrote: >>>>>> I sure wouldn't call 3K rpm 'runnaway' ..though it does sound >> really >>>>>> dramtic to discribe it that way. >>>>>> if it was really runnaway .. >>>>>> it would be screaming at 6,000 rpm or so. >>>>>> >>>>>> I wouldn't think that the TPS telling the ecu that your at full >>>> throttle >>>>>> would do this. >>>>>> I believe all that does is bypass 02 input at WOT. >>>>>> >>>>>> And ..I have seen the electronic control unit and/or idle air valve >>>> cause >>>>>> this. >>>>>> I've had a vanagon sitting in a bay of my shop idling .. >>>>>> suddenly jump to very high rpm all by itself. >>>>>> >>>>>> Unplug the Idle Air Valve right there on top of the engine. >>>>>> ISV valve sometimes called too. Idle Stabilizer Valve. >>>>>> >>>>>> Scott >>>>>> >>>>>> >>>>>> >>>>>> On 10/10/2013 9:44 AM, John Meeks wrote: >>>>>> >>>>>> Yesterday I was in a 2 mile stop and go traffic jam. About 3/4 of >> the >>>> way >>>>>> the low speed fan came on as expected. A minute later the engine >>>> revved >>>>> up >>>>>> tp 3K rpm and stayed there. The gas pedal was all the way up. >> Couldn't >>>>> get >>>>>> off the road so I turned off the engine when there was a stop >>>> situation. >>>>>> Turning it back on the engine revved right up to 3K again. >>>>>> >>>>>> Finally pulled into a parking lot and waited about 15 minutes. >> Started >>>>>> normally with no recurrence the rest of the way home. >>>>>> >>>>>> I had this same problem about a year ago (intermittant) and 'fixed' >> it >>>>> with >>>>>> a new throttle cable and cleaning out the rust and dirt from the >>>> pedal to >>>>>> cable housing. Now it's back! >>>>>> >>>>>> Side note just put the engine in after head gaskets and ring >>>> replacment >>>>>> and It was running great for the past week. >>>>>> >>>>>> Could the TPS be the culprit if it made the ECU see full throttle >> and >>>> ECU >>>>>> then enriched the mixture? >>>>>> >>>>>> Any ideas are welcome. >>>>>> >>>>>> John Meeks >>>>>> '91 Vanagon MV Phoenix >>>>>> Stock 2.1 250K miles >>>>>> Northern Michigan >>>>>> >>>>>> Vanagon Rescue Squad < >>>>> http://www.vanagonauts.com/Vanagon-Rescue-Squad74.htm> < >>>>> http://www.vanagonauts.com/Vanagon-Rescue-Squad74.htm> >>>>>> Android and iOS apps >>>>>> www.vanagonauts.com >>>>>> >>>>>> >>>>>> >>>


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