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Date:         Mon, 12 Jan 2015 13:20:04 -0800
Reply-To:     Stuart MacMillan <stuartmacm@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Stuart MacMillan <stuartmacm@GMAIL.COM>
Subject:      Re: Hesitation off idle, throttle body issues?
Comments: To: Kevin Duvernay <kduvey@gmail.com>
In-Reply-To:  <CAHQe0n7GwQq5dTGzsfcEwxAWJrTqrPb0Ohp4YVYrEabnrnE2MA@mail.gmail.com>
Content-Type: text/plain; charset="UTF-8"

Once you see the bottom of the switch it will be obvious what’s wrong. It’s just a cam with two lobes 90 degrees apart, one for the off-idle and one for the full throttle.

I have no experience with GW’s switch, since mine was fine after I set it, and the PO had really messed up the adjustment. Since they warrant their stuff, I’d go for it if you need one. I’d also replace the TB sealing ring while you are at it. Mine was completely compressed and hard as a rock, making it a potential vacuum leak.

Stuart

From: Kevin Duvernay [mailto:kduvey@gmail.com] Sent: Monday, January 12, 2015 10:37 AM To: Stuart MacMillan Cc: vanagon@gerry.vanagon.com Subject: Re: Hesitation off idle, throttle body issues?

Thanks Stuart,

I would not describe the switch to be 'immediate' upon applying throttle, there is a small distance the cable retracts before it engages. The adjustment bottoms out and will not allow me to make it any closer. Also, the switch does not switch at full throttle, however the van seems to run great even at full throttle.

Sounds like I need to remove the TB and inspect/clean it. Any thoughts on Gowesty's vacuum operated TPS? Worth the money?

On Mon, Jan 12, 2015 at 12:29 PM, Stuart MacMillan <stuartmacm@gmail.com> wrote:

I just did this adjustment, and the first thing you need to do is remove the TB so you can really see what's going on. Use a voltmeter set on ohms to check, and the TPS should switch immediate upon moving the throttle, and switch again only at max throttle.

Go Westy has their own version of a new TPS for $50, and a rebuilt TB with switch for $250. http://www.gowesty.com/ec_search_results.php?search_phrase=throttle+position You only need a TB if the shaft is so worn that it wobbles sideways.

Stuart

-----Original Message----- From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Kevin Duvernay Sent: Monday, January 12, 2015 9:59 AM To: vanagon@GERRY.VANAGON.COM Subject: Hesitation off idle, throttle body issues?

Hey guys,

I recently messed with the tps adjustment to try to fix a 'bucking' with on/off throttle that I'm experiencing and it created a new issue. My 87 westy w/ 2.1 is now hesitant just off idle for a second or two. Depending on how the tps is adjusted, it can even actually stall. It's worse if I punch the throttle rather than ease into it. Once I get up off idle it runs fine.

Problem is, I cannot get it adjusted enough to be perfect. If fact, the adjustment seems to do very little to actually change the location where the switch switches on and off, which I believe is too far from the idle position (lever moves almost 1/4 inch before the switch clicks no matter how far I tighten the adjustment screw). If I tighten the adjustment screw all the way and tighten the set screw while still keeping the adjustment screw tight then I get it to run best, but not quite perfect. Very slight hesitation, but I know it's still there.

I fear there may be something worn in the throttle body preventing accurate adjustment of the switch. Also, the braided hose that the purple vacuum tube slips into seems a little damaged, may or may not be leaking slightly? I taped it up, didnt seem to change anything.

Either way, the van ran perfectly before I tried to adjust the switch, FYI.

Time for a rebuilt throttle body? Anything else I can try first? Is it possible to rebuild a throttle body myself?

Thanks


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