Date: Sun, 10 Mar 2013 18:06:08 -0700
Reply-To: Scott Daniel - Turbovans <scottdaniel@TURBOVANS.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Scott Daniel - Turbovans <scottdaniel@TURBOVANS.COM>
Subject: Re: Throttle stop switch? Stumbles on resume throttle..
In-Reply-To: <CAHTkEuLKmVSywVLWwH5scQ5cO64Tac0C=L8tF24g_uQ+5nOE9g@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Sounds like an AFM..
the common failure modes I see in them are dead spots ..
and subtle 'uneven running.'
fwiw ..there are many cars that have their 02 sensor in only one back of
the cyinders..
like one bank of a V-6 or a V-8 ..
so having the sensor in just one pipe might work ok.
that's a lto of miles. How does the output read with a digital ohm meter ?
if you have identical front and rear tires ..
especially if they are 14 inch ones and D load rating , I'd probably
think the handling is pretty bad , like 'choppy' and understeering,
compared to what they can be , in my experience.
they don't have to change directions on bumps as vanagons do with D load
rating front tires,
thus requiring constant small steering correction ..
and they don't have to be under-steering pigs either, which many of them
are.
and with really a lot of weight ..sure ...they don't handle that well then.
and ,
I just did 360 miles or so round trip to Bend ..taking most of my
vanagon tools..
a 4 speed vanagon transmission, a whole syncro vanagon transmission,
and a vanagon automtic trans.
that's about 450 lbs or so in transmissions only. I can't say my
adventurewagon with its tire set up really noticed the addtional
weighthandling wise, or power on hills wise either.
On 3/10/2013 5:37 PM, Don Hanson wrote:
> I don't know about the MAF vs MAP sensor...whatever the vanagon uses,
> that is what I think I have....they just stuck some pipe onto the end of
> the Vanagon air filter assembly to run the intake around to the throttle
> body of the inline motor....There is a rectangular box between the filter
> and the rest of the 'plumbing' that has a long flat many wire plug....
>
> I do have a 3 wire O2 sensor. That may be a contributing factor as it
> is now about 60k miles old and runs on only one of the two downpipes I have
> into my cat-less custom exhaust......"cooling down too much" on the O2
> sensor, that could also be part of the issue, I suppose....It does seem
> slightly more likely to hesitate when it is really cold outside, or when I
> am up in the high mountains...
>
> I'll be working on all these 'possibles' soon. I have a spare new O2
> sensor that should go in anyhow and some adjusting of the throttle switch
> is probably also due...as you say, it is a wear-item, being mechanical....
>
> On a different note, the van behaves like a "Sports Car" without all
> that weight I was toting around all winter....
>
> Don Hanson
>
> On Sun, Mar 10, 2013 at 3:27 PM, Scott Daniel - Turbovans <
> scottdaniel@turbovans.com> wrote:
>
>> What I aim for on throttle switch at idle is ..
>> as close as you can get it to breaking contact 'just barely' off of full
>> idle ..
>> and as long as it always makes contact at idle every time.
>>
>> need to have a little bit of throttle cable freeplay too of course.
>>
>> Do you have a 3 wire heated oxygen sensor ?
>> and is it working ?
>> if it's non-heated ( should be heated on your engine ) it may be cooling
>> off too much during deceleration for more than a little bit.
>> I forget if you have an Air Flow Meter or an Air Mass Meter .
>> which one please ?
>> scott
>>
| 
