[T3] On the subject of fuel senders and fuel gauge. Plus afewother questions.

[William Jahn]

Mike are you talking about a new IAD temp sensor?

Sent from Mail for Windows 10

From: Mike Fisher
Sent: Saturday, March 30, 2019 6:17 PM
To: T3 List
Subject: Re: [T3] On the subject of fuel senders and fuel gauge. Plus afewother questions.

My '69 FI/AT starts better cold & runs better with a new temperature
sensor!

On Sat, Mar 30, 2019 at 6:13 PM William Jahn <willjahn975 at gmail.com> wrote:

> I tried plugging in the IAD sensor then unplugged the TPS . It’s difficult
> to describe the result. With the TPS unplugged it didn’t idle very well and
> I get the same miss with the IAD plugged in as before with the TPS
> connected or not, it’s just over all worse and more difficult to tell with
> the TPS unplugged. It just runs better with the IAD sensor unplugged . It
> just does run very good at all with the TPS unplugged / I just did this for
> idle . I think it needs the TPS park position to idle proper . If I tried
> to open the throttle TPS unplugged it just struggles then quits so I can’t
> tell if it has the unstable RPM as I do with the IAD sensor unplugged . The
> issue with mine happens when it’s warm to full temp , I can’t feel it
> driving under a load with the sensor plugged in yet with no  load the idle
> is not stable. Although with the IAD sensor plugged in and in drive the
> idle is not stable the engine RPM’s keep changing at every stop it’s
> different and I checked and the electric AAR is closed . It’s close to be
> called hunting just not as drastic. With everything plugged in the RPM
> drops 200 PRM  and if I raise it adjusting the IAD bypass then it becomes
> unstable and can idle @ 800 RPM to 1,200 RPM. It seems there is a vacuum
> leak somewhere like the extra % of fuel the unplugged IAD temp sensor
> compensates for. Even when it’s warmed up with that sensor plugged it I can
> feel and hear this miss at the tail pipe , it’s not a steady miss like one
> cylinder would be it’s random as in it will miss once then I hear 3 misses
> . Without  actually  hearing it it’s difficult to put in words. It does not
> seem to be lack of ignition spark and if it is it might be the pertronix
> yet to me it is more like a lack of fuel . It’s a mystery why unplugging
> that sensor clears it all up in an instant. That sensors two wires do not
> have a short and the sensor reads what it should , it drops as it heats up
> and the readings are the same as they always were. Perhaps the sensor
> inside the IAD is covered in oil and is not getting the proper reading of
> the incoming air flow, all it needs is heat and it can get that just from
> the IAD’s temp , that’s just a guess. If I recall on older systems that
> sensor used oil temp , I thought I read that somewhere.
>
> William
>
> Sent from Mail for Windows 10
>
> From: Jim Adney
> Sent: Thursday, March 28, 2019 3:01 PM
> To: type3 at vwtype3.org
> Subject: Re: [T3] On the subject of fuel senders and fuel gauge. Plus a
> fewother questions.
>
> On 28 Mar 2019 at 14:14, William Jahn wrote:
>
> > Ever since then my gauge does not read consistent . If I make a turn it
> > drops then comes back . I haven´t pulled the sender out yet since the
> > sender has that cover isnTMt itTMs function to not allow fuel slosh to
> > affect the float?
>
> Yes, that's the function of the cover. Pull out your sender and check to
> make
> sure the cover is still attached.
>
> >  I´m still trying to figure out why the engine when warm has that
> > erratic miss and while giving it gas the RPM´s are not steady from
> > 1,200 RPM to 2,100 RPM with the IAD temp sensor plugged in.
>
> Please try the test of unplugging the TVS and see if that cures the
> staggering idle
>
> --
> *******************************
> Jim Adney, jadney at vwtype3.org
> Madison, Wisconsin, USA
> *******************************
>
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-- 
Eugene, Oregon

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