[T3] On a 73 T-3 SB fuel injected aut trans pinging .
fisherfarms at gmail.com
Sat Dec 9 12:06:08 PST 2017
My '69 FI/AT 1600 never seems to vary more than about 50 rpm?
On Sat, Dec 9, 2017 at 11:28 AM, William J <catnine09 at dslextreme.com> wrote:
> I think it's possible and even probable .
> There is just one detail I wanted to add. I just want to stress one point.
> I don't recall if I brought this up about when I start the car cold well
> before the ping thing . The AAR would be open , the idle would be set at
> 950 , in a minute the idle would rise to 1500 RPM and once in reverse drop
> back down . As soon as I placed it back in park it would hang at 1500 for a
> while. And not to dwell on the unplugged air temp sensor . I just drove it
> today and last Thursday with the sensor un plugged and it no longer does
> this. From what I understand The AAR is only to allow air to bypass the
> closed throttle plate and the MPS senses this adding more fuel . It's not
> supposed to increase the RPM that much perhaps a bit yet not 550 RPM's
> higher than the set base idle . Since it rises so much it in fact advances
> the timing which it will because of the RPM increase . What it does now is
> start and run at 950 and basically holds that even in drive only with a
> short drop when I shift it into drive or reverse and once warm the idle
> drops to 850 and seems to remain there in drive then in park rises to 950.
> About a year ago it would have the 1500 RPM right away and if I let it idle
> it would stay there for a good 15 to 20 minutes then drop to the 950 and
> begin the erratic miss.
> I only bring this up not to debate what percentage the air temp sensor
> richens the mix only because doing this changes the way it runs so much . I
> have read this was an old techs trick on Rennlist I think . On the other
> end and only by a few people on Samba I am told to adjust the MPS . My
> thinking is not to mess with the MPS I feel it just work as is . It does
> not leak and the 2 readings 90 ohm and 350 ohms are when they should be
> and it's the proper one for my E system..
> I do agree with a long drive yet based just on what the sensor does and
> it's not just the idle that smooths out it runs better as I drive it. Once
> I pulled the Dist that was sticking and installed the AH and timed it it
> lost a bit of pickup that came back with the sensor unplugged. I imagine
> there is some difference between the two distibutors advanc curve. Yet this
> did not fix the erratic miss that remained the same.
> Do I look for a vacuum leak?
> I am just trying to find out why this is. I'd rather run rich than lean
> for obvious reasons.
> ----- Original Message ----- From: "Jim Adney" <jadney at vwtype3.org>
> To: <type3 at vwtype3.org>
> Sent: Saturday, December 09, 2017 5:10 AM
> Subject: Re: [T3] On a 73 T-3 SB fuel injected aut trans pinging .
> On 9 Dec 2017 at 11:18, Dave Hall wrote:
>> I wonder if all this is the car's way of asking you to take it for a good
>>> drive. Unless I'm mixing up two listees, this car isn't driven very far
>>> I've certainly heard of VW dealers resorting to a good brisk drive in a
>>> 'grumbling' car that does minimal mileage, just to clear out the 'soot'.
>>> Now the advance is working better, maybe that's worth trying?
>> Yes, I'll second that. William has said he never gets the car above 45
>> so let's see what a couple hours at 65-70 does.
>> Jim Adney, jadney at vwtype3.org
>> Madison, Wisconsin, USA
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