[T3] On a 73 T-3 SB fuel injected aut trans pinging .

[William J]

If I could call someone with this cell phone and have them listen to the 
change with the sensor in and out of the system it would be impossible to 
miss.
----- Original Message ----- 
From: "William J" <catnine09 at dslextreme.com>
To: <type3 at vwtype3.org>
Sent: Saturday, December 09, 2017 11:28 AM
Subject: Re: [T3] On a 73 T-3 SB fuel injected aut trans pinging .


> 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 
>>> at
>>> all.
>>> 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 
>> mi/hr,
>> 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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>
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