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

[William J]

 The Bently state to set the timing to have the lines off and plugged and 
only states the engine RPM at 850 idle . Is this correct? And if so when you 
raise it back to 950 plus or - 50 RPM this may advance the timing a bit. for 
an auto matic car.  What is the best way?
----- Original Message ----- 
From: "William J" <catnine09 at dslextreme.com>
To: <type3 at vwtype3.org>
Sent: Tuesday, December 05, 2017 4:55 PM
Subject: Re: [T3] On a 73 T-3 SB fuel injected aut trans pinging .


>
> ----- Original Message ----- 
> From: "Jim Adney" <jadney at vwtype3.org>
> To: <type3 at vwtype3.org>
> Sent: Tuesday, December 05, 2017 3:02 PM
> Subject: Re: [T3] On a 73 T-3 SB fuel injected aut trans pinging .
>
>
>> On 5 Dec 2017 at 13:15, William J wrote:
>>
>>> When you close the throttle the timing should return to 5 BTDC right 
>>> away
>>> shouldn't it?
>>
>> In cases like this, it doesn't always. That's because the advance 
>> increases
>> the RPM, which holds the advance up, and the advance being in play keeps
>> the idle up. So you've got a vicious circle.
>>
>> Try lowering the idle speed a bit.
>
> I tried that and got the same result , the advance still held far to high 
> and didn't return . Even when I had the idle at it's 950 auto trans set 
> point the idle would drop right back to 950 yet the timing just stayed 
> advanced  way past the 7.5 BTDC mark by about an inch .
>
> I just hope this solves the problem . I can't duplicate engine running and 
> what the weights were doing on the AF Dist. I could see the rust on both 
> weight pivot pins and the one with the heavy spring when moved didn't want 
> to return smooth. Even the edges of the weights where they ride the cam on 
> the upper shaft had rust and the only lube was on the upper cam wick and 
> the trigger cam . Both springs if I recall the light one acts before the 
> heavy one yet both = total mechanical advance.
>
> I'll post photo's and either send them direct to you or post on samba .
>>
>> -- 
>> *******************************
>> Jim Adney, jadney at vwtype3.org
>> Madison, Wisconsin, USA
>> *******************************
>>
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