[T3] 73 squareback auto trans FI question

William Jahn willjahn975 at gmail.com
Fri May 20 15:06:10 PDT 2022


 I checked the timing. first I checked the point gap and it was still .016"
and the timing was still where I set it. I had it warmed up and decided to
check for vacuum leaks. I didn't see any plus I replaced all the vacuum
lines 2 years ago. Then I thought I'd check the MPS adjustment . Before I
replaced all the intake  gaskets I bought from you and runner hoses it had
this erratic idle like hunting and unplugging the IAD temp sensor stopped
the hunting . By the way replacing all the vacuum lines and fuel hose and
injector seals ,head gaskets and runner hoses. After all that work it still
ran exactly the same , no change at all. I asked on Samba and tram
suggested adjusting the MPS so I did.
Tram told me how to get the epoxy off that keeps the hex adjusting screw
from turning . I then adjusted the MPS 1/4 turn CCW . At that point the
idle was the same as with the IAD temp sensor unplugged . What I did was
adjust the MPS while checking it against the temp sensor to find the point
where it ran the same with the temp sensor unplugged and plugged in . I had
the MPS adjusted 1/4 turn CCW so I turned it a bit more than another 1/8
turn CCW and now it runs like it did.  No more low idle and hunt.

 It could be the gas we have here now , on the pump at Arco they state at
least 10% ethanol yet who knows if it's more. All this happened  right
after they raised the gas prices.


On Wed, May 18, 2022 at 5:12 PM William Jahn <willjahn975 at gmail.com> wrote:

> Jim :
>  That's true , the only problem is the inductor is metal so even during
> the time it takes to just check the timing it gets hot. I did get a harbor
> freight timing light that has a plastic inductor and an advance dial to set
> the timing on TDC. I never tried it but it might work better.
> William
> On Wed, May 18, 2022 at 4:57 AM Jim Adney <jadney at vwtype3.org> wrote:
>> On 17 May 2022 at 14:38, William Jahn wrote:
>> > Last time I checked the timing using an Actron timing light I was told
>> to
>> > check the timing engine hot . The trouble with that is the induction
>> clip is
>> > metal and gets so hot it affects the reading at least that's what
>> Actron told
>> > me.
>> There's no need to leave the timing light attached the whole time the
>> engine
>> is warming up. Just attach it after the warmup and then check the timing.
>> --
>> *******************************
>> Jim Adney, jadney at vwtype3.org
>> Madison, Wisconsin, USA
>> *******************************
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