Re: Problem with 75 TS

[Anders Nilsson <anders.nilsson@domain.elided>]

Thanks, but.....
I'll have to admit that I forgot to mention that I had already tested the idle
switch. Pretty stupid thing since it was the first potential culprit that
entered my mind too. :-(

What I maybe should do, is test the idel connector from the large Motronic
connector instead of directly under the butterfly. There is a slight possibility
that a short along the way could make the Motronic believe that the throttle is
closed although the switch works.

BTW,
About the connector behind the cardbord.
Been there, done that.
Nowadays nice and shiny :-)

/Anders

> Date: Fri, 26 Feb 1999 09:17:29 +1100
> From: David Masters <david@domain.elided>
> Subject: Re: Problem with 75 TS
> 
> Date: Wed, 24 Feb 1999 19:49:21 +0000
> From: jonathan coates <alfa@domain.elided>
> Subject: Re: Problem with 75 TS
> []  Anders and Jonathan discuss ....
> 
> []  Anders ...
> >My 75 TS won't run (sort of). When I started it, it idled smoothly, so I 
> backed
> >out of my car port. Then I found that idling was the only thing the car 
> wants to
> >do. If I open the throttle, it revs up to about 2000 rpm where it dies. 
> When the
> >revs have come down to about 1000 rpm, it fires up again.
> >
> >It makes no difference if it is warm or not.
> >I hooked up the timing lamp, and found out that there was no spark at all 
> when
> >the engine dies, seems like the ECU turns it off when I reach 2000 rpm 
> (pretty
> >lame rev limiter, duh).
> >
> >I've checked power supply, no problems.
> >AFM is working fine.
> >
> >Any ideas anyone?
> 
> []  Jonathan .....
> There is a throttle closed switch which kills the spark and injectors
> above 2000rpm if the throttle is closed, it's supposed to reduce fuel
> usage when you lift your foot. It's located under the throttle body and
> is a bit adjustable by undoing two screws and twisting it. It's a bitch
> to get at.
> []  David
> Agreed.  Pull all the air cleaner off, and the AFM, and then undo the 
> butterfly from the intake manifold.  You can prise the back off the switch 
> and check out the internals.  Mine once needed a clean many years ago, it 
> had a rusty build up in it that was affecting a switch.
> 
> While you have it apart, solder up the corroded wire in the connector 
> behind the cardboard behind that throttle butterfly.  When you open the 
> connector, you will see that one of the corner connections is corroded, or 
> possibly even starting to melt!  Check it closely and add 150mm of suitable 
> wire, bypassing the connector.  This causes intermittent stopping of the 
> fuel pump.  Every twin spark seems to suffer eventually.
> 
> Cheers,
> david
> 1989 ALFA75 TS.

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