1972 280SE 4.5L timing/vacuum

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knucklebuster - 29 Apr 2007 19:47 GMT

Can anyone tell/reference info on the vacuum advance/retard aspects of
the Starting Valve, Thermal
Time Line Switch, Supplemental Air Valve, Cooling Temp Sensor, &
Switch-Over Valve/relay, for the above mentioned car? It goes from
purr to cough & back & I suspect the ingition timing-vacuum continuum.

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Tiger - 29 Apr 2007 21:01 GMT

I would suspect the points in the distributor... much more common problem.

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knucklebuster - 29 Apr 2007 22:44 GMT

> I would suspect the points in the distributor... much more common problem.

Sorry, failed to mention Petronix electronic ignition.

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Richard Sexton - 30 Apr 2007 01:57 GMT

>Can anyone tell/reference info on the vacuum advance/retard aspects of
>the Starting Valve, Thermal
> Time Line Switch, Supplemental Air Valve, Cooling Temp Sensor, &
>Switch-Over Valve/relay, for the above mentioned car? It goes from
>purr to cough & back & I suspect the ingition timing-vacuum continuum.

Before you mess with that have you verified the injection rack moves freely?

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Richard Sexton | Mercedes stuff: http://mbz.org
1970 280SE, 72 280SE | Home pages: http://rs79.vrx.net
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Karl - 30 Apr 2007 02:07 GMT

Injection rack on a 72 280SEL 4.5?!?

That engine has EFI......

I would suspect the cold start valve first. When it idles rough, clamp off the hose at the cold
start valve. If it smoothens out, replace the cold start valve.

If it does not help, I would remove the distributor and take a look at the trigger points. They may
have oil on them......

> >Can anyone tell/reference info on the vacuum advance/retard aspects of
> >the Starting Valve, Thermal
[quoted text clipped - 3 lines]
>
> Before you mess with that have you verified the injection rack moves freely?

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