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RE: [T3] Idles on 2; runs on 4 (Update/recap/ SOLUTION!)


On 16 Mar 2006 at 3:43, Elroyyy@aol.com wrote:

> I've had this car for close to eight years now. It came to me with the 028 
> brain (that's Bosch part # 0280 000 028; VW part # 311 906 021E), matching "E" 
> pressure sensor (Bosch # 0280 100 116; VW # 311 906 051E) AND throttle valve 
> switch (Bosch # 0280 120 024; VW # 311 906 111E). It also came with the 311 905 
> 205L distributor. All of it had worked well together until this happened so I 
> thought it best to keep the part numbers the same.

The "E" PS is good for both '72 and '73, but the 028 brain was for '72 only, 
and originally came with the expensive vac adv/ret '72-only distributor. I 
suspect that the differences in the brain were minor and had to do with finding 
a way to meet emission requirements without the complicated timing proceedure 
that the expensive '73 dist required. The 048 E brain superceeded the 028 E 
brain, but the reverse is not true. It's unfortunate that VW marked both as "E" 
but they probably did it when the 028 was discontinued from their stock and 
simply replaced by the 048.

The 311 L dist is from '68-9 and is probably the best dist out there for our 
cars, but you should time it like a '68-9, since it has more advance (~30 deg) 
than the OE dist. If you time it like the OE '73 engine (5 deg BTDC) that will 
give you more advance (~35 deg) than is healthy for this engine, so the best 
thing to do is to time it to TDC, as was the spec for 68-9.

In general, the rule of thumb is that you should time your engine according to 
the spec of the distributor year.

-- 
Jim Adney
jadney@vwtype3.org
Madison, WI 53711-3054
USA

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