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Re: [T3] Injector interchangability?

On 2 Dec 2003 at 12:40, Martinez, Leon B Civ 203 wrote:

> Jim said ...
> I thought that ALL the D-Jet head temp sensors had the same 
> resistance. I'll have to see if I have the info on this anywhere 
> to prove this...
> Yes there are different resistances even for the type 3 of the same year,
> I have the original D-jet efi books that go over part numbers so they can pass the 
> smog regulations or running problems. If you go to a VW dealership the type 3 and type 4 
> have different part numbers even the years have different part numbers ,
> when you buy the part from the dealership , they even supply a special heat insulating
> washer in order to make the sensor colder and make the engine fuel richer when 
> it is required .

The parts list shows 3 different head temp sensors.

Only 2 of these are actual head temp sensors and they fit all type 3s, 4s, and 
914s. The only difference between them is the length of the wire. 68-9 got a 
long wire while all the others got a short wire, just because of where it is 
mounted. Later, the only replacement that VW sold was the long wire version, so 
this was sold for all of these applications.

There is a third number listed, for special circumstances, but even though it 
is listed as a temp sensor, it is actually just an in-line resistor to be added 
in series with the actual temp sensor.

The tolerances on the temp sensors are quite loose, so it's quite possible to 
get perfectly good sensors which still have a rather wide range of resistances 
at the same temp. I don't think I have any literature that talks about other 
cars with actual numbers, so I can't say what their resistance range is.

I thought the copper washer was just there to provide a soft washer that had 
good conductivity and would seal the threads to prevent corrosion. Every 
undisturbed-from-the-factory engine I've ever taken apart has had one of these.

Jim Adney, jadney@vwtype3.org
Madison, Wisconsin, USA

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