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914World.com _ 914World Garage _ 1.7 D-jet Cyl head temp sensor #

Posted by: Brian_Boss Nov 3 2005, 07:53 PM

I have traced my driveability problem (long story) to a cylinder head temp sensor that is intermittentently open. The current sensor has the 270 Ohm resistor in series which I thought was only for the 2.0 but my engine is a 1.7.

What I need to know is what sensor part number do I need and should I keep the resistor. My ECU is a 0280000015 (022906021B) which I believe is correct for my engine. My MPS is a 0280100019 (022906051A) which I'm not sure about but seems to work OK.

Any recommendations?

Thanks,
Brian

Posted by: ejm Nov 3 2005, 10:09 PM

You should find what you're looking for on http://members.rennlist.com/pbanders/DJetParts.htm

Is the 911 still for sale? that color combo is sweet

Posted by: smg914 Nov 3 2005, 10:13 PM

Head temperature sensor 1970 thru 1974, 311 906 041 A

Pressure Sensor 1.7, 022 906 051 E

Posted by: Brian_Boss Nov 3 2005, 10:24 PM

So is it a problem to stick with the MPS I have? I did not see it listed on Brad's site. Is it for a non Porsche application?

Is the resistor possibly a DPO bodge to compensate for the wrong MPS.

Should I get rid of the resistor with the 041A sensor?

Thanks

Posted by: Brian_Boss Nov 3 2005, 10:29 PM

Yes, the 911 is still for sale. It's actually nicer now - I've fixed several things. I'm about to start agressively marketing it and through it on ebay if it doesn't sell.

Know anyone in the market????

Posted by: smg914 Nov 3 2005, 10:39 PM

The Bosch part number for your cars pressure sensor should be: 0280100049

From what I understand, the resistor in line with the head temp sensor make the engine run richer. If your engine is running too rich then I would remove the resistor. However, if your car is running too rich, it more than likely is a bad (or the incorrect) pressure sensor.

Posted by: SLITS Nov 4 2005, 10:40 AM

10/69 to 07/71:
Up to 6/70...ECU 0 280 000 007 (VW Pt # 022 906 021..interchange 013 / 032 / 037)
From 07/70..ECU 0 280 000 015 (Por / VW Pt # 022 906 021

CHT ............. 0 280 130 012 ( VW Pt # 022 906 041)

10/69 to 04/70 MPS ............. 0 280 100 003 ( VW Pt # 022 906 051)
05/70 to 07/71 MPS..........0 280 100 019 ( VW Pt# 022 906 051 A..interchange w/ 049 and Pt # ends in 051 E)

08/71 to 07/72

ECU....0 280 000 037 (Por / VW Pt # 022 906 021 E)
CHT.....0 280 130 012
MPS.....0 280 100 041(interchange with 049....VW Pt# 022 906 051 E)

07/72 to 10/73
ECU.....0 280 000 040 (Por / VW Pt # 022 906 021 E..interchanges with 037)
CHT.....0 280 130 012
MPS.....0 280 100 049 (VW Pt# 022 906 051 E)

After 10/73 no more 1.7s were produced. 1.8s began in 11/73

This otta confuse you enough....................

Posted by: Brian_Boss Nov 4 2005, 02:44 PM

QUOTE
This otta confuse you enough....................

Quite the opposite - that pretty much clears it up. Thanks Ron.

It looks like my ECU and MPS are a correct combo and I need to get an 012 CHT sensor and ditch the resistor.

One handy thing about that resistor, it provided me a "limp home" mode when CHT failed. Just short it to ground and it ran well enough to drive the car. I don't know if this would work on a car that is supposed to have the resistor.

Posted by: SLITS Nov 4 2005, 03:43 PM

QUOTE (Brian_Boss @ Nov 4 2005, 01:44 PM)
One handy thing about that resistor, it provided me a "limp home" mode when CHT failed. Just short it to ground and it ran well enough to drive the car. I don't know if this would work on a car that is supposed to have the resistor.

I was told by a "rebuilder" of FI parts that if you took a paperclip and hooked it into the CHT lead outta the FI harness and grounded it, it would function like a hot CHT and the car would run....and no, I have never tried it.