 Cylinder head temp sensor |
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| sbruzek |
 Apr 2 2012, 07:32 PM
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#1
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Newbie  Group: Members Posts: 35 Joined: 17-January 12 From: United States Member No.: 14,024 Region Association: Upper MidWest  |
I need to test and potentially replace the CHTS. I see the lead to the sensor has a 2 inch long red "torpedo" looking device between 2 black connectors. It looks original as the 2 connectors are solid black with VW stamped on them. Anyone know what the red torpedo is and how the 2 black connectors come apart???
Steve |
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Replies(1 - 8)
| McMark |
Apr 2 2012, 08:09 PM
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#2
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
(IMG:style_emoticons/default/confused24.gif) The CHT sensor should be a small 'plug' with a single black wire coming off of it.
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| Dave_Darling |
Apr 2 2012, 08:31 PM
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#3
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914 Idiot Group: Members Posts: 14,990 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California 
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It's a resistor. I forget the value, Brad Anders' D-jet webpage will have the number. (240 ohms??) http://members.rennlist.com/pbanders
The plugs just pull apart. The sender wire and connector unplugs from the plastic housing on the resistor, and the resistor unplugs from the plastic housing on the wiring harness. --DD |
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| ape914 |
Apr 3 2012, 11:40 AM
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#4
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red locktite Group: Retired Members Posts: 240 Joined: 7-February 11 From: In front of a computer Member No.: 12,676 Region Association: None |
the torpedo is likely a inline resistor, used on the 1973 model 2.O liters. this added resistance which made the enigne run a bit richer than without.
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| Tom_T |
Apr 3 2012, 02:20 PM
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#5
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TMI.... Group: Members Posts: 8,318 Joined: 19-March 09 From: Orange, CA Member No.: 10,181 Region Association: Southern California
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QUOTE(Dave_Darling @ Apr 2 2012, 07:31 PM)  It's a resistor. I forget the value, Brad Anders' D-jet webpage will have the number. (240 ohms??) http://members.rennlist.com/pbanders The plugs just pull apart. The sender wire and connector unplugs from the plastic housing on the resistor, and the resistor unplugs from the plastic housing on the wiring harness. --DD Yup 240 ohm. If yours is a stock 73 2.0 EFI, then you'll need the resistor in line with the -017 CHT. Otherwise 74-76 2.0s use the -012 CHT with no resistor, which are still readily available from many P-car/914 parts sources. Rich at HPH may still have one of each NOS for the 73 2L. |
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| rmital |
Apr 3 2012, 02:35 PM
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#6
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Northeast optimist Group: Members Posts: 1,947 Joined: 12-December 05 From: Park Ridge, NJ Member No.: 5,268 |
QUOTE(Tom_T @ Apr 3 2012, 04:20 PM) .... Rich at HPH may still have one of each NOS for the 73 2L. nope...none left. just the 012. if you use the 012 on a stock 73 2L, do you still use the resistor? |
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| PancakePorsche |
Apr 4 2012, 02:35 AM
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#7
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Member Group: Members Posts: 236 Joined: 29-July 11 From: Southern California Member No.: 13,373 Region Association: None |
Factory installed 270 ohm resistor for 73 2 liter. Early 2.0 engines used 037 1.7 ECU and the resistor corrected idle mixture.
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| sithot |
Feb 24 2019, 10:12 AM
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#8
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Member Group: Members Posts: 446 Joined: 25-October 06 From: Virginia Member No.: 7,090 Region Association: None
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Old thread update. My "red torpedo" cleaned and updated resistor along with a factory replacement from Auto Atlanta.
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| Olympic 914 |
Feb 24 2019, 10:39 AM
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#9
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Group: Members Posts: 1,672 Joined: 7-July 11 From: Pittsburgh PA Member No.: 13,287 Region Association: North East States
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QUOTE(rmital @ Apr 3 2012, 03:35 PM) if you use the 012 on a stock 73 2L, do you still use the resistor? Nope.... The 012 CHT had a cold value of something like 3200 Ohm The 017 was more like 1600 ohm cold That's why they added the 270 Ohm resistor. If you use the resistor with the 012 you will be making it richer still. |
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