 Ballast Resistor for CHT 73 2.0L, Assistance Please. |
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| 913B |
 Aug 16 2011, 10:41 AM
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#1
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Senior Member  Group: Members Posts: 847 Joined: 25-April 05 From: South Bay/SoCal Member No.: 3,983 Region Association: None  |
Could someone please tell me where the ballast resistor for the cylnder head temp sensor is located. I am not sure if my friends car has it or not.
Is it inline with the CHT sensor ? Pictues of the resistor would be fantastic !! Trying to help my friend's 73 2.0L with surging after warmed up to 230F. His TPS contacts are clean. Only occurs above 230F. Any clues ? As always. Thank you |
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| DRPHIL914 |
Aug 16 2011, 10:46 AM
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#2
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Dr. Phil Group: Members Posts: 5,768 Joined: 9-December 09 From: Bluffton, SC Member No.: 11,106 Region Association: South East States 
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QUOTE(porsche913b_sp @ Aug 16 2011, 12:41 PM)  Could someone please tell me where the ballast resistor for the cylnder head temp sensor is located. I am not sure if my friends car has it or not. Is it inline with the CHT sensor ? Pictues of the resistor would be fantastic !! Trying to help my friend's 73 2.0L with surging after warmed up to 230F. His TPS contacts are clean. Only occurs above 230F. Any clues ? As always. Thank you check the A.A.R.- ( d-jet?) i had the same thing and placed an in-line resistor on that circuit- used a variable pot. to change the idle mix which helped richen the idle mix but- the real problem was the AAR not closing down when system was warm, works like giant vac leak and you'll get this surge when hot--- phil |
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| Dave_Darling |
Aug 16 2011, 12:02 PM
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#3
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914 Idiot Group: Members Posts: 14,991 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California
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Putting a resistor in line with the AAR doesn't make sense. It would just drop the current going through the heating coil in the AAR, making it take longer to close. I guess that could be useful...
The CHT resistor is found in line with the CHT sender. Just follow the wire out from the engine tin near the #3 spark plug. If it goes to a plastic box connector, then into the wiring harness, there is no resistor. If it goes to a box connector, then a short piece of wire with a big lump in it, then another box connector, that lump is the resistor. It will be very close to the CHT sender itself; none of the wires is very long. --DD |
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| orange914 |
Aug 16 2011, 12:27 PM
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#4
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http://5starmediaworks.com/index.html Group: Members Posts: 3,371 Joined: 26-March 05 From: Ceres, California Member No.: 3,818 Region Association: Northern California |
QUOTE(porsche913b_sp @ Aug 16 2011, 09:41 AM) Could someone please tell me where the ballast resistor for the cylnder head temp sensor is located. Is it inline with the CHT sensor ? Trying to help my friend's 73 2.0L with surging after warmed up to 230F. Only occurs above 230F. Any clues ? The resister is connected to the CHT inline with the wire The CHT resister was only on the 73' 1.7's (to help the one year only "universal"- 2.0 or 1.7 ECU work W/ 1.7) NOTE: unless my brain is working in reverse today, the resister effects the idle/low rpm mix. I was saving a nice (unobtainium (IMG:style_emoticons/default/biggrin.gif) ) O.E.M. resister in case I needed it when I converted to a 2056. I still have it if your interested, P.M. me. |
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| JeffBowlsby |
Aug 16 2011, 01:16 PM
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#5
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914 Wiring Harnesses Group: Members Posts: 8,533 Joined: 7-January 03 From: San Ramon CA Member No.: 104 Region Association: None
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| 913B |
Aug 16 2011, 01:26 PM
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#6
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Senior Member Group: Members Posts: 847 Joined: 25-April 05 From: South Bay/SoCal Member No.: 3,983 Region Association: None |
QUOTE(Jeff Bowlsby @ Aug 16 2011, 12:16 PM) Thank You Jeff !! |
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| 913B |
Aug 16 2011, 01:31 PM
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#7
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Senior Member Group: Members Posts: 847 Joined: 25-April 05 From: South Bay/SoCal Member No.: 3,983 Region Association: None |
QUOTE(Philip W. @ Aug 16 2011, 09:46 AM) QUOTE(porsche913b_sp @ Aug 16 2011, 12:41 PM) Could someone please tell me where the ballast resistor for the cylnder head temp sensor is located. I am not sure if my friends car has it or not. Is it inline with the CHT sensor ? Pictues of the resistor would be fantastic !! Trying to help my friend's 73 2.0L with surging after warmed up to 230F. His TPS contacts are clean. Only occurs above 230F. Any clues ? As always. Thank you check the A.A.R.- ( d-jet?) i had the same thing and placed an in-line resistor on that circuit- used a variable pot. to change the idle mix which helped richen the idle mix but- the real problem was the AAR not closing down when system was warm, works like giant vac leak and you'll get this surge when hot--- phil Yes D-jet, Thanks Dr Phil, I will certainlt look into that. |
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