 Cylinder Head Temperature Sensor, Disconnect Scenario? |
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| JawjaPorsche |
 Nov 12 2018, 04:05 PM
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#1
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Advanced Member  Group: Members Posts: 3,463 Joined: 23-July 11 From: Clayton, Georgia Member No.: 13,351 Region Association: South East States  |
My 73 1.7 FI engine starts normally. The AAR works great then my engine really runs rough until the engine warms up: usually three miles of driving. Especially bad in cold weather. A friend who also has a 914 suggested I disconnect the Cylinder Head Temperature Sensor to see if that would help and maybe isolate the problem.
Was wondering what to expect if I disconnect it. Needless to say, your input would be greatly appreciated. Thank you in advance. |
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| BeatNavy |
Nov 12 2018, 04:21 PM
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#2
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Certified Professional Scapegoat Group: Members Posts: 2,924 Joined: 26-February 14 From: Easton, MD Member No.: 17,042 Region Association: MidAtlantic Region 
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QUOTE(JawjaPorsche @ Nov 12 2018, 06:05 PM)  My 73 1.7 FI engine starts normally. The AAR works great then my engine really runs rough until the engine warms up: usually three miles of driving. Especially bad in cold weather. A friend who also has a 914 suggested I disconnect the Cylinder Head Temperature Sensor to see if that would help and maybe isolate the problem. Was wondering what to expect if I disconnect it. Needless to say, your input would be greatly appreciated. Thank you in advance. No, your engine will flood almost immediately with CHT disconnected. It may not even start. He's probably talking about (or may be thinking about) disconnecting the T1 (ambient air sensor). Disconnecting that will richen the mixture a little through the whole warm-up range. That's probably a useful test, but it's not a great long term fix. Better option is to get a CHT spacer from 914LTD. That will slow down the CHT warm up and give you a richer mixture longer while your engine warms up. |
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| JawjaPorsche |
Nov 12 2018, 04:31 PM
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#3
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Advanced Member Group: Members Posts: 3,463 Joined: 23-July 11 From: Clayton, Georgia Member No.: 13,351 Region Association: South East States |
QUOTE(BeatNavy @ Nov 12 2018, 06:21 PM) QUOTE(JawjaPorsche @ Nov 12 2018, 06:05 PM) My 73 1.7 FI engine starts normally. The AAR works great then my engine really runs rough until the engine warms up: usually three miles of driving. Especially bad in cold weather. A friend who also has a 914 suggested I disconnect the Cylinder Head Temperature Sensor to see if that would help and maybe isolate the problem. Was wondering what to expect if I disconnect it. Needless to say, your input would be greatly appreciated. Thank you in advance. No, your engine will flood almost immediately with CHT disconnected. It may not even start. He's probably talking about (or may be thinking about) disconnecting the T1 (ambient air sensor). Disconnecting that will richen the mixture a little through the whole warm-up range. That's probably a useful test, but it's not a great long term fix. Better option is to get a CHT spacer from 914LTD. That will slow down the CHT warm up and give you a richer mixture longer while your engine warms up. What a cool idea! I will check out the CHT spacer! Thanks! |
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Posts in this topic
JawjaPorsche Cylinder Head Temperature Sensor Nov 12 2018, 04:05 PM
TheCabinetmaker It won't run with it disconnected. Sounds more... Nov 12 2018, 07:06 PM
pilothyer
It won't run with it disconnected. Sounds mor... Nov 12 2018, 08:47 PM
JawjaPorsche
It won't run with it disconnected. Sounds mor... Nov 13 2018, 04:08 AM jim_hoyland The AAR is easily bench tested... :) Nov 13 2018, 06:55 PM Jamie
The AAR is easily bench tested... :)
Testing by... Nov 13 2018, 07:23 PM jim_hoyland
The AAR is easily bench tested... :)
Testing b... Nov 14 2018, 06:45 AM |
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