 Thermo time switch, Am I ok in FL to go without? |
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| Morph914 |
 Apr 14 2021, 06:37 PM
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#1
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Member  Group: Members Posts: 435 Joined: 22-August 16 From: St Augustine, FL Member No.: 20,326 Region Association: South East States 
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I just noticed I do not have the thermo time switch. Since I live in FL and will only drive in fair weather, can I go without this piece? From what I gather this sensor activates the 5th fuel injector during cold weather.
We occasionally get freezes here, but I wouldn’t be driving in these conditions anyway. Here is the bracket that holds the thermo switch.  |
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| BeatNavy |
Apr 14 2021, 07:01 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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Yes, your assumptions are correct. You can do without it.
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| robkammer |
Apr 15 2021, 10:50 AM
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#3
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Member Group: Members Posts: 179 Joined: 7-January 21 From: Vermilion Ohio Member No.: 25,049 Region Association: North East States |
Maybe a dumb question, but a fifth injector?
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| bdstone914 |
Apr 15 2021, 11:20 AM
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#4
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bdstone914 Group: Members Posts: 4,508 Joined: 8-November 03 From: Riverside CA Member No.: 1,319 |
QUOTE(robkammer @ Apr 15 2021, 09:50 AM)  Maybe a dumb question, but a fifth injector? The thermo time switch give a signal to the cold start valve ( fifth injector ) at temperatures around 40 degrees F to fire for a few seconds to assist with cold starting. |
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| Morph914 |
Apr 15 2021, 12:59 PM
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#5
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Member Group: Members Posts: 435 Joined: 22-August 16 From: St Augustine, FL Member No.: 20,326 Region Association: South East States
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Thanks guys (IMG:style_emoticons/default/piratenanner.gif)
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| 914_teener |
Apr 15 2021, 01:17 PM
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#6
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914 Guru Group: Members Posts: 5,193 Joined: 31-August 08 From: So. Cal Member No.: 9,489 Region Association: Southern California |
QUOTE(Morph914 @ Apr 15 2021, 11:59 AM) Just don't call your car a Challenger and you'll be fine. |
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| JeffBowlsby |
Apr 15 2021, 05:10 PM
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#7
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914 Wiring Harnesses Group: Members Posts: 8,470 Joined: 7-January 03 From: San Ramon CA Member No.: 104 Region Association: None
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A couple thoughts:
The Thermoswitch can activate at temps colder then ~40F, some of them down to 0F depending on the switch and on the assumption that it works at all. 311 906 161 : -12 to -18 deg. C / 10 to 0 deg. F 311 906 161 A : 0 to -10 deg. C / 32 to 14 deg. F 311 906 161 B : -2 to -8 deg. C / 28 to 18 deg. F 311 906 161 C : -6 to -14 deg. C / 21 to 7 deg. F When cold enough to activate and only when the engine is cranking, it creates the ground circuit completing the electrical signal circuit which activates the cold start valve, a special type of injector, often called the 'fifth injector'. In summer and in warm climates it is not needed and does not activate. But one might also consider removing the valve, and blocking off the air plenum mounting hole, to prevent richening the fuel mixture in the event the valve leaks, because it is still under fuel pressure even when not activated. |
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