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Aug 24th, 2023
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Joined: Apr 2011
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L - Learner Plates On
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OP
L - Learner Plates On
Joined: Apr 2011
Posts: 134 |
Does anyone know where the engine temperature sensor is on a 1990 +8 EFi? I've fitted the new water pump and lost the temperature gauge. I've found a sensor on the block but nothing is connected to it and there's no obvious loose connector. Presumably the ECU is getting a temperature reading from somewhere. Wiring diagrams for the early 3.9 +8's are non-existent though GoMoG have some on their website.
Thanks
1990 +8 Connaught Green
1970 Lotus Elan S4 SE
1973 Lotus Europa TC/Special
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Joined: Sep 2014
Posts: 2,272 Likes: 7
Talk Morgan Expert
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Talk Morgan Expert
Joined: Sep 2014
Posts: 2,272 Likes: 7 |
My 1999 +8 (which is Hotwire not Flapper EFi) has the water temperature sensor for the gauge in the radiator, not the engine. If you removed the radiator to install the new pump have you checked the connections with the electrics. One set is the otter switch which signals the need for the fan , and the other is the temperature gauge. One is at the top of the radiator , the other at the bottom.
I agree that the ecu probably gets its reading from elsewhere (someone like Mike Smith (Teknome on here) is the guru on the electronics, I hope he will be along soon to advise.
Andy G
1999 +8 , Indigo Blue.
Ex-John McKecknie/Mike Duncan 1955 +4 racer.
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Joined: Dec 2017
Posts: 2,041 Likes: 71
Talk Morgan Expert
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Talk Morgan Expert
Joined: Dec 2017
Posts: 2,041 Likes: 71 |
The water temperature sender on my hotwire 1994 +8 is on top of the engine block (vertical orientation) at the front behind the distributor, the fuel temperature sender is to the left of this (horizontal orientation) in the fuel rail. Sometimes when the two sensors electrical connections have been removed they can be swapped over when being reconnected and cause problems for the ECU. The only connections and temperature sender on the radiator is for the fan.
Last edited by britmog; 15/08/21 04:04 PM.
Bruce
1964 4/4 Series V Comp (Megan)
1994 +8 (Maurice)
2013 M3W (Olga)
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Posts: 35,777 Likes: 468
Tricky Dicky Member of the Inner Circle
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Tricky Dicky Member of the Inner Circle
Joined: Dec 2009
Posts: 35,777 Likes: 468 |
2009 4/4 Henrietta
1999 Indigo Blue +8
2009 4/4 Sport Green prev
1993 Connaught Green +8 prev
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Joined: Apr 2011
Posts: 134
L - Learner Plates On
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OP
L - Learner Plates On
Joined: Apr 2011
Posts: 134 |
Found it! The single wire from the sender goes through the offside wing valence behind the alternator, strange routing!
Last edited by CJB; 16/08/21 04:31 PM.
1990 +8 Connaught Green
1970 Lotus Elan S4 SE
1973 Lotus Europa TC/Special
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Joined: Oct 2007
Posts: 310
Learner Plates Off!
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Learner Plates Off!
Joined: Oct 2007
Posts: 310 |
The most useful document for the EFI is a copy of the LR Disco wiring diagram, that shows the various sensors, injectors, IACV, and the connection to the ECU. So while it may not provide the detail of the physical location it does answer the question regarding what sensors exist. If you would like a copy send me a private message with your email address.
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Mike Smith
2007 +4
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