MG Sports Cars

engine swaps and other performance upgrades, plus "factory" and Costello V8s

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DonB
Don Bonar
Prairie Village, KS
(80 posts)

Registered:
09/09/2011 10:06AM

Main British Car:
1971 MG-B 95 GM 3.4 V-6

Temp guage- intermittent
Posted by: DonB
Date: March 05, 2014 06:30PM

Sorting out the new car (3.4 GM, Holley 390, Edlebrock low profile manifold, E-Z wiring kit, TPI instruments) and am experiencing issues with temp sender/temp guage. When starting cold, no reading. but a single momentary short of the single connecting wire to ground, temp guage instantly gives you correct and continious reading.
Don't remember where we got the sender, but local auto parts store only carry GM replacements with two connector plug-in recepticle.

Ideas? I'm clearly not an electrics guy

Don B.


DiDueColpi
Fred Key
West coast - Canada
(1365 posts)

Registered:
05/14/2010 03:06AM

Main British Car:
I really thought that I'd be an action figure by now!

authors avatar
Re: Temp guage- intermittent
Posted by: DiDueColpi
Date: March 05, 2014 06:43PM

Probably not the sender Don,
I would suspect that you have a faulty ground at the gauge.
It needs that "kick" from grounding the sender to get it going.

Cheers
Fred


DonB
Don Bonar
Prairie Village, KS
(80 posts)

Registered:
09/09/2011 10:06AM

Main British Car:
1971 MG-B 95 GM 3.4 V-6

Re: Temp guage- intermittent
Posted by: DonB
Date: March 07, 2014 11:51PM

Fred,
Thanks you got me on the right path!
Turns out it was the Teflon tape I had applied to threads of sender, when I screwed it into the manifold. The "jump" overcame the very weak ground. BIG fix... removed tape!

Duh
Don B.
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pspeaks
Paul Speaks
Dallas, Texas
(698 posts)

Registered:
07/20/2009 06:40PM

Main British Car:
1972 MGB-GT 1979 Ford 302

authors avatar
Re: Temp guage- intermittent
Posted by: pspeaks
Date: March 08, 2014 02:20AM

Thanks guys, I never thought of that, better check to make sure I didn't tape mine. Side note on gauges, I just ordered a set of Speed Hut gauges with GPS speedometer to replace my mechanical Shark set. Now I have to find something to cover the cable hole on the transmission.


Paul


rficalora
Rob Ficalora
Willis, TX
(2764 posts)

Registered:
10/24/2007 02:46PM

Main British Car:
'76 MGB w/CB front, Sebring rear, early metal dash Ford 302

authors avatar
Re: Temp guage- intermittent
Posted by: rficalora
Date: March 08, 2014 06:24PM

Paul, if you have it you can just leave the one that wad in the tranny there, just not hooked up.


pspeaks
Paul Speaks
Dallas, Texas
(698 posts)

Registered:
07/20/2009 06:40PM

Main British Car:
1972 MGB-GT 1979 Ford 302

authors avatar
Re: Temp guage- intermittent
Posted by: pspeaks
Date: March 08, 2014 10:13PM

Thanks Rob, that's what Roger said too. I don't have it anymore but I can get another from our old closed down hot rod shop.

Paul


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