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I Supported Toymods
Location:
Nthn Beaches, Sydney
Registered:
October 2004
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Water temp gauge holding position
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Thu, 21 October 2004 05:39
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Hi guys, need a bit of advice.
The water temp gauge in my sx is behaving wierdly, when the car starts to warm up (not as soon as you turn it on) the gauge goes gradually all the way to the top and stays there as long as its got power. When you turn it off it falls again, but whats confusing me is that if you turn the ignition on again while the gauge is falling it stops right where it is and wont move from there. Turn it off and it falls again, on and it stops and holds again.
I've got a 20V in, running standard loom and computer, and it's been doing this ever since the swap. I've checked all wiring, but the only wiring relating that was touched was the single wire going to the sender, none of the wiring has been touched in the dash loom. I even checked the diagrams and the damping earth. I've unplugged the sender so now it doesn't do anything, but it's really pissing me off cause i can't figure out why it's behaving like it is.
I've tested both senders from 100kw and 20v in hot water, both read very similar resistances over whole temp range, and wired up out of engine gauge still rooted even with old one back in. (Can't use it anyway cause of big difference in size.) Also tried wired up in water, gauge reads nothing at air/room temp, but put either of them in hot water and it goes right up, but won't come down as the water cools right back down.
So, i've established it's not the senders, or the cooling system doing something wierd, so it's got to be either wiring or possibly i've fried the gauge itself? I tried to get the dash out and check it out, but i ran out of time and cracked the shits with it and haven't touched it since.
Any ideas?
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Location:
Bundaberg, Qld.
Registered:
May 2002
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Re: Water temp gauge holding position
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Thu, 21 October 2004 09:33
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the signal wire is earthing out somewhere.
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I supported Toymods
Location:
Perth, WA
Registered:
May 2003
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Re: Water temp gauge holding position
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Thu, 21 October 2004 09:42
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yerp
id say that is the problem
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I Supported Toymods
Location:
Nthn Beaches, Sydney
Registered:
October 2004
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Re: Water temp gauge holding position
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Thu, 21 October 2004 09:54
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I checked that cause i figured that would be the prob 1st up, but i'll check it again.
The lug on sender had broken off so i soldered the wire to the sender, would this cause a prob or is it poss i earthed to the body (of the sender) with the solder? I was careful about that though and checked it, thought it was ok...
Also, if the signal was earthing wouldn't the gauge go back up when i turned the power back on? Instead of staying at halfway or wherever you catch it at? It would be like the sender being really hot all the time and so real low resistance right?
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Location:
Bundaberg, Qld.
Registered:
May 2002
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Re: Water temp gauge holding position
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Thu, 21 October 2004 20:43
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yeah actualy thats true, if it were shorted out it would/should go straight up whenever the ign is turned on.
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I Supported Toymods
Location:
Nthn Beaches, Sydney
Registered:
October 2004
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Re: Water temp gauge holding position
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Fri, 22 October 2004 01:10
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Yeah, but if the engine is cold, or the sender is sitting in a tray of cool water, it stays at the bottom of the gauge...
Its really starting to piss me off that i can't figure this out, anybody had anything similar?
Thanks for the ideas
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I supported Toymods
Location:
Perth, WA
Registered:
May 2003
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Location:
Adelaide
Registered:
August 2003
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Re: Water temp gauge holding position
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Fri, 22 October 2004 08:03
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i got the same problem..but i am gonna run an aftermarket water temp..halfway doing it..will let u guys know
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Location:
Adelaide, SA
Registered:
June 2004
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Re: Water temp gauge holding position
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Fri, 22 October 2004 11:04
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If it was earthing somewhere it would just spike to the top straight away. Same as with a fuel guage. It happens as the resistance would be very low, and therefor it goes to the top. So I suspect that is not the problem. Problem may be with guage itself. Mechanics of a temp guage are pretty crappy. Well old ones anyways.
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