twybrow
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| posted on 6/9/12 at 06:47 PM |
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Still having issues with Koso + ZX12 water temperatures
I posted a little while ago here about the erratic temperature readings I was
getting on my car. A brief summary:
- ZX12 engine with Polo rad, header tank (non-breathing) & Koso gauges - running with no problem since installed March 2012 (water temperature
consistently at 68-75 on the cruise, and raising to 90C on a hard run)
- Some time mid-July, I started getting erratic temperature readings (jumping 30+ degrees in a second, then back again, hovering above the upper limit
of the gauge etc - although it would then tend to hover around a more realistic value again shortly afterwards)
On the suggestion from the last thread, I changed the sensor to another one I had (it is the same age, but has only ever dangled in free air measuring
the outside temperature) - it seems to have reduced the instantaneous jumping, but the number is still al over the place. I may have imagined it, but
it seems to increase if I accelerate, and settle out to a normal value if I lift off - although this is by no means certain!
So, what do the collective think could be causing it? Air/steam in the system? Faulty water pump? Dodgy sender (stop being a cheap skate and buy a new
one!?)? Wrong level in the header tank? A blockage? Incorrect plumbing?
Any help greatly appreciated as I am really nervous that I am damaging my engine, or risk pouring boiling water everywhere if it is in fact running
over temperature.
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speedygonzales
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| posted on 6/9/12 at 07:30 PM |
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My guess is it's a wiring fault - possibly corrosion. Especially since you say it was working fine and then have started to have problems with
it. Give the pins / connections a good clean and see if you have any luck.
”Duct tape is like the force. It has a light side, a dark side, and it holds the universe together.” - Oprah Winfrey
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twybrow
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| posted on 6/9/12 at 07:46 PM |
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But they are connectors on the ends of a premade wire supplied with the gauges - I will double check the connections at each end of the wire just to
be sure. I would have thought a wiring fault would give no reading at all, rather than an intermittent reading... But I may well be wrong!
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Xtreme Kermit
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| posted on 6/9/12 at 07:59 PM |
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I had a dodgy earth behind the dash a while back that made the gauges swing round and back and then settle. Got worse over item until I cleaned up the
connection on the earth post.
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austin man
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| posted on 6/9/12 at 08:26 PM |
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brother in law has a similar problem with a gauge not KOSO though his problem turned out to be an air lock where the sensor was we assumed it must hav
ebeen steam build up causing the erratic nature
Life is like a bowl of fruit, funny how all the weird looking ones are left alone
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speedygonzales
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| posted on 6/9/12 at 08:27 PM |
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If you've got corrosion on a pin / terminal or for that matter a poorly crimped wire (I prefer soldered joints) it is quite possible to get an
intermittent fault. It's something easy to check and won't cost you anything.
”Duct tape is like the force. It has a light side, a dark side, and it holds the universe together.” - Oprah Winfrey
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twybrow
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| posted on 6/9/12 at 10:41 PM |
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quote:
Originally posted by speedygonzales
My guess is it's a wiring fault - possibly corrosion. Especially since you say it was working fine and then have started to have problems with
it. Give the pins / connections a good clean and see if you have any luck.
Speedygonzales I doth my cap at you sir! I pulled the wiring out, and I found that in one place, the wire has melted where it touched the block,
exposing the earth sheath, and I suspect also nicked one of the wires within it. I have cut out the damaged section, soldered it back up, and
re-attached the sheath. Fingers crossed for a run out tomorrow to check it, but I am hopeful!
Thanks for the input so far - I will report back on how successful it is!
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