 | Home > Td5 > TD5 temperature gauge fluctuating |
 
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| Laurie Member Since: 22 Feb 2008 Location: Sussex, England Posts: 2897   
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Just before it goes to the red it sometimes fluctuates rapidly which may lead to it going to zero. Driving ar 60mph with a caravan on the back is hardly the time to closely monitor the gauge!   |
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30th Jan 2013 6:55pm |
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| excossack Member Since: 22 Feb 2012 Location: North West Posts: 5743  
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Added an extra earth from the earth stud in the seatbox to the screw/bolt holding the ECU in place. And then I ran another earth from the earth stud to an earth block I have for additional wiring which is earthed to the 2nd battery and this battery is earthed to the main battery...So I think that's a good earth.
Next thing I am thinking of is an earth from the chassis(where the earth from the battery comes outs and mounts) to the engine block. Is there a good earth point on the block or will anywhere do ? 1999 Defender TD5 110 Regards John M0VAZ Econet Station 48 no clock |
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31st Jan 2013 3:33pm |
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| excossack Member Since: 22 Feb 2012 Location: North West Posts: 5743
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I have done another earth connection, this time from the white earth connection from behind the coolant expansion tank to the earth stud in the drivers seat box.
Time will tell. 1999 Defender TD5 110 Regards John M0VAZ Econet Station 48 no clock |
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1st Feb 2013 1:29pm |
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| excossack Member Since: 22 Feb 2012 Location: North West Posts: 5743
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Well after doing the additional earth connections. During a 40 mile trip up some A & B roads the gauge was OK.
On the trip back down the motorway the gauge did its normal trick of dropping to the off position and then after stopping and starting the engine it returned to normal for a few miles then started fluctuating again... Back to it checking wiring. I think I have spare temp sensor that came from a FPR. So I might try swapping the sensor out. 1999 Defender TD5 110 Regards John M0VAZ Econet Station 48 no clock |
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3rd Feb 2013 7:55pm |
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| stuckinmud Member Since: 23 Jan 2013 Location: monmouthshire Posts: 7 
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sorry my previous post incorrectly referred to fuel pump relay but looking back at td5 haynes manual the fuel pump relay is the third non yellow relay in the area under drivers seat.
the two yellow relays are referred to as the main relay and heater plugs relay. it was one of these two yellow relays which had gone bad but was fairly easy to diagnose by swapping the two yellow relays over until i could purchase a new one. gauge flickering disappeared instantly |
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9th Feb 2013 11:27pm |
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| excossack Member Since: 22 Feb 2012 Location: North West Posts: 5743
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Interesting as my fuel pump relay appears to be in the fuse panel section behind the gear stick.
I will have another look tomorrow. Can these relays be swapped with standard relays? or are they specific to LR? 1999 Defender TD5 110 Regards John M0VAZ Econet Station 48 no clock |
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10th Feb 2013 12:16am |
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| Laurie Member Since: 22 Feb 2008 Location: Sussex, England Posts: 2897
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I tried Halfords relays and they didn't work.
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10th Feb 2013 12:44am |
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| stuckinmud Member Since: 23 Jan 2013 Location: monmouthshire Posts: 7
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in my td5 they were ford relays which i sourced from my local car parts suppier via the part number on the relay. have a look under the drivers seat for the two yellow relays. it was one of these causing the problem and swapping them over caused the problem to disappear. i then took the cover off the faulty relay to find the contacts were burnt confirming the problem.
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10th Feb 2013 1:37am |
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| excossack Member Since: 22 Feb 2012 Location: North West Posts: 5743
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Now its not raining or snowing, I had a look at the car. Replaced the coolant temp sensor with one from a Fuel Pressure Reg and checked the wiring. From what I could tell all was OK.
Had a look under the drivers seat and I have two relays. Yellow and Black. The yellow looks like a standard relay, but the black looks standard but has bigger terminals that plug into the relay socket. With both of these relays unlplugged the glow plug warning light didn't illuminate and the car cranked but would'nt started. So will keep an eye on the needle and see what happens. 1999 Defender TD5 110 Regards John M0VAZ Econet Station 48 no clock |
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16th Feb 2013 3:44pm |
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| 238kirk Member Since: 03 Nov 2012 Location: Doncaster Posts: 233 
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Any joy with this problem? I went on a run today and my temp gauge was flicking abit and would drop off to the bottom as though it wasn't working, also it was a real pain to start from warm, when it was turning over it was almost starting but just not quite and the gauge was jumping around too, just wondering if my problem could be similar to yours
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24th Feb 2013 5:00pm |
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| excossack Member Since: 22 Feb 2012 Location: North West Posts: 5743
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I think its too early to say, but at the mo the temp gauge is behaving itself after changing the temp sensor. I am due a good run soon (going from near Liverpool to Blyton, North Lincs) so that will be a good test.
Not sure on the starting. Mine used to play up starting from warm or not starting at all just clicking and that turned out to be the starter motor. But the temp gauge didn't bounce around while cranking 1999 Defender TD5 110 Regards John M0VAZ Econet Station 48 no clock |
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24th Feb 2013 5:52pm |
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| excossack Member Since: 22 Feb 2012 Location: North West Posts: 5743
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Well after a 300 mile round trip on the M6 and A66 the temp gauge did not flicker at all
To achieve this, I put it down to swapping out the coolant temp sensor.....and the car feels quicker as well Would swapping out the coolant temp sensor make the car feel quicker? 1999 Defender TD5 110 Regards John M0VAZ Econet Station 48 no clock |
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2nd Mar 2013 9:59pm |
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| me@td5.org Member Since: 16 Jan 2011 Location: Warwick Posts: 856 
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Something someone said to me implied that it could. If the engine is not getting up to temperature (or at least ECU thinks it is not) it doesn't give you full power. I'm not certain on this but sounds sensible.
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2nd Mar 2013 10:07pm |
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| excossack Member Since: 22 Feb 2012 Location: North West Posts: 5743
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If its anything like my old Lada Niva 1700i, the coolant temp sensor went faulty and the car over fuelled and caused fuel consumption to increase. 1999 Defender TD5 110
Regards John M0VAZ Econet Station 48 no clock |
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2nd Mar 2013 10:10pm |
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