Member Since: 11 Mar 2012
Location: Johannesburg
Posts: 205
SDV6 Bouncing Temp gauge - HELP!
On a recent trip my temperature gauge has started bouncing which leads me to think there is possibly something wrong with the sensor itself as simply based on logic, temperature cannot drop that quickly.
More info on when the problem occurs: When driving uphill the temperature goes up, on the apex of the hill it stays and going downhill it drops back to normal. The engine does sound to be working harder when going uphill and the car does seem to lose power. It also happens when the gears are cycling often such as when driving in thick sand, gears going 2nd, 3rd, 2nd, 3rd.
I have checked the engine bay for signs of engine overheating, bubbling water, steam etc and none fo the above. Engine bay temp does not seem excessive either.
IIDtool BT does not read any faults which is also strange
The car drives as per normal and no issues...
I have had a dual gearbox flush done along with a double dose of DrTranny
Cat has been removed
Below is a video of the problem. Driving uphill, the road has quite a few bumps as its quite uneven so excuse the in car rattles.
Disco 4 SDV6 HSE with Compomotives, BFG 265/65R18s, BigCountry drawer system, Melvill & Moon covers, NL 52L fridge, FR Spare Wheel Carrier, FR Roof Rack, Tenco RTT, FR 50" LED Bar, dual spots, Lift Rods, Mantec Snorkel, C-TEK Dual batt system, 270 Ostrichwing, Maxtrax, Icom ID-5100, Icom ID-51 as secondary, IIDtool BT
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8th Jan 2018 9:13 am
dgardel
Member Since: 03 Nov 2009
Location: Greater Venice
Posts: 2025
Have you checked by "live values" the coolant temp with the IIDTool while driving (comparison between D4 Gauge and value read by the IIDTool)?
Air bubble/lock inside the circuit? try to degas it (remove the engine cover, there are two plastic cap for degas the circuit, and a 3rd on the coolant reservoir tank)Discovery 5 tdv6 HSE Corris Gray Outback Engineering Limited Edition
IID Pro MV License
8th Jan 2018 9:35 am
Jetlag
Member Since: 11 Mar 2012
Location: Johannesburg
Posts: 205
I did check the live values and they were fluctuating in the same manner which didnt make sense.
Will try degassing the system but can only do that when I am back home in a couple of weeks...
When the disco engine overheats, does it act the same way or does the temp stay at high?Disco 4 SDV6 HSE with Compomotives, BFG 265/65R18s, BigCountry drawer system, Melvill & Moon covers, NL 52L fridge, FR Spare Wheel Carrier, FR Roof Rack, Tenco RTT, FR 50" LED Bar, dual spots, Lift Rods, Mantec Snorkel, C-TEK Dual batt system, 270 Ostrichwing, Maxtrax, Icom ID-5100, Icom ID-51 as secondary, IIDtool BT
Follow my adventures on Instagram @XpeditionAfrica
8th Jan 2018 10:10 am
DSL Keeper of the wheelie bin
Member Since: 11 May 2006
Location: Off again! :-)
Posts: 72799
I had that with my D3, was because a large part of my radiator was packed solid with mud.
8th Jan 2018 10:21 am
Jetlag
Member Since: 11 Mar 2012
Location: Johannesburg
Posts: 205
@DSL, now that seems like a Viable option - We have been mudding a LOT recently! Will certainly have a look at thatDisco 4 SDV6 HSE with Compomotives, BFG 265/65R18s, BigCountry drawer system, Melvill & Moon covers, NL 52L fridge, FR Spare Wheel Carrier, FR Roof Rack, Tenco RTT, FR 50" LED Bar, dual spots, Lift Rods, Mantec Snorkel, C-TEK Dual batt system, 270 Ostrichwing, Maxtrax, Icom ID-5100, Icom ID-51 as secondary, IIDtool BT
Follow my adventures on Instagram @XpeditionAfrica
8th Jan 2018 10:31 am
DSL Keeper of the wheelie bin
Member Since: 11 May 2006
Location: Off again! :-)
Posts: 72799
Your intercooler will prob also be a mud brick. If you have access to an IID (other widgets are available) you can check coolant, boost and ambient temps to see what is going on.
8th Jan 2018 11:16 am
Jetlag
Member Since: 11 Mar 2012
Location: Johannesburg
Posts: 205
Yeah I do have an IIDtool - any guidelines I could follow?
Do you maybe have any tips on how to clean out the radiator & Intercooler?Disco 4 SDV6 HSE with Compomotives, BFG 265/65R18s, BigCountry drawer system, Melvill & Moon covers, NL 52L fridge, FR Spare Wheel Carrier, FR Roof Rack, Tenco RTT, FR 50" LED Bar, dual spots, Lift Rods, Mantec Snorkel, C-TEK Dual batt system, 270 Ostrichwing, Maxtrax, Icom ID-5100, Icom ID-51 as secondary, IIDtool BT
Follow my adventures on Instagram @XpeditionAfrica
8th Jan 2018 11:31 am
DSL Keeper of the wheelie bin
Member Since: 11 May 2006
Location: Off again! :-)
Posts: 72799
I replaced them, I kept the intercooler to clean it and sell it on but never got round to it and it was skipped.
Re temps, and as a non techie so from what I can gather, boost temp should only be a few degrees above ambient, much higher than that and the intercooler isn't doing its thing. Re cooling temp, I've seen numbers up to 108c charging up hills in warm weather, no light/warning. ISTR the warning is tripped at 120c. One way to check coolant temp sensor is that it, and all other sensors, should be at ambient when "cold" and engine not cranked.
8th Jan 2018 11:47 am
DiscoJeffster
Member Since: 27 Feb 2016
Location: Perth
Posts: 204
That is a clear indicator of an issue and is not an electrical fault. I would avoid stressing the engine like that if at all possible going forward. I think the suggestions about clogged cooling are reasonable but not so easy to resolve. High pressure water can help, but to get it all out you’ll likely have to remove the radiator to do it effectively - not a small job. As suggested it might be trapped air but you’d need to question how and why. Have you had anything replaced that might have cracked open the cooling system to let air in? There’s a really remote possibility of a thermostat failure as well to consider, but look at the above first before that.
8th Jan 2018 3:57 pm
Jetlag
Member Since: 11 Mar 2012
Location: Johannesburg
Posts: 205
I think rather than cleaning I will just replace the entire RAD pack and de-gas the circuit. This will be my step 1 in resolving the problem and yes, I will not stress the engine any further until its resolvedDisco 4 SDV6 HSE with Compomotives, BFG 265/65R18s, BigCountry drawer system, Melvill & Moon covers, NL 52L fridge, FR Spare Wheel Carrier, FR Roof Rack, Tenco RTT, FR 50" LED Bar, dual spots, Lift Rods, Mantec Snorkel, C-TEK Dual batt system, 270 Ostrichwing, Maxtrax, Icom ID-5100, Icom ID-51 as secondary, IIDtool BT
Follow my adventures on Instagram @XpeditionAfrica
9th Jan 2018 8:23 am
DSL Keeper of the wheelie bin
Member Since: 11 May 2006
Location: Off again! :-)
Posts: 72799
Remember my observation/advice is as a resident non-techie. I might be wrong, it has been known. It was a Tuesday in a galaxy far, far away. And it was raining.
9th Jan 2018 8:28 am
Jetlag
Member Since: 11 Mar 2012
Location: Johannesburg
Posts: 205
DSL, I hear you and noted
The advice a few have given along with my own logic, it makes perfect logical sense that there is a problem with the cooling and by replacing the RAD pack completely is step 1 in eliminating the problem.
I plan on keeping the car for a while to come so nothing wrong with having a few extra spares laying around. Disco 4 SDV6 HSE with Compomotives, BFG 265/65R18s, BigCountry drawer system, Melvill & Moon covers, NL 52L fridge, FR Spare Wheel Carrier, FR Roof Rack, Tenco RTT, FR 50" LED Bar, dual spots, Lift Rods, Mantec Snorkel, C-TEK Dual batt system, 270 Ostrichwing, Maxtrax, Icom ID-5100, Icom ID-51 as secondary, IIDtool BT
Follow my adventures on Instagram @XpeditionAfrica
9th Jan 2018 8:35 am
OJ
Member Since: 01 Oct 2017
Location: Loch Leven
Posts: 725
DSL wrote:
Remember my observation/advice is as a resident non-techie. I might be wrong, it has been known. It was a Tuesday in a galaxy far, far away. And it was raining.
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