Overheating problem or something else?

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Farmer Brown

Active Member
Posts
107
Location
Edinburgh
Hi

I was doing a long run with the trailer today and something a bit odd happened. Took a heavy load one way and no problems. Was coming home empty and you come up a long hil for a couple of miles. I did have my foot planted in 5th the whole way as I was passing people, doing about 60ish, suddenly power cut out and the temp gauge shot into the red. I let off the throttle and then the needle went back to where it was and power came back. It cut out for maybe less than a second. I cruised a mile or so to a lay-by and stopped thinking the engine was hot and needed to cool so sat with it running for a while. Thing is engine didn’t smell hot and now seems fine.

Someone told me that the temp gauge basically has 2 positions, in the middle and in the red and is not accurate at all but I’m sure I read that if it shoots up like this it could be another problem but I can’t find anything.

Is a TD5 running a Dynachip map, no EGR and deCAT. Has done 196,000 Miles, engine untouched. No oil in loom that I can see, it does need its washers in the injectors done as it is poor start when cold sometimes.

Any thoughts?
 
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Have tried searching a different way and it seems it might be a faulty yellow relay under the seat or perhaps a bad earth between the engine management and seat box. Anyone agree with this?
 
If beside the towing you are on bigger than standard dimension tyres too this happening might be quite normal, the temp gauge has actually 3 positions:
1. up to 1/4 to 70*C
2. at the middle between 70 -119*C
3. above middle from 120*C
keeping it floored in 5th uphill on a long hill can make the ECT grow with up to 30*C can be increased more by some factors like bigger tyres, the weight of the trailer, the steepness of the hill, big spots in front of the radiator, etc,

if you have bigger tyres or even if not but if you tow much better fit additional ECT and EGT gauges to know when to ease the throttle before reaching 120*C

the fact is that when the ECT input reaches 120*C and the gauge leaves the middle the ECU cuts fuelling, it's named engine overheat protection... if your top hose was not solid and the coolant at normal level the only thing to check is if the viscous fan is not shot which means try to stop it with a rolled up newspaper when the radiator is hot and if you can you need a new one

btw is it D2 or Defender?
 
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Sorry it’s a defender 90.

I am running 235/85/16 so I do have bigger tyres.

If fitting a replacement engine temp temp gauge would I just remove the original gauge and put the replacement in the same spot in the dash using the same wiring?
 
Farmer Brown said:
If fitting a replacement engine temp temp gauge would I just remove the original gauge and put the replacement in the same spot in the dash using the same wiring?
Click to expand...
no, the best is to fit additional aftermarket gauges, the sensors are good enough to fit them like i did without much hassle or cutting the hose see this https://www.landyzone.co.uk/land-rover/td5-remap-file-by-email.328327/page-3#post-4229206 but i'm gonna get rid of the displays soon cos i bought this https://www.ebay.com/itm/DEFI-Advan...e=STRK:MEBIDX:IT&_trksid=p2055119.m1438.l2649 which is just waiting to be installed
 
sierrafery said:
if you have bigger tyres or even if not but if you tow much better fit additional ECT and EGT gauges to know when to ease the throttle before reaching 120*C
Click to expand...

+1 - Deffo fit proper gauges - and IMHO, both ECT and EGT are worth having. If you were to also fit a boost gauge, you might be surprised how much gentler you can be, and still make as much progress.
 
That’s a serious but if kit you’ve bought there. Where are you going to fit that? Would have thought you’d be struggling for space!

Yeah I think an extra instrument cluster with a temp gauge, exhaust gas temp gauge and a boost gauge might be an idea. I don’t want my engine failing on me!
 
As surprised as I was about how quickly and how high the EGT can get, I was equally surprised how quick it goes down when you lift off the accelerator a bit
 
Farmer Brown said:
That’s a serious but if kit you’ve bought there. Where are you going to fit that? Would have thought you’d be struggling for space!

Yeah I think an extra instrument cluster with a temp gauge, exhaust gas temp gauge and a boost gauge might be an idea. I don’t want my engine failing on me!
Click to expand...
That display is not huge but it will go on the dash near the instruments

tom1979 said:
As surprised as I was about how quickly and how high the EGT can get, I was equally surprised how quick it goes down when you lift off the accelerator a bit
Click to expand...
yes, so does the ECT if you'll watch it, can rise with 15-20*C on a heavy and long climb then drop fast back downhill, not so fast as the EGT but still amazing
 
Farmer Brown said:
That’s a serious but if kit you’ve bought there. Where are you going to fit that? Would have thought you’d be struggling for space!
Click to expand...
here's one option like a friend of mine did
attachment.php


though i'm considering the other side of dash too or with a small cut in the instrument's binnacle it can go on the same side close to the windscreen... i'm still thinking
 
Ah I didn’t notice you had a disco. Yeah lot more room there. Would be cool having one of them but maybe a bit fancy for the ol girl I’ve got!
 
Farmer Brown said:
Hi

I was doing a long run with the trailer today and something a bit odd happened. Took a heavy load one way and no problems. Was coming home empty and you come up a long hil for a couple of miles. I did have my foot planted in 5th the whole way as I was passing people, doing about 60ish, suddenly power cut out and the temp gauge shot into the red. I let off the throttle and then the needle went back to where it was and power came back. It cut out for maybe less than a second. I cruised a mile or so to a lay-by and stopped thinking the engine was hot and needed to cool so sat with it running for a while. Thing is engine didn’t smell hot and now seems fine.

Someone told me that the temp gauge basically has 2 positions, in the middle and in the red and is not accurate at all but I’m sure I read that if it shoots up like this it could be another problem but I can’t find anything.

Is a TD5 running a Dynachip map, no EGR and deCAT. Has done 196,000 Miles, engine untouched. No oil in loom that I can see, it does need its washers in the injectors done as it is poor start when cold sometimes.

Any thoughts?
Click to expand...

I cant comment on the temp gauge but the sudden and quick lack of power sounds like overboost. It goes into a sort of limp node where you cant accelerate past 50mph, but as soon as you turn the ignition off and back on its reset and your back to normal acceleration.

I think overboost is quite common on a a remapped engine, mine has a dynachip remap to and would do this all the time, under very hard acceleration, and usually uphill. Weirdly it doesn't do this at all since I replaced my straight thru mid box with the original restrictive silencer
 
sierrafery said:
yes it sounds like it if you didnt read carefully the first post where the OP said

then somebody else who understands the Td5 management said

.... nothing to do with overboost i this particular case ;)
Click to expand...

Terribly sorry your royal pompousness', ill get back to groveling in the coal shed
 
I'm sorry sir, i reviewed this post and i can see now that my answer sounds worst than in intended... my sh*t sense of humour needs some upgrade i think :oops:
 
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