Flack
Member Since: 06 Sep 2006
Location: Preston Lancashire
Posts: 6307
  
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I would think that fooling the sensor will lead to over fuelling, would it not ?.
Flack 
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 14th Dec 2022 6:07 pm |
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Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10673
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Yeap. Just to get it running.
Then the switch is changed and ecu reads the real temp.
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| 14th Dec 2022 6:30 pm |
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Flapper
Member Since: 04 Feb 2015
Location: Gloucester
Posts: 352
 
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just reading one of the reply's about Peugeot starting better in the cold could this be something that Gap could offer in the iiD tool. You can tell it wont start as soon as you turn the key as it sounds different.
Maybe they could move the fuel map so its not at 0 but -1 or -2 (this is what the 5k resistor does)
I have no idea how to contact Gap though.....Pete do you know? or is it bell?
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| 15th Dec 2022 10:03 am |
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Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10673
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I did float that idea a year or more ago. It didn't go down well.
Even if GAP wanted to do it, or considered if was a sensible thing to do, you have to remember GAP charge about £200 for a re-map, (and the tool is £500 if you don't have one)
So suddenly a 15p resistor and push button look a more sensible option.
For info,
The 2.7 Jags and 3.0 Landrovers have hardware to monitor glowplug operation. So as soon as one fails I guess it flags up a fault code or ECU light. Hopefully the owner then gets them changed before they get scooted up or winter arrives
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| 15th Dec 2022 12:35 pm |
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Knightfire
Member Since: 15 Dec 2022
Location: South Coast
Posts: 3
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Hi guys
I have read all your remarks regarding the cold start issue, and eagerly consumed the 5k ohm resister fix. I have a RR Sport,
Pretty sure it's the same engine largely, I couldn't start it today, so tried the hot water trick, if started fine .......so was thinking about how to get a more autonomous method of the resister trick, so
How about wiring a relay, standard type, into the starter circuit at the ignition switch, that energises when the starter is operated, that connects the resister, ! Hey presto no button needed, unless you wish to isolate the function in the summer.
Any thoughts guys?
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| 15th Dec 2022 10:33 pm |
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Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10673
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I guess there may be some limitations. Will it start when the engine is really hot?
Will it start at normal temp.
But if you want to experiment. Go for it !
I would think fitting the relay near the battery would be sensible
The starter relay is near there.
But first you need to see if it starts ok at a rsnge of temperatues
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| 15th Dec 2022 10:39 pm |
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Knightfire
Member Since: 15 Dec 2022
Location: South Coast
Posts: 3
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Maybe a water temp sensor, into expansion tank, to disable the relay when the coolant is hot?
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| 15th Dec 2022 10:57 pm |
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Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10673
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Now that is getting silly.
There is something simple and British about a resistor and button.
You know it’s likely to work when it’s bloody freezing
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| 15th Dec 2022 10:59 pm |
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Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10673
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The ecu may take a temperature snapshot before it starts cranking to decide on fueling. So there is a small chance it won’t work
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| 15th Dec 2022 11:09 pm |
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Knightfire
Member Since: 15 Dec 2022
Location: South Coast
Posts: 3
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| 15th Dec 2022 11:18 pm |
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Unbeliever
Member Since: 28 Aug 2022
Location: South Yorkshire
Posts: 27
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Pete K wrote:The ecu may take a temperature snapshot before it starts cranking to decide on fueling. So there is a small chance it won’t work
You're correct Pete. From my testing with my variable potentiometer and the momentary button there is definitely a delay between adjusting the pot, and the instrument cluster needle moving. Seems to take a snapshot/reading every 20 seconds or so and then adjusts the needle.
BTW, using my Autel AP200 I was able to adjust the pot so it was fooling the ECU into thinking the coolant was at 23 deg. C, which seems to be the sweet spot for my engine (when the instrument cluster was reading -5 deg. C and the coolant temp (with the engine having not run all day) was actually only -1 deg. C.) MY06 D3 SE 2.7 V6
MY15 FL2 SE 2.2 I4
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| 16th Dec 2022 11:55 am |
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Flapper
Member Since: 04 Feb 2015
Location: Gloucester
Posts: 352
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| -6 no glow plugs and a 15p resistor |
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Well last night it started at -6 that's the record for me so far. I must say it was a bit rough for about 30 seconds then it was fine.
Reading above about relays etc and extra temp sensors was pretty wild, reminded me of NASA spending millions on a pen that worked in space and the Russians using pencils.
My idea cost less than a fiver and it works for me.
All are welcome to use it at your own risk
Have a great Christmas all
Going to Snow again on Sunday
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| 16th Dec 2022 1:08 pm |
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Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10673
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Do you think it starts better at 23C rather than 70C (5K) ?
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| 16th Dec 2022 1:14 pm |
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Flapper
Member Since: 04 Feb 2015
Location: Gloucester
Posts: 352
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Pete i don't know as only use 5k (70 Degrees C) it starts  happy days.
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| 16th Dec 2022 1:17 pm |
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DIYmechanic
Member Since: 02 Jan 2023
Location: Cornwall
Posts: 4
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aja4x4 wrote:I would suggest you get the glow plugs replaced, you can feel when they are about to snap
The ones that i have had problems with have loosened off but then went tight due to carbon build up on the tips, if you cant get them out using gentle force tighten them back up and leave that one.
You may find you can get four or five out which will make a big difference to the starting. A couple of the plugs are a real pain to get to and i have seen just the other four changed on a couple of engines and they were done by Land Rover dealerships.
I have changed a number of glow plugs on these engines without issues but i have also had some that have snapped.
The last ones i did were on my own vehicle and i used a good quality injector cleaner for a month before removing them in hope it would remove the carbon, all six came out but i would need to repeat this a number of times on other engines to be sure it made a difference.
Can you recommend a good quality injector cleaner? (I take it this is an additive poured into the fuel tank…)
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| 3rd Jan 2023 7:33 pm |
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