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Strange fbh scenario
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Felstmiester
 


Member Since: 12 Dec 2016
Location: Hertfordshire
Posts: 149

England 2006 Discovery 3 TDV6 HSE Lux Auto Java BlackDiscovery 3
Strange fbh scenario

Don’t know if anybody has had this?

I’ve just put a fbh remote on the disco. Last week I got in it and turned the key as normal. It started but ticked over extremely lumpy and had no power when pressing go pedal. I switched off and on again and it was fine. First time it’s done this. I then realised 10 mins before I walked out to start it i’d Blipped the fbh remote just out of it being a new thing. It wasn’t cold out I just thought I’d give it a try. Since then the wife’s been using the car as normal obviously without fbh remote and it’s been fine. Yesterday morning I thought I’d give the fbh remote a blip again 10 mins before starting. Again had the lumpy tick over and no power. This time it took a few cycles of switching off and back on until it fired up as normal.
This morning was the coldest it’s been all year here. I thought I’ll give blipping fbh remote a miss. Got in turned the key, waited a couple of seconds and it fired up as normal.

Might be a complete fluke but it seems when fbh is fired up before starting it causes this issue. I’ve searched the starting and ticking over lumpy issue and most threads come down to contaminated fuel ie water in the diesel. Could the fbh running before start up cause this in anyway?

This has only happened twice and both times fbh has been fired up previously. I will give it a couple more goes this week to check if pattern continues but it seems to me the fbh may be the problem.
  
Post #18758865th Nov 2017 10:57 am
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beanie
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Member Since: 12 Mar 2011
Location: In the garage messing with something
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England 2013 Discovery 4 3.0 SDV6 GS Auto Fuji WhiteDiscovery 4

Firstly it's not the FBH , it's you Whistle 10 mins is not enough time, you need 20-30 mins, so what's happening is your partly raising the water temp, enough to fool the car into thinking its warm and as such preventing part of the glow plug pre heat cycle, but as the car starts it instantly cools and runs lumpy.

If you watch the temp gauge before you turn it over it will have risen above cold, then on start up instantly drop back

Give it more time to really warm the water Thumbs Up
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Post #18758885th Nov 2017 11:13 am
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Felstmiester
 


Member Since: 12 Dec 2016
Location: Hertfordshire
Posts: 149

England 2006 Discovery 3 TDV6 HSE Lux Auto Java BlackDiscovery 3

Beanie your bang on. Just found this after a lot of searching.



I'm sure I recall some threads, possibly on here, a long while ago saying some people were experiencing rough startup with the FBH causing the ECU to think the cylinders were warmer than was the case. The theory being that the FBH will cause the coolant to be warmer than the cylinders (as heat is coming from former to latter) versus the normal condition of coolant being cooler than the cylinders.

Is it possible the FBH could make cold starting worse as ECU will trigger insufficient retardation of the injectors.

When it gets to zero or below I'm finding it helps to cycle the ignition a couple of times, which I'm assuming will cause whichever glow plugs are working to heat (partially) a second/third time.
I'm also assuming that this won't help the day that the remaining glow plugs suffer their demise.
Hey, ho. The old technique of heat, penetrating oil, 1/4 turn out, 1/8 turn back will hopefully get some out without breaking.
  
Post #18758895th Nov 2017 11:18 am
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Felstmiester
 


Member Since: 12 Dec 2016
Location: Hertfordshire
Posts: 149

England 2006 Discovery 3 TDV6 HSE Lux Auto Java BlackDiscovery 3

Ok. What are the bas early fbh controllers set to time wise? I’m sure I read 30 mins. I powered fbh up this morning ( very icy out ) and let it run it’s course and still got the lumpy start up??
  
Post #18762816th Nov 2017 3:38 pm
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Narpy
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Member Since: 18 Jul 2011
Location: Stockport
Posts: 6107

2005 Discovery 3 TDV6 S Manual Cairns BlueDiscovery 3

When you have the lumpy start up you need to observe where the engine temperature gauge is at because if your FBH has properly warmed the engine, you shouldn't have a lumpy start. Wink

Once correctly warmed, the engine management won't allow the glow plugs to fully heat as it believes the engine is warm enough for a start up. I suspect you're doing something wrong and the engine is actually still cold, OR you have another underlying problem as yet un-diagnosed.

Lets hope it's not the latter. Thumbs Up
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Post #18763046th Nov 2017 4:09 pm
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Felstmiester
 


Member Since: 12 Dec 2016
Location: Hertfordshire
Posts: 149

England 2006 Discovery 3 TDV6 HSE Lux Auto Java BlackDiscovery 3

Ok I’ll check it out in the morning. I must say I didn’t time how long the fbh was running this morning but I’m assuming it was 30 mins as shortly after blipping remote i checked it was running and when I went out to start it I’d say it was over 30 mins and it had gone off. I didn’t look at temp gauge but on the first start even though it was running lumpy the heat blowing at windscreen started thawing the ice immediately so I’m almost certain it must of been up to temperature.

I can understand as said above if fbh was only running for 10 mins but most stuff I’ve read leaving it to do the 30 min duration does the trick.

When I say it runs lumpy I don’t mean just running a bit lumpy like some do on cold start for a few seconds then are ok. I’m talking it’s sound like it’s running on 3 cylinders and won’t rev at all.
  
Post #18763516th Nov 2017 5:33 pm
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