Ian1976
Member Since: 25 Jan 2012
Location: Warrington
Posts: 1
  
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| Discovery 3 engine surging |
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Hi, my wife has a d3 and I noticed that when driving it the engine sort of surges and the rev counter moves with the surge as you driving, hope someone can help.
Also updating to d4, got rear lights with resistors andcalso led front lights, can anyone give me a link or advice on the wiring or the front and back?
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 25th Jan 2012 6:49 pm |
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Flack
Member Since: 06 Sep 2006
Location: Preston Lancashire
Posts: 6234
 
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You need to check the hoses on the intercooler and turbo for splits then check to see if all the clamps are tight on them. It might also be an egr problem.
Flack 
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| 25th Jan 2012 10:35 pm |
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neilthesparky
Member Since: 16 Mar 2009
Location: reading
Posts: 24
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| Re: Discovery 3 engine surging |
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Ian1976 wrote:Hi, my wife has a d3 and I noticed that when driving it the engine sort of surges and the rev counter moves with the surge as you driving, hope someone can help.
Also updating to d4, got rear lights with resistors andcalso led front lights, can anyone give me a link or advice on the wiring or the front and back?
does it do it all the time? and if you have cruise control does it do it when thats on?
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| 30th Jan 2012 10:14 pm |
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bw_306
Member Since: 31 Jan 2012
Location: Canterbury
Posts: 132
 
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Hi i have just purchased a D3 and think i am experiencing a very similar issue. the rev counter seems to fluctuate only very slightly and can just about be felt, but after a long period trying to remain at a constant speed, can make you feel quite ill! this still occurs when cruise control is active but again only very slightly but very noticable. I see there are many threads about this type of fault but i cant say that i am experiencing any major judders or slipping, simply rev fluctuations, most noticeably when trying to maintain around 50mph.
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| 6th Mar 2012 10:00 pm |
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character
Member Since: 01 Jan 2008
Location: wiltshire
Posts: 5779
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to both of you and no doubt echoed by others who read this post........
First step
Get the car plugged in to see what fault codes, if any are registered - print info
Step 2
Whilst plugged in check the cylinder/injector balances if no fault codes are registered - print info
Step 3
If the above readings for the cylinder/injector balances are noticeably higher than on a number of cylinders then next stage would be to get a "compression test" done from someone who has the adaption to do this thru the injector ports (normally this would be done by removing the glowplugs but if one breaks then yer into having the bodyshell taken off the chassis which is very expensive in consumables. You will have to pay for new fuel feeds for the injectors themselves (but can re-use the clamps) but best to purchase these prior to taking the car in so you have them to hand.
I can only stress how much money/time off work I have wasted over the past 3 weeks trying to find a cheap way and second guess what might be going on from just standing there and looking at it. You know you have an issue, that's why yer posting so use the cars diagnostics to get a head start - we are all here for yer but please, please, please get on top of it before it gets on top of you otherwise you'll end up with this 
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| 6th Mar 2012 10:19 pm |
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character
Member Since: 01 Jan 2008
Location: wiltshire
Posts: 5779
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even more importantly, make sure yer come back and let us know how yer getting on - step by step if you need a second opinion but this site works best when everyone participates 
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| 6th Mar 2012 10:23 pm |
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Bodsy
Site Sponsor
Member Since: 06 Nov 2006
Location: In the Clubhouse
Posts: 21361
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Tbh, sounds like you just need a gearbox flush. Bodsys Brake Bible
D4/D3 Remote FBH heat kits
BAS Remaps/ EGR Blank
Transmission Flush
Software updates/enabling
Clock/ SNOTM /3Flash / 4x4Info /BT Update /Service Reset/Error Codes / Gearbox Reset
See It Here
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| 6th Mar 2012 10:42 pm |
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bw_306
Member Since: 31 Jan 2012
Location: Canterbury
Posts: 132
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i was just going to ask what the reasons for suspecting an engine fault over a gearbox fault were? the car has had a new turbo a month before i bought it
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| 6th Mar 2012 10:45 pm |
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character
Member Since: 01 Jan 2008
Location: wiltshire
Posts: 5779
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ahhhh, a new turbo probably suggested as a cure but didnt work so owner got shot before sinking more money in to it 
As is common, "its this not that" approach to diagnosis - honestly get the fault codes read and then we can all go from there
BTW, might want to hold off yer D4 conversion till yer sorted this issue 
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| 6th Mar 2012 11:00 pm |
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euangibson
Member Since: 24 Dec 2010
Location: Borders
Posts: 11027
 
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I had a Volvo that displayed those "surging" symptoms....it was the Mass Air Flow Sensor.....would have thought you would get some engine management lights though ?  "Better to remain silent and be thought a fool,than to speak out and remove all doubt" ?.....what rubbish...
Locking rear E-diff
RLD spare wheel protector & sump guard
Extended roof rails
Series 111 mudflaps
Black side tubes,grill and vents
Timed climate remote
Hids4u interior lights
D4 Firenze my2012 HSE
D3 Java 2005 SE manual (sold,sadly,thanks for the memories)
1966 '88 Series 2a....still starts in the morning better than I do...
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| 7th Mar 2012 8:11 am |
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sarumlight
Member Since: 07 Nov 2008
Location: Off the Plain
Posts: 1590
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I was just about to type the same: Ours had a problem with surging - as if you were coming on and off the power all the time. Also was down on power below 1500rpm so it was changing down for hills that it would normally climb in 4th no problem.
There was no fault code logged and no lights or messages on the dash.
If you unplug the MAF sensor then the engine management falls back to estimating the air flow. If the sensor is bad, then it's a night-and-day improvement
After running it with no MAF sensor you might have an engine warning light on because it needs the fault code reset.
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| 8th Mar 2012 9:29 pm |
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bw_306
Member Since: 31 Jan 2012
Location: Canterbury
Posts: 132
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What vehicle was this on sarumlight?
Getting mine plugged in on monday so will see what that shows up!
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| 9th Mar 2012 7:13 pm |
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sarumlight
Member Since: 07 Nov 2008
Location: Off the Plain
Posts: 1590
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It was our D3 - 2.7 TDV6 like yours
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| 10th Mar 2012 12:50 am |
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bw_306
Member Since: 31 Jan 2012
Location: Canterbury
Posts: 132
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Update.
Had the car put on diagnostics computer today. Only one fault code showed up, that being cylinder 6 fuel trim set to max. I think the code was PO2AE.
And the cylinder balancing information... They were all running around .98 - 1, apart from cylinder 6 which rose to a max of 1.17 at tick over. Injection system cleaner was recommended as a starting point.
Have unpluged MAF as suggested, and shows no difference in operation what so ever with the same surging issue.
I can easily stop the surging but changing down a gear in command shift, so this leads me to think that something maybe slipping when under load in a higher gear, (normaly just under 2000 revs) but will surge through out acceleration when under load. No gear box fault codes were stored in the system.
Does anybody have any ideas? New injector? Megaflush on the gearbox and glycol test?
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| 12th Mar 2012 12:45 pm |
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Bodsy
Site Sponsor
Member Since: 06 Nov 2006
Location: In the Clubhouse
Posts: 21361
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Bodsy wrote:Tbh, sounds like you just need a gearbox flush.
Bodsys Brake Bible
D4/D3 Remote FBH heat kits
BAS Remaps/ EGR Blank
Transmission Flush
Software updates/enabling
Clock/ SNOTM /3Flash / 4x4Info /BT Update /Service Reset/Error Codes / Gearbox Reset
See It Here
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| 12th Mar 2012 12:50 pm |
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