Discovery 3 2.7 TDV6 Will Will Not Rev Over 1000 rpm
If you have come here from my newbie hello post thank-you.
Where do i start.
I have a 54 plate discovery 3 2.7 TDV6, which broke down on the mortorway last month (alternator failure). Being a reasonably confident home mechanic and have rebuilt several race car engines in the past i decided to to the works to the family car myself. I also decided that if i was going to replace the alternator i would go the whole way and replace both front belts and the rear belt (thanks Disco_Mikey great wright up).
Anyway changed rear belt first but broke a fuel line which i believe was the return to tank line. New item bought 18 quid.
Alternator went in well cam belt change went well new tensioner and both idle pullies changed. Engine was cranked over by hand six of seven turns and then checked again for any cam pully creep. I will note at this point i did not need to loosen the cam pullies during the cam belt change.
Front part of the engine went back togethor and all was well. Back to the fuel pipe i broke, in order to change it i had to remove the EGR throttal body which houses the butterfly and was simply disgusted with what i found in the housing! One hour later it was all sparkly clean and i then continued with changing fuel line. 10 mins later all fitted as a simple push fit connectors.
Every thing back togethor and battery installed and this is where i went a little wrong. Having owned several diesel vans in the past i just assumed the disco was a self bleeding fuel line system. I cranked the engine and nothing just kept turning over. Half hour later and searching on this forum i found out fuel line needed purging. I have subsequantly purged the system using the little bleed valve.
The car fired in to action albeit a little noisy until things all settled down. when i reversed the car off the drive and engaged drive i found the car had developed a big problem. THE CAR WILL NO LONGER REV OVER 1000RPM EVEN WITH PEDEL FLAT ON THE FLOOR. The car did not even have the power to get back up my drive i had to engage low range and creep it up the drive which took about 20mins.
What on earth has gone wrong. Have i broke anything when i took the EGR throttle body off. I have checked and double checked all electrical connections over and over and the cams were completly locked when i changed the cam belt.
Having not got a fault finder i can't even ask the car whats wrong and i do not know whether a ecu reset will work.
I think there is a sensor in the outlet of the air box for the air mass sensor, when I did my alternator and started the engine before i refitted the big pipe across the top of the rad mine would not rev either, is it possible that this is either not properly connected or got damaged in some way?Altox GSM FBH controller thread
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Owner of the original "Beanie" grille
D4 & RRS style D3 grilles made to order
6th Sep 2012 7:55 pm
Stuart Page
Member Since: 06 Sep 2012
Location: Kent
Posts: 5
Hi beanie,
If you are refering to the black sensor connected to the front part of the engine next to the long air intake pipe attached to the air box yes its still secured and from what i can tell undisturbed.
The what I think is a sensor looks like a small glass bulb like an LED just inside the air box outlet that the big pipe connects to, not sure of its purpose but it was as if the engine would not rev because this thing was in daylight?
I'm sure an expert will ne along shortly, there are loads of good and well knowledgeable members on here Altox GSM FBH controller thread
IID Pro MV License - D3, D4 & RRS - Enabling, Updates, D4 & RRS Timed / Remote Climate, D4 Bluetooth fitting
PM me for details
Owner of the original "Beanie" grille
D4 & RRS style D3 grilles made to order
6th Sep 2012 8:15 pm
Disco_Mikey
Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20727
EGR valves are dead. Blank them off and be done with them
either that or you may have left something unplugged...My D3 Build Thread
IID Pro MV License - D3, D4 & RRS - Enabling, Updates, D4 & RRS Timed / Remote Climate, D4 Bluetooth fitting
PM me for details
Owner of the original "Beanie" grille
D4 & RRS style D3 grilles made to order
6th Sep 2012 8:20 pm
Stuart Page
Member Since: 06 Sep 2012
Location: Kent
Posts: 5
Disco_Mikey,
I thought about them and have ordered blanking plates today just incase, but its been sitting on the drive and they were all working fine before the alternator went. Do they have that much effect on an engine? What on earth are they for but to create carbon deposits in areas you really do not want carbon deposits.
6th Sep 2012 8:29 pm
Disco_Mikey
Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20727
Have seen them loose throttle all together, didn't even have enough power to pull itself onto the ramp...
They are an emissions related part, but on the early models, you get away with blanking them with no ill effects My D3 Build Thread
If you have found they can cause a complete loss of power i will start with blanking them off and have another go, can i keep you posted?
In the mean time what if i was to unplug the EGR hoses from the butterfly housing would that have any effect therefore allowing the car to breath alittle better?
Reagrds
Stuart
6th Sep 2012 8:43 pm
Disco_Mikey
Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20727
Yea, no worries
The lack of throttle comes from the engine sucking in whatever it can, and as the EGR system is closer, it draws in the waste exhaust gas before the fresh air, and pretty much strangles the engine...
You can temporarily blank the valves off with a couple of 2p pieces to confirm/eliminate the valves are at faultMy D3 Build Thread
Member Since: 21 May 2020
Location: Burton-on-Trent
Posts: 7
Stuart Page wrote:
Thanks Mikey,
If you have found they can cause a complete loss of power i will start with blanking them off and have another go, can i keep you posted?
In the mean time what if i was to unplug the EGR hoses from the butterfly housing would that have any effect therefore allowing the car to breath alittle better?
Reagrds
Stuart
Hi mate im having the same problems that you described in this forum did you manage to find out what was wrong with it in the end ????
Could you fill your profile in with details of your car, and give us some more information - D3/4 Manual/Auto..mileage, service history, have you read codes, if so with what result etc..?
NJSSAm I Gammon or Woke ? - I neither know nor care.
2016 Discovery 4 Landmark
2011 Mercedes Benz SL350 (R230)
1973 MG B GT V8 - 3.9L John Eales engine, 5 speed R380 gearbox, since 1975.
1959 MGA roadster - 1.9L Peter Burgess Engine - 5 speed gearbox
Past LRs - Multiple FFRs, Discos & a Series I - some petrol, some diesel,
none Electric or H2 fuel cell - yet.
There are 10 types of people in this world: Those who understand binary, and those who don’t.
22nd May 2020 7:44 am
darrind
Member Since: 04 Jul 2008
Location: In A World of My Own!
Posts: 2863
Did this ever get resolved?Must stop buying shiny toys....
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