Range Rover Sport 2.7 TDV6 2005 - Poor performance below 2000 rpm - Fixed #
Posted by Martin Kelly on January 10, 2014, 11:10 pm
Year of Manufacture *: 2005 Engine Size and Code *: TDV6 2.7 ( Optional ) Scanner Used: IDS ( Optional) Fault Codes: None
Hi, car has done about 105,000 miles and had 2 new EGR valves fitted about 4000 miles ago (not by me) and has performed well up until last week. Throttle response up to 2000 rpm is extremely sluggish but above 2000 rpm it goes well. It starts perfectly every time, even when cold and runs quiet and smooth. Fault occurred over Christmas break and a neighbour code read it with Sealey type tool and got 'EGR fault' and then cleared it. No codes have returned since.
Live data showed EGR valves responding correctly, fuel presure at idle 210 bar and full throttle under load about 980 bar, boost max at 1.9 bar. I would have liked to have seen a bit more fuel pressure and boost really.
The customer was interested in having a BG intake cleaning service but I said this may not cure the problem but he decided to have it done. Top end performance improved but below 2000 rpm it was the same as before.
I then fitted new fuel filter and noticed that at initial start up FRP was about 270 bar and when at normal running temp. reverted back to 210 bar at idle. Road test showed max FRP of 1550 bar and now max boost of 2.3 bar but the performance below 2000 rpm was still very poor, almost no throttle response at all.
Also checked auto trans TCM - no codes.
I was now wondering if the EGR fault mentioned above was left over from when they were replaced and not cleared at the time. I then blanked off both the EGR valves to eliminate them completely - no improvement so they must be operating correctly.
I now have the weekend to decide which direction to proceed next week, any suggestions would be very much appreciated.
Thanks, Martin.
Re: Range Rover Sport - poor performance below 2000 rpm.
Hi Martin Its been years since i have fitted an egr blanking kit to one of these, but i do remember having to remove the air intake butterfly , when the blanks are fitted . Just 2 screws in the centre of the spindle. So it can get air when it thinks its getting egr . It may not be the same fualt , but hope that helps.
Graham
Re: Range Rover Sport - poor performance below 2000 rpm.
Thanks for your input but haven't had a chance to continue with it yet, hopefully at the end of the week. Mark, I have not had to deal with a digital MAF sensor before so this one will be a learning curve for me.
Hi, I read up on digital MAF sensors, frequency increases with output...not on this one, it decreased!
Thought I had blocked air filter box - all ok. Had a chance to look at a Range Rover V8 diesel and scoped both the MAF sensors and they decreased as well so this must be Land Rover norm, but my response on V6 was sluggish when driving.
Smoked the intake to check pipework to turbo and found small leak at a joint so fitted hose clip to seal.
MAF value at idle with EGR still blanked was 14 g/s. I wasn't sure what a good reading should be on one of these but comparing to smaller capacity diesels I felt it was a bit low.
I was then able to borrow a known good MAF off an identical vehicle - drove well.
Just fitted new MAF (£114.25+vat from LR dealer) and it goes like a rocket. New MAF at idle with EGR's shut showed 20 g/s. At idle with EGR's open 5% MAF is 19 g/s
on January 11, 2014, 10:31 am, in reply to "