I have a 2001 GT Xtrail petrol which has done 90,000km. This has the SR20VET engine with turbo and intercooler 280hp. It has an intermittent power loss usually at low revs around 40 to 60 km/h. I don't seem to ever get this problem at high speed. Pressing accelerator during this problem, engine does not respond. The turbo starts to wind up (sort of rumble roller bearing sound) but no power and speed remains same. Eventually picks up and then drives normally. Not using any oil or water and car is not overheating. Car starts fine. Suspect sensor or fly by wire system sensor fault. Any ideas would be appreciated.
Check the TPS (Throttle Position Sensor) and Accelerator Pedal Position Sensor, both of these sensor can go bust with time. If you're not getting any check engine light warnings you may need to physically measure the voltage output of both sensors to make sure they're still working. Voltage settings can be found in the ESM (electronic service manual)
Thanks for the replies. We have checked car on Nissan diagnostic system which shows no fault codes but has low voltage 1.8v on air flow sensor. Should be above 2.2v. We are going to change this first along with spark plugs. We will check throttle setting and turbo boost and see whether that shows anything. The exhaust emissions on this car is very 0.03 CO. Are these vehicles subject to Catalytic converter blockages?
Thanks for the input on the Xtrail power loss problem. Mechanic has now established that the turbo boost pressure intermittently drops to 7 psi cause by the waste gate coming open. This is causing the intermittent loss of power. Unable to determine why the waste gate is malfunctioning. So far have changed air flow sensor, oxygen sensor with no improvement. There are no fault codes when the car has been tested. Any ideas of what to change or test please?
Finally sorted this problem out. The mechanical linkage arm on the turbo had stretched causing the waste gate to become floppy and open at 4 psi resulting in complete loss of power. Adjusted the length of the linkage arm with four washers and tested back to correct setting with waste gate opening at 15 psi. Performance was still poor after re-fitting the turbo. The timing had been seriously advanced on the car presumably due to the turbo giving no power. It had been advanced from 15 to 3 deg TDC. Adjusted back to 15 deg TDC. Car back to normal with full power. Thanks for the input.
hi i have a 2004 extrail diesel ! sport x , and ive never had a problem with it untill now ! as i drove it to work this morning no problems ! parked it up and 6 hours later finnished work started car and now has no acceleration ! any help would be greatly appreciated
No there are no warning lights on at all , and i started it this morning just to move it to my garage and it accelerated fine , i will try to get a new fuel filter today just in case your right and its a bit blocked !
You might need to get your turbo adjusted like mine. It is a common fault with linkage arm to the waste gate stretching and effects both diesel and petrol turbo models. This causes the waste gate to open at low boost pressure causing intermittent loss of power. This is a very easy adjustment to make. Just stretch the brackets or add washers and check turbo on bench to make sure that the waste gate opens at the correct pressure.
cheers man !! i will try and have a look myself later on sunday and if its too complicated for me then i take to garage lol! bless you bro for the help as i would have never have guessed the problem , i will let ya know how i get on ! thanks again speedo6 !!!!!!!
My X-Trail GT seems to have developed this same problem. When cold, the turbo works fine but after driving for a while it loses all boost. It even seems to slow the car down as the engine struggles to pick up from low revs. Took it to the garage who couldn't find a problem (they only drove it when the engine was cold). Sounds to me like the wastegate is sticking open.
As I am not mechanically minded, I wouldn't know how to fix it myself. Is this something any reputable turbo servicing garage could do? Or will they try to hit me up for a new turbo?
This can be quite a tricky fault to fix. Is your car a GT model with the 280 hp motor? Your car sounds like it is going into limp mode. This is easy to establish as all you need to do when you get the fault is switch the engine off and start up again. If you get full power back then the car was in limp mode. The problem with the GT model is there is not many Nissan specialists who can fix this fault as it is not a common model. This could be an air leak in the system, air flow sensor fault, turbo fault, oxygen sensors fault, gearbox sensor or throttle sensors faults. Most likely it is a throttle sensor fault or air leaks in the system. It is a total nightmare to fix as there is usually no specific fault code. I am in NZ as well give me a call on 021654446 and I can give you a more detailed info on this fault.
Thanks for the quick reply, you're living up to your speedy name
Yes, I have the GT model and it was going great when I bought it but the fault has been getting progressively more common over time.
I will try turning it off and on again but I don't think it is limp mode as the engine still revs freely upto 7000rpm (I tried flooring it to see if the turbo would kick in).
It seems to start off ok, then after about 15 minutes it becomes intermittent then in another 15 minutes it doesn't work at all. When not working at all, the engine seems to labour and doesn't accelerate freely.
It is under warranty from the dealer I bought it from but they know little about turbos and even less about this particular engine. They flushed the hoses out and couldn't find a problem.
I will have another drive of it tonight and will probably call you tomorrow to discuss.
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