Rnp jumps up and down from 900rnp to 400 rnp

[MIChAEL.S]

Hi.. i have an Auris 2009 1.4 d4d 6 speed manual (auris year model 2010) and i have one problem, especially when its cold. When it starts .. sometimes its perfect.. runs perfect .. but sometimes the rnp of the car goes up and down continusly .. from 900rnp to 400rnp .. and then at some point turns off.. if you put the airconditioning .. the problem its bigger. The engine light its on. Also some times .. when its run .. and you are moving .. the engine light turns on.. and the engine goes off. When you are trying to start it again ... does not start. If you disconnect the Battery and put it again.. the engine is normal again and you can turn the engine on. I put it in the computer and says that has low fuel pressure problems.. anyone has any idea what is going on ? The fuel pump metering shows 300 pressure .. and everything shows good. The strange thing is that the problem is not always ... it comes (sometimes 3-4 times a day and you must disconnect the Battery and connect it again in order to start up the engine again) and sometimes for 2-3 weeks .. their is not a problem at all ... sometimes .. every 2-3 days... 

Anyone with any answers to that ? Thanks a lot.. Michael

[xrhstosgr]

Hello The symptoms you describe point to problems related to the fuel filter, fuel pressure valve, fuel pump or even injectors. It's rare but the oxygen sensor may also be to blame Fault codes are not necessary to prevent this type of damage that I am telling you above, you must check very carefully every part of the car that you relate to the power supply, and not only

[MIChAEL.S]

The fuel filter has been change 3 times and the problem is still going. Fuel pump with the live metterings is ok. (I dont know the fuel valve.)The injectors ... when we metter them .. the cylinder 2 and 3 was + 1 and -2 . The cylinder 1 and 4 .. was -8 and +6 . Yes .. i see that we have 1.4 differece .. because the one has a problem and the other is trying to balance it but .. if that was the problem ... as i see it .. the problem must always be there .. i dont have always problem .. no even i the starting point... the car is ok with starting on .. and if he do the problem .. with the reset of the Battery disconnection .. the problem is gone untill the next time.