Search the Community

I really need help but you all know that anyway. Maybe some chemical assistance is needed. Right to the problem. Picked up a 2001 Nissan Stagea with a dead engine. Scored a good second hand engine and installed it without drama. Did about 500k's and it developed a problem, started as a miss and has slowly got worse. As it stands now it just cuts out about mid throttle, firing every now and again, comes right as soon as you lift the pedal. So far I have discounted by replacement or testing. Sensors where checked and found to be the same, did find a broken injector plug so swaped out the small bit of loom that was damaged. Lift pump, replaced. Direct injection pump, replaced. Plugs, replaced. Coils, replaced. Throttle body, replaced. Injectors, Checked for flow and found to be good. Blanked of the Swirl control valve. Cleaned every conection and earth in the engine bay. Had the inlet off cleaned out checked for leaks and made sure the small inlet butterflys are working. Checked the inlet and vacume lines are leak free. Had it into the Nissan guys to check the error codes, Mass Air Flow sensor and Swirl control valve came up. I've now had two different MAF sensors in it, one second hand and a new one, I have also taken the blanking plate out for the swirl control valve so the CEL is now of but the symptoms are still there. Had the Oxy sensors checked. Variable cam timing, would have come up when error codes where read. Timming chain, again it would have come up as an error. Fuel. ran the tank as low as I dared and filled with 98 octane. Replaced the in tank filter. Bleed the fuel system. Tried manual shifting the gearbox in case it was something to do with the kickdown function. Removed the air filter. Can't be the fuel filter, there isn't one fitted in these, came as news to me but there you go. Had the throtle body of and cleaned the gallerys out. Made sure the Fly By Wire is moving the throtle butterfly all the way. I doubt the ECU is the problem as the engine runs well other than this problem, good responce and normal fuel use. Put the pedal to the floor and left it there to see if it clears, didn't help. To put it mildly I have found this extreamly frustrating I've near put a hammer through the windscreen at times. I've spent dam near as much as I payed for the car and replacement engine together for no gain not to mention about 200 hours of my life I will never get back. Any one have an idea of what to look at next, or should I just bung a block of wood under the pedal?