my nissan patrol has not been used for a while and is down on power now.i changed the fuel filter but to no avail.Ihave been sending you this questinn for the past few days now and you have not made any attempt to give me any answer.please reply.
the airbox is clear and the wastegate on the turbo is ok
Thanks for getting back to me.
Do you ever get an smoke when this happens?
Does the service engine light come on at all?
no smoke except when starting from cold.no service light at all.just low power and moRe noticable when climbing hills
Thanks for th eprompt response.
Ideally here when you have a lack of power and no trouble codes it's generally caused by one of the previously mentioned items (fuel filter/air leak/wastegate opening/boost leak.)
The only other common failure that doesn't generally leave a trouble code is the MAF sensor, but it generally causes a bit more obvious symptoms then you describe and they generally get worse the higher the RPM's.
All that aside something is still obviously going on by the computer is just not detecting the fault and since there is no black smoke, i think we can rule out the EGR failure as well since it usually causes a bit of smoke on acceleration. With out actually being ac the vehicle and looking at the fuel maps and intake readings its hard to say for sure whats going on here, but it sounds alot like a fuel pressure issue. That could be from the control valve on the side of the pump or the in the tank pump itself.