03 M45 looses power at about 2000 rpm then dies

[mizmac22]

Infiniti dealer first thought it was the air flow meter, replaced it, still did it. Cleaned fuel injectors and replaced cracked exhaust manifolds Next replaced the fuel pump, still did it, next swapped out onboard computer to check that, still did it. Put computer back in, computer completely died. Replaced with new one. Checking exhaust system now. No codes come up to tell them what is wrong. They've had it for a month now.

[Q45tech]

Just shows that technican are not engineers and that dealers don't have long term logging equipment to test everything or even most things.

They are not spending time on it because Nissan won't pay for diagnosis and then only a few hours at most even in warranty.

Still in warranty 6/70k? or extended to 100k?

Obviously an unmonitored electrical open circuit is turning off ecu or other critical inj/coil circuit.

You may have to create separate bypass power to circuits one at a time [keep alive ] after start run to narrow down what does fail.

A job for an electrical engineer [factory regional engineer].

[sr79labrat]

Is it throwing CELs? I would try to get a scan tool on it to check sensor readouts. Just my .02. Do they still have the car?

That sucks!Kyle

[mizmac22]

car is at 68k miles so still under original warranty. They are still working ...haven't heard anything in days.