Martinbros

car turns on fine. engine sounds healthy. Revs normally. But once I get on the gas half ways (50%) it feels normal and accerlates normal, once I press the gas pedal all the way down (100%) nothing happens. The car accelerates as if the gas pedal is still half way pressed. This has been going on for a month now. Getting p0031 and p0037 codes but that's all. Taken it to shops and that's resulted in Intake manifold gasket replacement/new fuel pump/new sparkplugs/maf/maf connector... Tired of sending my car to shops and spending cash without solving the issue.. I have done the Ecu relearn, accelerator pedal relearn etc and nothing. I've notice when my engine is cold and I jump in the car and take off it runs fine and perfect. And a minute or two (when engine warms up) it goes back to feeling 50% acceleration even with the pedal down. What do you guys think ?

dboyzalter

iTrader: (3)

Air leak or a hose not connected... Is that tube on your upper plenum plugged? Your codes are upstream and downstream oxygen sensor heater cintrol circuit bank 1 excessive low voltage signal if that helps.

travlee

iTrader: (8)

those codes are for o2 sensors..... ever think of changing them? guess the new generation of owners are too lazy to google

Martinbros

I'll change them out I just didn't think bad O2s would result in this kind of issue...

Martinbros

I'll give it a shot on replacing them. But I seriously didn't think the O2s would cause that issue. I have test pipes so I'm sure the down stream didn't matter.

travlee

iTrader: (8)

Did you even look up the codes to see what they were?

NissanTracker

iTrader: (8)

I had a similar issue without P codes. When i was wide open throttle, it would just limp through the power band. My 03 track sat at the stealership for weeks. They kept telling me there was nothing wrong. Turns out, and hold your breathe... One of my brake lights was going bad. I sh*t you not. The voltage across the bulb is an input to the ecu to determine if you a breaking or not. Changed the bulb and was perfect. One of those things about the Z and its electrical gremlins

travlee

iTrader: (8)

that happens alot when people put the led tails in the de's

Martinbros

Sure did

Martinbros

I have a right brake light that's out holy **** . Ima replace them after work and see what happens after.. I swear if this solves my issue .