Z-bra1

Ok people I need help.
I have a 2007 350z bone stock.
I have owned the car for 2 years
It has always had one issue I cant seem to figure out.
I have gone completely through the engine.
The issue is only when the engine is at temperature and you put up to a light and stop then try to go there is a slight dead stop in the accelerator. And when you are traveling at very low speed you can feel a very slight surge or lose of power so slight anyone else probably wouldn't notice.
I have replace the accelerator injectors spark plugs deleted the cats.and I have no engine codes at all.
The car is fine when you are accelerating.
Surely someone has had this problem.

dkmura

iTrader: (64)

Welcome- with the mods listed, it sounds like you need a tune. Paying an experienced turner using something like UpRev's Osiris system is the most likely solution. Expect to pay for dyno time with multiple pulls for the best results. It'll also provide a dyno record so you can see any hesitation or loss of power in graphic form.

Z-bra1

Modded? No it is stock and there must be a cure for this issue without driving 400miles.
Or of all you vq35hr in the us someone must have had the same issue.

dkmura

iTrader: (64)

You say there are NO mods, but the first post says you deleted both catalytic converters? Swapped out injectors? What brand and model spark plugs did you go with?

As for experience with the VQ35HR, I've been racing the Z with one for a decade. Never noticed a dead spot in the power curve, or any slight hesitation in door-to-door competition, unless there was a component failure.

Z-bra1

The exact spark plugs for the vqhr from Nissan
And this problem has been there before every thing I have changed. Also when cold its perfect it only acts strange when its warm and has driven 20 or so miles I'm thinking now the fuel pump is going bad. It is the original

dkmura

iTrader: (64)

Before you start throwing any more parts at your car, I'd suggest checking the diagnostic system for any codes held in memory. For a problem like you describe, it may not result in a CEL, but may throw a drivability code that remains hidden until it gets worse. Otherwise, you're just guessing and replacing parts that aren't otherwise going bad.

coletrickle74

iTrader: (1)

I know you said you removed the cats after you noticed the problem. But that probably only added to the problem. Mine did not run 100% right until I got it tuned. I had some idle and throttle issues.

So if you fix the problem, you might not know it since the new issue is caused by the cats being removed.

How many miles does she have?

Z-bra1

113k miles I'll try to find someone that can do the tune. But in south Louisiana that will be difficult.

dkmura

iTrader: (64)

Might want to try this resource:

https://www.uprev.com/secure/dealer-tuner