Mis-fire/Jerk/Stutter when accelerating from low rpm (in any gear) once engine is up to temp

[luke-z33]

I've had my 350z HR for about 6 months now and while I drive it daily it's always seemed to really struggle in slow moving traffic, when applying light throttle to speed up slightly it seems to jerk/bog down at around 1500-1800 rpm and lurch down to 1200ish before continuing as normal, now I can kind of drive around this (going to 2500/3000 in 1st gear and when I get in to second it's above the rpm range that causes the issue) 

Now this only occurs when hot, on a cold start in a morning the first 5-10 minutes are problem free which leads me to believe this is either an issue with the engine map (I believe it is just the factory tune)/some kind of sensor (I know the crank position sensor can be faulty on there, or maybe a MAF sensor problem)

 

Done a tonne of research into this and found varying reasons this could be occuring such as electrical issues (fixed with a grounding kit), dirty throttle bodies (have had the intake tubes off and the were fine), but as I've said previosly this is only happening when the engine is up to temp.

The only other things I can think of are maybe the spark plugs/coils are struggling to ignite the air/fuel mixture, has anyone else had experience with this problem and managed to find a fix?

 

I'm more than happy to throw a few hundred quid at this but want to make sure I start in the right place.

 

Thanks,

Luke

[Ben350]

I've heard before of people talking about the cars being a bit kangaroo-like, especially at low revs in traffic etc, I think an uprev map is known to fix it somewhat.

 

I definitely remember it from when I first got my car, but whether I've gotten used to it and don't notice it, or my uprev tune fixed it I don't really know.

Read the comments, especially the last one, on this thread -

 

 

[luke-z33]

Hi Ben, 

 

Thanks for this, I'm hopefully getting my exhaust on soon and next step was going to be a remap so hopefully sorts this issue as well, looks like RS Tuning offer the uprev software maps.

 

Nice colour on the motor btw. 

 

Cheers for the reply as well.