1NZ-FE rev issue

[sniper05]

Hi..can I join in this thread.

I am seeking for a person who can help me with my 1NZ-FE 1.5L.
with this forum I am inspired to change my stock engine to 1NZ-FE 1.5L. I further fell in-love with the engine when it starts perfectly with smooth idle speed and sound (can't even hear it running).

the only issue is that when we do sudden (rev or accelerate) the engine in full..it will cut the revolution or acceleration causing a revving sound. but in slow to moderate acceleration the engine run smoothly.

I will be forever grateful to anyone who can help me. Happy new year to all.

[CTScott]

Hi..can I join in this thread.

I am seeking for a person who can help me with my 1NZ-FE 1.5L.
with this forum I am inspired to change my stock engine to 1NZ-FE 1.5L. I further fell in-love with the engine when it starts perfectly with smooth idle speed and sound (can't even hear it running).

the only issue is that when we do sudden (rev or accelerate) the engine in full..it will cut the revolution or acceleration causing a revving sound. but in slow to moderate acceleration the engine run smoothly.

I will be forever grateful to anyone who can help me. Happy new year to all.

It sounds like you are hitting the rev limiter. Do you have a tachometer, and if so, where are the RPMs when it occurs?

[sniper05]

CTScott,

Thanks a lot for your reply..a perfect way to start my 2014.
my stock cluster gauge dont have rpm meter, but on the tacho gauge...its between 20-30 kph at sudden full rev/acceleration.

thanks a lot..I really hope I can solve this issue with your help.

[CTScott]

CTScott,

Thanks a lot for your reply..a perfect way to start my 2014.
my stock cluster gauge dont have rpm meter, but on the tacho gauge...its between 20-30 kph at sudden full rev/acceleration.

thanks a lot..I really hope I can solve this issue with your help.

I would hook up a tachometer or OBD device to see what the RPMs are when it occurs. I really think that you are hitting the rev limit for the engine.

[sniper05]

CTScott
The rpm is around 2.5-3rpm or 3000rpm..then it will cut the engine.
Can help me solve this rev limit?

Thank you.

[sniper05]

Hello CTScott,

Can you help me with my 1nz-fe rev limite..it will cut the engine at 2500 rpm.

Thanks

[CTScott]

Hello CTScott,

Can you help me with my 1nz-fe rev limite..it will cut the engine at 2500 rpm.

Thanks

If it cuts out at 2500 it isn't the rev limiter. There is a slight hesitation around 2500 to 3000 when the VVTI activation begins, but it is not a significant cut out.

Can you post a video of what actually occurs?

[sniper05]

okay, we will connect an after market rpm gauge..and have it run then take a video for you to evaluate. thanks a lot.

[Viperoni]

I believe 2500rpm is where a rev-cut happens if you're throwing a code for something fairly important *AND* for a Check Engine Light circuit issue.

So your CEL might be burned out, and you may be throwing a code for something, and because you wouldn't know that you are throwing a code, the 2500rpm is rev-cut is the only other way the OBD2 system can inform you of an issue.

[sniper05]

Hi all,

thanks for sharing you expertise..high salute to all. we finally figured out what went wrong. our mechanic missed 1 positive wire..this time the engine roars and am totally happy now. though one minor issue occurred in fuel system. I hope CTScott can help me. I did pm him.