yellowzxtt

I have a mild hesitation problem at wide open throttle between 4500 to 6000 rpm. The car seems to fall flat on its face. Here are the details

2000 I30 auto, 89 k miles

Replaced intank fuel filter
New plugs
New air filter
ECU diagnostics show everthing OK
Y pipe
JWT intake
93 octane all the time

Just a FYI i had the hesitation issue before the mods. Other than that the car is smooth and runs great. I just would like to extract the full potential out of it.


Harry

I30tMikeD

iTrader: (8)

Possbile MAF problem?

PAREDLINE

One of your coils might be misfiring at the higher RPMs.

No check engine light?

yellowzxtt

Infact i did a diagnostic - got no codes. Any ideas ? BTW the car has a distinct retarded feel at 3700 rpm at part throttle. It 3700 everything is smooth and fast - then the car has a retarded feel to 6000 rpm

Harry

greekmax2k1

iTrader: (6)

ok i had the same problem....if i were u go to the dealer and tell them to check your O2 sensor to see if it has good numbers. mine was reading 3 where it was supposed to be 12 or 13....replaced that and fixed the problem right away....

00i30T

Which O2 sensor did you ask them to check and how did you know it was suppose to read 12 rather then 3, just beeing nosy.

Chucky

I30tMikeD

iTrader: (8)

Look into the problem some 5th gen guy have with their Variable Intake Manifold butterfly valves not working. It would cause power to drop drasticaly after 4.5K rpm's or so.

Gerard

your ecu may not have compensated yet for the increase in air from your mods

dr-rjp

iTrader: (4)

Harry:

I just bought a 1998 Infinti I30, and noticed right away how much hesitation it has as compared to my 1992 Maxima. The Max has zero hesitation where the Inifiniti gets it right between 1/3 and 1/2 pedal pressure.

Interestingly, I drove a 2004 G35 while my I30 was in the dealer's shop, and that, too, has hesitation in downshifting -- so much so, that my neck is still sore from the two days I had the car.

It feels like a problem with the throttle and the flow sensors moreso than the ECU. I notice that there is a lot less hesitation when the engine is cold. How about yours?

flthere

iTrader: (2)

yaa .. this hesitation with downshifting is killing ... learnt from 4th gen guys that we need to live with it, along with that idiotic jerky 1st to 2nd gear shifts. the car wouldn't want to change from 3rd of 4th gear into 2nd or 1st even after the speed drops to like 10 or 15 mph.

dr-rjp

iTrader: (4)

Right on, FLTHERE!

Why is it that Nissan can build one of the world's best engines, yet cannot get the tranny to run right? If my only choice is to live with it, then I can say with certainty, that I will not live with it very long.

Right now, my '92 Max is up for sale, but there are moments when I feel like putting the I30 on the auction block instead...especially after shelling out $1,500 to get its tranny rebuilt and it drives better than the "I."

This is one car that could use a Sportshifter like the G35!

attomica

I had the exact same problem...I'd gun it and right around 4500rpm it would bog down. I took it to the stealership for service. I sat there and watched the technician run a diagnostic with a Consult device. Not a single indicator of what the problem was. So they took it in for the day and it turned out to be the MAF. Wanted to shank me $500 to fix it, but I declined and went and bought the part from a Nissan stealership, installed it myself, and saved $300. So, the moral of this story is that there may still be a problem despite thet absence of a diagnostic code. I'd say look at the MAF as the cause of your problem.

Samzx12

Mine is experiencing the same thing (loss of power or jerky acceleration) and the dealer told me what Mike said or cleaning the throttle intakes I believe is what he said. Service guy said this is common with alot of Infiniti's.

Sam

00i30T

Is cleaning the throttle intake an easy job, and how do you know if its dirty?

NewLoveI30

Cleaning the throttle body is very easy. I just unbolted the intake track upto the throttle. Then take throttle body cleaner on a rag and start wiping out the inside. You can just spray the stuff in when the butterfly is closed, but I used the rag when I opened it (dont like spraying stuff into my engine).

While I was at it i cleaned the MAF with something called CRC Contact Cleaner.

BTW, you'll know its dirty when you look at your new black rag (which used to be white)

NewLoveI30

Dirty Throttle:

thephatOne

contact cleaner is cool! always used it for computers

00i30T

Contact cleaner the same as the intake cleaning stuff, I think I have a can of that at home but never used it.

Chucky.

NewLoveI30

I used TB cleaner for the throttle body (go fig.), and used the contact cleaner on the MAF since it is a sensor.

nguyendot

It's probably the same problem with my 01t that I had before. They have a TSB on a tranny solenoid that makes the transmission hesitate from 4 to 6krpm and it looks like its dropping rpms for a sec. Took it to the dealership under warranty and they replaced the solenoid and did transmission service under warranty. Fixed it right up, no more hesitation, and shifts are firm.

flthere

iTrader: (2)

I don't know if this is correct or not, but recently my car gave the O2 sensor code so the front one is apparently gone. Within two days after the code, I observed the car was pulling stronger, and that idiotic downshifting wasn't as bad as it was. I could kiss-n-go near the stop board and the car nicely picked up the speed and acceleration. Now the SES light is gone though after one week, I'm expecting it to come back anytime

Can this be true ?!? ya !?!

Wish Nissan does some good research to come with VQ equivalent auto tx

PAREDLINE

A bad O2 sensor will make your car run rich. Your air fuel ratio will be more towards the fuel side. Thats what the 02 sensor regulates.

Your fuel economy will suck, but you might feel a little performance boost. I wouldnt do this too long because carbon is depositing in your motor as we speak.

budget_hobbies87

Clogged EGR