Stock KA24DE hesitation/idle problem

[2-4-0]

I've seen a few threads about this but nobody has posted back with what solved the issue.

Its a stock 93' 240. In the past 2 weeks I've noticed a slight hesitation under light throttle from 2500rpm-3000rpm.

Today it started to die @ stop lights (not every one just some).

Recently it has had new:

Plugs, wires, cap and rotor
Fuel Pump
Clutch
Fuel Filter
#4 injector

Kinda stuck on what it could be.

Any help is great.

Thanks guys!

[Touge180]

Sounds like a dirty MAF to me.

[StevenMFQiu]

idle air control valve.

[xxoreolovexx]

IAC or vacuum leak somewhere

[J~TIN]

Vaccuum leak

[2-4-0]

update: Went through the car yesterday and had a look @ a few things. Im going to pull the intake off next weekend and clean the EGR and IACV. I sprayed a entire can of Intake Cleaner through the tube that goes to the IACV and the problem has seemed to have been fixed for now.

[mhalez]

I have a 91 ka24de 240 that had a very similar issue. i replaced injectors plugs wires iacv checked for leaks freaking everything, i ended up making 4 custom grounds using 4 gauge hi temp copper wire with eyelet adapters. cost roughly 30 bucks to do it and solved my hesitation between 3500-4000 as well as my idle stumble while pulling up to a stop light.

there is a diy yourself section on nicoclub, just type in "240sx diy grounding kit" into google its the first result, shows you with pictures exactly what you wanna do.

One suggestion, do NOT make any wires go to the firewall, you will hear a loud valve ticking in the interior. basically make a ground on every corner of the top of the engine nearest the sensors. i did one near the distributor, one near the factory ground on the driver's side, one on a plenum bolt, and one on my throttle body.

[iamtheyi]

^ lol I did that. Cleared it up only to 4k though. Idle still "farts" on idle and past 4k in all gears

[mhalez]

first thing i would do is unplug your o2 sensor and see what happens. it will enter failsafe and if it runs better get a new o2, but i doubt thats it. replace your spark plugs and gap them properly and see what happens. find someone with a similar year maf and swap it out to see what happens, more than likely maf! last few things to check would be vacuum leak, injectors, then finally tps.

[iamtheyi]

update: Went through the car yesterday and had a look @ a few things. Im going to pull the intake off next weekend and clean the EGR and IACV. I sprayed a entire can of Intake Cleaner through the tube that goes to the IACV and the problem has seemed to have been fixed for now.

can you take a picture of where that spot is on the Intake Manifold? I think I'm going to try that this weekend. This bogging thing is pissing me off. I can't even launch cause all it does is fart through its