running outta solutions.. tried everything. help me please.

[Addicted2Kouki]

The problem is...
the car wont idle and dies out unless i rev the motor.
sometimes it revs smoothly, sometimes its a lil rough.

its acting like a vacuum leak.
but so far i have been unable to find any.
i smell unburnt fuel.

My setup is pretty basic:
KA24DE
GT28R
370cc injectors
N60maf
chipped ecu
HKS BOV
FMIC

i have already:

changed oil and oil filter
replaced valve cover gasket
replaced the spark plugs
replaced injectors seals
ohm tested the injectors
replaced the distributor
removed the air filter (in case it was impeding airflow)
unplugged the maf to see if the maf went out
replaced fuel filter
compression tested the motor
1: 160
2: 160
3: 150
4: 160
checked for coolant in the oil & vice versa
removed bov to check if it was leaking
checked ecu chip and conversion harness for ecu

i hear the fuel pump prime when the ignition is on
and the car starts perfect every time.

i dont know what else to check.

[locoluna825]

sounds just like a vaccum leak. Have you tried taking some starter fluid and spray down the engine with it. when the rpms raise you found the leak.:l101:

[fishboi]

Addicted2Kouki;3568738]The problem is...

KA24DE




Found your problem.

[40cal]

+1 with locoluna

lightly spray brake cleaner on intake pipe and IC hose connections. if there is a leak it will pull in the fluid and the idle will go up. pin holes, cracked vacuum lines, loose hoses, cracked intake pipes will cause it. dont spray it on the air filter, the idle will go up but the cause is obvious.
GL

[sidedrifts13]

tps sensor check that out, and use a colder spark plug atleast 2 steps, also check you fuel pressure

[Addicted2Kouki]

sounds just like a vaccum leak. Have you tried taking some starter fluid and spray down the engine with it. when the rpms raise you found the leak.:l101:

yes, i have.
multiple times.
i forgot to mention that.

KA24DE




Found your problem.

hey fishboi!
you're new here...
ill be nice.

stop trying to be a smartass & go choke on a fish.
you obviously know nothing of importance.

+1 with locoluna

lightly spray brake cleaner on intake pipe and IC hose connections. if there is a leak it will pull in the fluid and the idle will go up. pin holes, cracked vacuum lines, loose hoses, cracked intake pipes will cause it. dont spray it on the air filter, the idle will go up but the cause is obvious.
GL

tried that already.

tps sensor check that out, and use a colder spark plug atleast 2 steps, also check you fuel pressure

ill definitely check the tps sensor.
forgot to look there.

i already use colder spark plugs.
i use NGK BKR7Es gapped to .35

i dont have anything to check my fuel pressure with at the moment,
hopefully i find a gauge or something from one of my friends.

[fliprayzin240sx]

Try gapping the spark plugs down some more... .030. Dont think it would make much difference but you wouldnt know. Anyways, did this setup run before with the chipped ECU? Just making sure its tuned for those 370 and the maf...

[Addicted2Kouki]

Try gapping the spark plugs down some more... .030. Dont think it would make much difference but you wouldnt know. Anyways, did this setup run before with the chipped ECU? Just making sure its tuned for those 370 and the maf...

I've been running the same setup for more than 2 years.
same spark plug gap too.

[g35gabby]

what happens after you car goes into closed loop???

you can always test the system for vac leaks with an air compressor.......

[Tokona-x]

sounds just like a vaccum leak. Have you tried taking some starter fluid and spray down the engine with it. when the rpms raise you found the leak.:l101:

+1 for this method ive personally tried it and works like a charm, Some people like to use WD but thats really messy i like brake cleaner though or thrust.

tps sensor check that out, and use a colder spark plug atleast 2 steps, also check you fuel pressure

Checking TPS and adjusting idle
KA24DE : Checking TPS and adjusting idle : Nissan Articles (http://forums.nicoclub.com/ka24de-checking-tps-and-adjusting-idle-t161700.html)

[Slo_240sx]

what happens after you car goes into closed loop???

you can always test the system for vac leaks with an air compressor.......

I am wondering the same thing. Does it stay running long enough to get hot and go into closed loop? I almost want to suspect a bad coolant temp sensor. Usually when they go bad they'll read -40*F and make the ECU fire rich as hell. Good starting post, you covered everything you did from the get, unlike alot of people on here who just say "my car runs bad".

Did this happen right after you did the preventative maintenance? If you didnt drop the distributor back in correctly it is probably off time. Usually off by 1 tooth. A jumped timing belt could do this as well. Even if you dropped it in right, if you didnt put a timing gun on it to set the timing it will run bad.

First thing I would do is redrop the distributor. Put cyl 1 to top dead center, then drop the dist on cyl 1. I wont insult your intelligence, I am sure you know how to time it.

[sickrbs14]

it could be that vaccum line from the intake manifold i know you have to have it hooked up so your engine idles right

[sidedrifts13]

any updates? hope you figure it out good luck

[dgomez]

sounds a like my current situation but its because my car needs to be retuned, info from my maf and fuel got disconnected from ecu

[GroundPerformance]

try doing a boost leak test by pressuring your charge pipes and listen for leaks somewhere or soapy water helps.. It's also possible your Rom Tuned ECU programming has been lost or daugtherboard not making a good connection try reseating it. Lastly, your running an N60/370cc combo you will be able to run on stock ECU for testing to isolate the ECU issues.

[KrazyS13]

Your car sounds like it is doing the same thing mine was doing(ka24de). My car had one bad injector, which ohm tested fine BTW.

Pressure check your injectors by removing the fuel rail, leaving the injectors installed and plugged in. Then prime the fuel pump and let them sit for a few minutes. If ANY fuel drips whatsoever, its bad. Put some cardboard or paper under the tip of the injectors to notice any leaks.

[Addicted2Kouki]

what happens after you car goes into closed loop???

you can always test the system for vac leaks with an air compressor.......

im gonna try it and see what happens.
last time i checked (yesteday), it just shut up, im guessing from running too rich.

i still want to do that, but i dont have what i need to make that happen.

+1 for this method ive personally tried it and works like a charm, Some people like to use WD but thats really messy i like brake cleaner though or thrust.



Checking TPS and adjusting idle
KA24DE : Checking TPS and adjusting idle : Nissan Articles (http://forums.nicoclub.com/ka24de-checking-tps-and-adjusting-idle-t161700.html)

Thanks for the link.

I am wondering the same thing. Does it stay running long enough to get hot and go into closed loop? I almost want to suspect a bad coolant temp sensor. Usually when they go bad they'll read -40*F and make the ECU fire rich as hell. Good starting post, you covered everything you did from the get, unlike alot of people on here who just say "my car runs bad".

Did this happen right after you did the preventative maintenance? If you didnt drop the distributor back in correctly it is probably off time. Usually off by 1 tooth. A jumped timing belt could do this as well. Even if you dropped it in right, if you didnt put a timing gun on it to set the timing it will run bad.

First thing I would do is redrop the distributor. Put cyl 1 to top dead center, then drop the dist on cyl 1. I wont insult your intelligence, I am sure you know how to time it.

This all happened BEFORE i did any maintenance.
Im gonna recheck the timing sometime this week, whenever my friend brings by a timing gun.

it could be that vaccum line from the intake manifold i know you have to have it hooked up so your engine idles right

you just confused the shit outta me.
what are you talking about?

any updates? hope you figure it out good luck

i hope i figure it out too.

sounds a like my current situation but its because my car needs to be retuned, info from my maf and fuel got disconnected from ecu

disconnected from the ecu?
as in daughterboard or chips came loose?

try doing a boost leak test by pressuring your charge pipes and listen for leaks somewhere or soapy water helps.. It's also possible your Rom Tuned ECU programming has been lost or daugtherboard not making a good connection try reseating it. Lastly, your running an N60/370cc combo you will be able to run on stock ECU for testing to isolate the ECU issues.

Im pretty sure none of my charge pipes are leaking.
Could be a vac leak somewhere on the motor though.. =\

The programming on my chip can be lost?
just checked the connection today, still hasnt changed anything.

Im gonna look for my stock ecu to facilitate any issues relating to my ecu tune.

Thanks for your help everyone.
Im gonna try to check my TPS, CTS (again), recheck timing, and check my ecu.

Hopefully something works and I can finally get this car back on the road.

[Addicted2Kouki]

Your car sounds like it is doing the same thing mine was doing(ka24de). My car had one bad injector, which ohm tested fine BTW.

Pressure check your injectors by removing the fuel rail, leaving the injectors installed and plugged in. Then prime the fuel pump and let them sit for a few minutes. If ANY fuel drips whatsoever, its bad. Put some cardboard or paper under the tip of the injectors to notice any leaks.

Ill give that a try when I have more time.
In addition to everything else I have to try.

It may take awhile to get thru everything because one of my friends just got out of the hospital and I think spending time with a friend is more important than my car.

but, Thank you for your input on my thread.

[playastarkz123]

may wanna check ur fuel filter also, i find a lot of peope on here including myself using the bigger 300zx fuel filters

[Addicted2Kouki]

may wanna check ur fuel filter also, i find a lot of peope on here including myself using the bigger 300zx fuel filters

I have been running my KA-T setup for more than 2 years.
Of course I upgraded my fuel filter to a z32 fuel filter then.
Sorry for the lack of information in my first post.
I just thought it was obvious that I would upgrade to it.

but I also replaced that and the lines associated with it.
So that rules out the possibility of it being my fuel filter.

Today I replaced my s15 fuel pump with a walbro.
Problem was still there.

Updates on the condition.
-Starts up fine.
-Starts to die out and has a low idle.
-The car doesnt really rev freely.
-Backfires when i rev the motor quickly.
It runs rich and I am leaning towards the possibility of a bad injector,
even though the ohm test results were perfect.

[Slo_240sx]

It could also be a bad idle air control motor. Which would act like a vaccum leak but wouldn't show it because its recirculating. Are you still running one? I dont remember exactly how it is on a DE but if it has a leak you can clamp the hose to it or even make a black off plate for testing purposes. My friend with a Turbo DE somehow deleted his and and is now controlled by the ECU.

[xska]

It could be your distributor, if it's back firing. Call Driftspeed if you are in long beach.
They might have extra distributor to test.

[g35gabby]

It could also be a bad idle air control motor. Which would act like a vaccum leak but wouldn't show it because its recirculating. Are you still running one? I dont remember exactly how it is on a DE but if it has a leak you can clamp the hose to it or even make a black off plate for testing purposes. My friend with a Turbo DE somehow deleted his and and is now controlled by the ECU.

you make a block off plate+ set it by all by the thottle pulley.

this too is what I was thinking.

[steve shadows]

You/re in Long Beach?

I am in Long Beach,

SHop is in OC, but I live in LB

I could come take a look at it, just throw me some beer money

[Slo_240sx]

you make a block off plate+ set it by all by the thottle pulley.

this too is what I was thinking.

From the sounds of the syptoms and what he's done so far I'd put it on this. My friend did ^ and fine tuned idle with his EMS.

On the KA there should be a rubber hose coming off of the IAC and 2 electrical plugs. One plug will be for the IAC motor and the other is a position sensor. The big hose will recirculate the air back into the intake tract. Use the vicegrip to clamp down on the big hose, that should tell you if the IAC valve is bad. Also, there is an idle adjuster screw on it, make sure it hasnt backed out or fallen out.

[abunai the drifter]

i would say vac leak dubble check the intake manifold and any where air enters the engine the inter cooler too

[Addicted2Kouki]

it was a bad maf.
it didnt show any signs of it being fucked up
til i found it that day.