97 kouki. ka-t Stalling

[NJ3ndri]

hey guys im kinda stumped here with this car. but first let me be brief about what i have in here.
walbro 255
550 injectors.
tune
gtir t28
greddy turbo timer

Anyway.

car will turn on and idle for about 7 minutes when first started then will stall (without removing or turning ignition off) will try to start again but all it does is crank. (turned off ignition removed key and tried to start again. same thing happens just cranks). removed key and waited about a minute and tried again. (car starts then stalls about 15seconds later) tried the same thing and waiting it out without turning ignition off but car wont start .
seems like something is over heating and wont let engine turn on untill key is in the off position and (component causing no start) is cooled down. eventually car will start but stall shortly after....kinda lost here.
I ordered another walbro 255 since i wanted to replace it anyway

all this is occurring in driveway.
It has hapened while i was driving almost feels like ignition cut off .
heres a youtube link with a short video
97 240sx stalling - YouTube (http://www.youtube.com/watch?v=q-_ZXFYT6MY&feature=youtu.be)


This issue has been resolved. a (engine coolant temperature)ECT sensor was replaced. (the 2pin connector one feeding the pcm) car no longer stalls and is running like a champ
thanks for the help guys

[KiLLeR2001]

coolant temperature sensor.

[s13panic]

^^^
That would be my guess.

[NJ3ndri]

coolant temperature sensor.


as in wrong reading? not sure how that would cause it to stall. i remember on my 95 vq35 swapped maxima the wire broke and i lost reading and thats about it. no drivability issues tho.
but this is not a max so maybe

[NJ3ndri]

coolant temperature sensor.

gave it a little thought about that.
even though gauge is a 25% your saying pcm is seeing overheating and going into safe mode and cutting the car off? ...or something along those lines?

[s13panic]

On most cars theres 2 cts. One sends the signal to the gauge and the other sends a signal to ecu to adjust a/f ratio and such for faster warm ups and all. If cts to ecu is the bad one it can over/under fuel and cause stalling and no restart until temp settles back down to where it gets an accurate reading again.

[NJ3ndri]

On most cars theres 2 cts. One sends the signal to the gauge and the other sends a signal to ecu to adjust a/f ratio and such for faster warm ups and all. If cts to ecu is the bad one it can over/under fuel and cause stalling and no restart until temp settles back down to where it gets an accurate reading again.


ahh ill look at some diagrams and see where this other sensor is located and where its feeding the ecu. im guessing this is most likely a sensor if its is infact the reasoning. i just dont see an open or a short. even a pcm causing that

[s13panic]

Yea pretty common for the sensor itself to fail over time on 240s. Prob not wiring or anything. Prob just the sensor itself.

[NJ3ndri]

Yea pretty common for the sensor itself to fail over time on 240s. Prob not wiring or anything. Prob just the sensor itself.

yea. well thanks for the tip man, ill check it out sometime early tomorrow morning and ill post when i can come up with anything

[brizanden]

have you take the distrib out lately? timing ccould be way off

[brizanden]

nm just listened to the video. change your fuel filter? sounds stupid but ive seen it stall out cars similar to that when they had real dirty filters.

[NJ3ndri]

have you take the distrib out lately? timing ccould be way off

no i havent. car idles fine. this happened a couple of days ago and it came back today and now its just constantly turning off. (it is a heat issue considering key has to be off and letting the component shut down giving it time to relax) so that ect makes pretty good sense. i originaly thought it was the pump because you can hear it going on and off when the key is cycled from on to off. either way ill be changing the pump soon

[NJ3ndri]

nm just listened to the video. change your fuel filter? sounds stupid but ive seen it stall out cars similar to that when they had real dirty filters.

i do have a new filter , ill be installing that tomorrow also

[NJ3ndri]

also thought of a sticking relay for the pump or pcm possibly. i havent checked the diagram on that yet though. i noticed the pump relay is in a retarded spot next to my feet. you cant really just pull it out easily

[brizanden]

ahhh distrib still might need changed the ingnitor when it goes bad can die like that but when its cool it will work for a second. said it sounded like ignitin right?

[NJ3ndri]

ahhh distrib still might need changed the ingnitor when it goes bad can die like that but when its cool it will work for a second. said it sounded like ignitin right?

yea felt like an ignition cut. ill take the cap off and check the obvious. (i hate distributors with a passion)

[NJ3ndri]

Yea pretty common for the sensor itself to fail over time on 240s. Prob not wiring or anything. Prob just the sensor itself.

im looking at alldata and all i see is the sensor near the throttle in front of the motor sort of. that would be the same sensor im assuming? i dont see any other one

[s13panic]

Yea thats the one. 35856

[s13panic]

Yea that image is for a 91 and yea i had to rob the image from google but you get the jist. If thats your problem thats the one.

[GroundPerformance]

Just curious what tune setup are you running?

[NJ3ndri]

Yea that image is for a 91 and yea i had to rob the image from google but you get the jist. If thats your problem thats the one.

yea its got the 2 wires for pcm

[NJ3ndri]

Just curious what tune setup are you running?

honestly cant remember off the top of my head as i just recently got this car as a straight up trade for my 95 vq35 swapped maxima. im still in the process of remembering whats in here. ill let you know as soon as i can can think of the name lol.

[GroundPerformance]

Highly doubt its the CTS. Faulty CTS will not cause you car to not idle properly when cold. If anything a faulty CTS will have the car running OK on Cold and its when it goes to normal operating temp is where it will start to make your car bog down. CTS role is send the signal to the ECU to tell it to switch between cold and hot maps. I'm still leaning as to what kind of tuning are you running.

[GroundPerformance]

honestly cant remember off the top of my head as i just recently got this car as a straight up trade for my 95 vq35 swapped maxima. im still in the process of remembering whats in here. ill let you know as soon as i can can think of the name lol.

I would dig in figuring out what tuning setup are you running. Since this is a 97 OBD2 240sx. Below is usually I would run for KA-T setups.

Option 1 - S13 ECU Conversion / Conversion harness.

Option 2 - S14 OBD1 ECU / Nistune Type 4 board and some ECU repinning. ( JWT also rom tunes this ECU )

Option 3 - For a very basic KA-T setup AFC Piggyback setup.

[s13panic]

Highly doubt its the CTS. Faulty CTS will not cause you car to not idle properly when cold. If anything a faulty CTS will have the car running OK on Cold and its when it goes to normal operating temp is where it will start to make your car bog down. CTS role is send the signal to the ECU to tell it to switch between cold and hot maps. I'm still leaning as to what kind of tuning are you running.

He said it runs for 7 minutes till it warms up then boggs if u read the original post.

[NJ3ndri]

I would dig in figuring out what tuning setup are you running. Since this is a 97 OBD2 240sx. Below is usually I would run for KA-T setups.

Option 1 - S13 ECU Conversion / Conversion harness.

Option 2 - S14 OBD1 ECU / Nistune Type 4 board and some ECU repinning. ( JWT also rom tunes this ECU )

Option 3 - For a very basic KA-T setup AFC Piggyback setup.




i would think option 1. the pcm has some kind of harness adapter to it. my obd connector desnt communicate with it if that helps.

[NJ3ndri]

I would dig in figuring out what tuning setup are you running. Since this is a 97 OBD2 240sx. Below is usually I would run for KA-T setups.

Option 1 - S13 ECU Conversion / Conversion harness.

Option 2 - S14 OBD1 ECU / Nistune Type 4 board and some ECU repinning. ( JWT also rom tunes this ECU )

Option 3 - For a very basic KA-T setup AFC Piggyback setup.



the tune seems as an adaptive type. i disconnected the battery a while ago and it was a choppy idle when started up after battery was disconnected but eventually got back on its feet to idling just fine.

[GroundPerformance]

the tune seems as an adaptive type. i disconnected the battery a while ago and it was a choppy idle when started up after battery was disconnected but eventually got back on its feet to idling just fine.

It's not that. When battery is disconnected your ECU will reset and not know anything. When your start it it will be rough and start reading sensor and its values. The moment it pick up something is off it will throw a CEL and most likely shut your car to protect it. It will continue till this is corrected or otherwise reset again.

[NJ3ndri]

It's not that. When battery is disconnected your ECU will reset and not know anything. When your start it it will be rough and start reading sensor and its values. The moment it pick up something is off it will throw a CEL and most likely shut your car to protect it. It will continue till this is corrected or otherwise reset again.

i understand what youre saying but my issue is the whole key off waiting game i gotta play with it like something needs to cool down. if i go trying to start it up right away after it dies itll just keep cranking.
cold starts isnt an issue at all. thats when it stays running the longest. then eventually turns off and its a shit show after that

[GroundPerformance]

I think the best thing you can do for now is figure out your whole KA-T setup. It will help you narrow down your issues.

[NJ3ndri]

I think the best thing you can do for now is figure out your whole KA-T setup. It will help you narrow down your issues.

thats the goal lol

[NJ3ndri]

im going to try that sensor anyway seeing as its only $25.

[GroundPerformance]

thats the goal lol

List what you have and start checking all of them. Somehow I feel the issue could be on the ECU and or Conversion harness if thats what youre running.

[NJ3ndri]

List what you have and start checking all of them. Somehow I feel the issue could be on the ECU and or Conversion harness if thats what youre running.

ive tried the wiggle test near the ecu. so im starting to highly doubt wiring

[NJ3ndri]

i replaced the ect sensor. the 2 pin one. car is running fine so far. idling for 20+ minutes

[s13panic]

Good news! Keep us updated if anything changes.

[NJ3ndri]

drove the car around beat on it a little let it idle and no signs of problem....i think we have a winner. ECT it is