Having just removed my upper plenum, this exactly solved the mystery of why there is a fuel line to the centre of the underside. Thanks so much, Kelvin!
11:22 Yes!! I mean, I do!!!!! For sureeee!!!! Nice video mate thanks for the info. When my car warms up it has hesitation with throttle response. No CEL
What would the resistance be of the sensor when it's installed in the engine cold? Engine hasn't run at all and the resistance between points is at 53.5 ohm and between point and ground resistance is at 72.5
can I just unplug the front sensor plug if I think this is malfunctioning? Never gets under 50F/10C here. Getting high HC on smog test, perhaps this is hurting me.
Hey @CartuneNZ I have a problem starting my 1992 LS400. The starter turns the engine, it has fuel and air in it, but f I crank it for about 10 seconds it only starts on 5-10 try. If I spin it for just 1 second, it starts on the second try. What's going on here? I'm running out of ideas
Hi Kelvin, enjoy your videos, really great. My soarer has developed the following issue and l am wondering after watching this video if it could be the injector timer? The engine will start but cuts out within 10 seconds. You have to do the process atleast 4 times and then the engine idles fine. Any ideas as to what it may be. The car is a 1991 UZZ31. Thanks, David
I would be doing the normal diagnoses. Checking the ignition and fueling , checking for air leaks and idle system and looking at ECU possibilities. Cheers Kelvin
Hey Mate, do you have the part numbers for: coolant temp ECU # Thermostat and O ring # cold start temp sender # great video. I am trying to work out why my 1UZ celica has more power when cold then when warm, so i am starting from the top and working down. Cheers Brian
Usually I like a squirter but I got too much squirt in my lube. Is it possible my cold start injector is leaking (maybe the circuit malfunctioned?) or is it most likely my 8 dirty squirters I'm servicing at the moment. She's got a rich personality lately too. 93' SC400
@@68pishta68 they were shot. I was able to replace them and the oil stopped smelling like gasoline. That however was not the main issue it had lol it still ran rich and had almost no power...can't wait to buy another SC!!
Hi Kelvin, Looking at the SC400 wiring diagram for the cold start injector circuit, I have determined that it is impossible for the ECU to fire the cold start injector. The timer switch and cold start injector get their power from the starter relay which is powered only while cranking, and the cold start injector timer switch sits between the injector and ground, to prevent the cold start injector from running when starting the engine when it's already warm. There are two wires which go to the ECU: one continues on directly from the starter relay to tell the ECU the starter is cranking; and the other from the timer switch to tell the ECU if the cold start injector is running. Being that in order for the ECU to fire the cold start injector, power would need to be applied to the start circuit, which would in turn cause the starter to crank, it is impossible for the ECU to run the cold start injector. I wasn't able to find the circuit diagram for the LS400, but having pulled apart the loom it looks like it's wired the same way.
The cold start timer is the trigger for the cold start injector at low temps and the ecu triggers the injector over the temp threshold. The ecu definately is able to trigger the cold start injector on starting.
I seem to have info which you don't have. I have the toyota diagnostic for the cold start circuit. Little bit of logic, its a starting injector, so it only needs to work on starting, its not a running injector so doesn't need to work once the engine is running. It is not linked in with any other injectors, it has its own circuit. I keep other information for my customers which purchase my wiring instructions. Im even happy to provide the advanced sheets if they require them for there own knowledge. Cheers
@@CartuneNZYea, that was the logic that made me question the ECU using the CSI at "other times", as you said in the video. Now that I know you meant while cranking and temp is not below threshold, it makes total sense. A little background... not that you probably care, but... I'm putting an early LS400 engine into a late 2nd gen 4runner, which is getting converted to MT, but the engine came with a cut loom and no ECU, so I've found an SC400 ECU and pigtail... It's definitely the hard way to go, but I like a challenge. STJ is the wire missing from my SC400 diagram. I just need to figure out which pin that is on my ECU. The diagram I have (which is probably from an aftermarket repair manual) shows it looping back to pin 5 of my starter relay, which would have resulted in a short circuit through the cold start timer switch. (Glad I caught that!) It's the last wire I need to figure out, so it's probably not worth buying the instructions. Worst case scenario, I'll leave it out, since the cold start timer will operate the CSI when it's really needed, and that should be 'good enough'. I'd like to make it work 100% proper, but oh well. I would love to know more about how the wiring in the loom differs from the diagram as you mentioned in the video, and the reasoning behind why you wire it according to the diagram for manual transmissions and the unknown way for auto... but I suppose that's probably privileged information too... luckily, I'm mating mine to an MT, so I don't really need to know... I just find it super interesting.
Saludos, entonces, puedo eliminar la conexion o no que va al inyector de arranque en frio del reel y poner el tapon? , puedo eliminar el sistema del inyector de arranque en frio sin tener problemas con la ecu? Lexus ls400 1.992. G1. desde Maracaibo Venezuela.
On the stock ecu we always leave the cold start injector system connected. I show cold start removal on some of my aftermarket ecu videos. Cheers Kelvin
Im thinking you may have removed the hydraulic fan pump running straight from the crank to top idler then I use 6pk1555 or 6pk1560. If the pulley is still present 6pk1590 is a good option.
Hey man love the videos I am located in the Manawatu/ Palmerston North have had a Toyota celsior stock 1uzfe for a fare while and I’m over the automatic gearbox would be able to help me out with getting my hand on full manual conversion ive been tryna buy something for a while but have no idea where to look
I have all the details for doing a manual swap on a celsior. The manual swap is often worth more than the car these days but it does unleash some power. Cheers Kelvin
@@CartuneNZ If that'll work on an SC400 as well, I can envision a future where we do some business together! NOBODY in Canada knows anything about these cars. All the GOOD knowledge and fanbase is down under it seems.
I have a question for you i have a 96 ls400 that randomly loses fuel pressure when i floor it when i lose pressure it revs up but when idol or partial throtle itll almost die and come back to life i know that something controls power to the pump cutting pressure at partial throtle and uping it at full throtle could that resister by the battery be bad or does it sound like an ecu issue if it is the resister could i buypass it and get steady pressure all the time thanks in advance i understand if you dont have time to read and reply but any help is apreaciated
Hello. I prefer not to by pass resistor on stock vehicles. Toyota fitted them for a reason. I would be testing the circuit opening relay, fuel pump relay, resistor, fuel pump outputs from the ecu and fuel pump. With pump current draw is a great test which I like to use. I would expect by testing these items that the issue would be clear. Cheers Kelvin
@@CartuneNZ thank you very much for the reply I was only going to bypass it to rule it out as the issue but I will follow your advice thanks again, your input means allot
Sensei, i have have broken my cold start injector banjo bolt line as it was old and crumbled. Can you guide me to the easiest cheapest solution? I have looked online and can’t seem to find one Cheers Brandon
Hi kelvin. I know im commenting after an year on this video. Im having a problem, my uz runs extremely rich when i cold start it, rough idles, and comes back to normal when its up to its normal temperature or when i start driving it. Could you help me out on this please? Thanks
Have you tested anything? Checked basics like spark plugs, leads, air filter, etc? Connected scanner to check live data? Confirmed efi temp sensor is within spec? Normally this sort of issue is maintenance related?
@@CartuneNZ i have checked the rest, seems fine. I don't have the connections to the scanner bcs ive swapped it into a land rover. It also starts running rich and idling rough when i leave it on idle for about 20-30 seconds. Loses power in gear at that time, goes back to normal after 2k rpms
@@CartuneNZ and i have it running for about 2 years now didn't really have a problem untill this monsoon. This started from just a ticking noise when i turned the key and it wouldn't turn the engine. So i had to jump start it in 2nd gear. It's a manual land rover gear box btw.
Could you explain the major differences between a SC400 and a Soarer? I want to get an exhaust system from Australia but it says it is for a Soarer. Will there be conversion issues?
I can answer this: Soarers came with a variety of engines. The SC400 only came with the 1UZ-FE. The steering is LHD on the SC, and the cluster has traditional dials, whereas the Soarer's is digital. Other than that -- except for a few details -- Soarers and SC400s are the same car.
I have a Lexus ls 400 1uzfe it starts a cut's out ideality does anyone know what that could be? it all So gives 0 Code's got new spark plug's a new coil an it as a new mass airflow sensor fule pump is all So Working :)
Hey Kelvin, another great video. With a standalone you have no choice but to remove it? A video of how you block off the injector hole and a fuel line would be awesome!
It is possible to keep with a standalone ecu if one understands the system however I normally remove which I've showed on in several standalone videos. Takes me a couple of minutes to bash a 3/4 walsh plug into the hole and screw a 8x1 blank into the fuel rail.
@@CartuneNZ what’s the downside to deleting the cold start injector? i bought a 1uz without the fuel rails and i replaced the rails with ones that ended up not having the bolt hole for the banjo fitting to the cold start injector. Trying to figure out what’s the best route to go in my case.
![85 Celica 22RE - Cold Start Injector, ECT, TPS, VAF, IAT Testing [Beau's First Time Driving a Stick]](http://i.ytimg.com/vi/8M7BSRGc-lY/mqdefault.jpg)
Having just removed my upper plenum, this exactly solved the mystery of why there is a fuel line to the centre of the underside. Thanks so much, Kelvin!
Cool as.
11:22 Yes!! I mean, I do!!!!! For sureeee!!!! Nice video mate thanks for the info. When my car warms up it has hesitation with throttle response. No CEL
Back then when the thermo switch was very expensive to buy we took them apart bend the metal contacts and glued together and reused it works real good
ok
What would the resistance be of the sensor when it's installed in the engine cold? Engine hasn't run at all and the resistance between points is at 53.5 ohm and between point and ground resistance is at 72.5
can I just unplug the front sensor plug if I think this is malfunctioning? Never gets under 50F/10C here. Getting high HC on smog test, perhaps this is hurting me.
Hey @CartuneNZ I have a problem starting my 1992 LS400. The starter turns the engine, it has fuel and air in it, but f I crank it for about 10 seconds it only starts on 5-10 try. If I spin it for just 1 second, it starts on the second try. What's going on here? I'm running out of ideas
Hi Kelvin, enjoy your videos, really great. My soarer has developed the following issue and l am wondering after watching this video if it could be the injector timer? The engine will start but cuts out within 10 seconds. You have to do the process atleast 4 times and then the engine idles fine. Any ideas as to what it may be. The car is a 1991 UZZ31.
Thanks,
David
I would be doing the normal diagnoses. Checking the ignition and fueling , checking for air leaks and idle system and looking at ECU possibilities. Cheers Kelvin
Does a 97 ls400 have this ? Coke start injector
Hey do you know what is the flow rate for the cold start injector? cc/min?
Hey Mate, do you have the part numbers for:
coolant temp ECU #
Thermostat and O ring #
cold start temp sender #
great video. I am trying to work out why my 1UZ celica has more power when cold then when warm, so i am starting from the top and working down.
Cheers Brian
Could this circuit affect starting during hot starts too?
My 91 Toyota V6 truck recently has hard starting, cold or hot.
Could do, as it does operate both hot and cold so worth testing it.
Usually I like a squirter but I got too much squirt in my lube. Is it possible my cold start injector is leaking (maybe the circuit malfunctioned?) or is it most likely my 8 dirty squirters I'm servicing at the moment. She's got a rich personality lately too. 93' SC400
me too! How were your injectors?
@@68pishta68 they were shot. I was able to replace them and the oil stopped smelling like gasoline. That however was not the main issue it had lol it still ran rich and had almost no power...can't wait to buy another SC!!
Hi Kelvin,
Looking at the SC400 wiring diagram for the cold start injector circuit, I have determined that it is impossible for the ECU to fire the cold start injector. The timer switch and cold start injector get their power from the starter relay which is powered only while cranking, and the cold start injector timer switch sits between the injector and ground, to prevent the cold start injector from running when starting the engine when it's already warm. There are two wires which go to the ECU: one continues on directly from the starter relay to tell the ECU the starter is cranking; and the other from the timer switch to tell the ECU if the cold start injector is running. Being that in order for the ECU to fire the cold start injector, power would need to be applied to the start circuit, which would in turn cause the starter to crank, it is impossible for the ECU to run the cold start injector. I wasn't able to find the circuit diagram for the LS400, but having pulled apart the loom it looks like it's wired the same way.
The cold start timer is the trigger for the cold start injector at low temps and the ecu triggers the injector over the temp threshold. The ecu definately is able to trigger the cold start injector on starting.
@@CartuneNZ
Ahh, you're saying that the ECU can run the CSI >while cranking
I seem to have info which you don't have. I have the toyota diagnostic for the cold start circuit. Little bit of logic, its a starting injector, so it only needs to work on starting, its not a running injector so doesn't need to work once the engine is running. It is not linked in with any other injectors, it has its own circuit. I keep other information for my customers which purchase my wiring instructions. Im even happy to provide the advanced sheets if they require them for there own knowledge. Cheers
@@CartuneNZYea, that was the logic that made me question the ECU using the CSI at "other times", as you said in the video. Now that I know you meant while cranking and temp is not below threshold, it makes total sense.
A little background... not that you probably care, but... I'm putting an early LS400 engine into a late 2nd gen 4runner, which is getting converted to MT, but the engine came with a cut loom and no ECU, so I've found an SC400 ECU and pigtail... It's definitely the hard way to go, but I like a challenge.
STJ is the wire missing from my SC400 diagram. I just need to figure out which pin that is on my ECU. The diagram I have (which is probably from an aftermarket repair manual) shows it looping back to pin 5 of my starter relay, which would have resulted in a short circuit through the cold start timer switch. (Glad I caught that!) It's the last wire I need to figure out, so it's probably not worth buying the instructions. Worst case scenario, I'll leave it out, since the cold start timer will operate the CSI when it's really needed, and that should be 'good enough'. I'd like to make it work 100% proper, but oh well.
I would love to know more about how the wiring in the loom differs from the diagram as you mentioned in the video, and the reasoning behind why you wire it according to the diagram for manual transmissions and the unknown way for auto... but I suppose that's probably privileged information too... luckily, I'm mating mine to an MT, so I don't really need to know... I just find it super interesting.
Saludos, entonces, puedo eliminar la conexion o no que va al inyector de arranque en frio del reel y poner el tapon? , puedo eliminar el sistema del inyector de arranque en frio sin tener problemas con la ecu? Lexus ls400 1.992. G1. desde Maracaibo Venezuela.
On the stock ecu we always leave the cold start injector system connected. I show cold start removal on some of my aftermarket ecu videos. Cheers Kelvin
I cut between 70 and 80 in the machine, cleaned the stroke, and changed my face and wires
ok.
CartuneNZ
I want a solution
@@عبدالعزيزمحمد-ت7ح sorry I dont understand what you are doing
Hello, required
Engine belt number 1uz is required for a fanless fan motor
Im thinking you may have removed the hydraulic fan pump running straight from the crank to top idler then I use 6pk1555 or 6pk1560. If the pulley is still present 6pk1590 is a good option.
i have a/c deleted and the fan pulley in place. 6pk1615 works for me
@@CartuneNZ Thanks, but I need the number in addition to the air-conditioner, please
Hey man love the videos I am located in the Manawatu/ Palmerston North have had a Toyota celsior stock 1uzfe for a fare while and I’m over the automatic gearbox would be able to help me out with getting my hand on full manual conversion ive been tryna buy something for a while but have no idea where to look
I have all the details for doing a manual swap on a celsior. The manual swap is often worth more than the car these days but it does unleash some power. Cheers Kelvin
@@CartuneNZ If that'll work on an SC400 as well, I can envision a future where we do some business together! NOBODY in Canada knows anything about these cars. All the GOOD knowledge and fanbase is down under it seems.
Yep. If only you guys saw the stuff we were doing 10 years ago. You would have been blown away.
I have a question for you i have a 96 ls400 that randomly loses fuel pressure when i floor it when i lose pressure it revs up but when idol or partial throtle itll almost die and come back to life i know that something controls power to the pump cutting pressure at partial throtle and uping it at full throtle could that resister by the battery be bad or does it sound like an ecu issue if it is the resister could i buypass it and get steady pressure all the time thanks in advance i understand if you dont have time to read and reply but any help is apreaciated
Hello. I prefer not to by pass resistor on stock vehicles. Toyota fitted them for a reason. I would be testing the circuit opening relay, fuel pump relay, resistor, fuel pump outputs from the ecu and fuel pump. With pump current draw is a great test which I like to use. I would expect by testing these items that the issue would be clear. Cheers Kelvin
@@CartuneNZ thank you very much for the reply I was only going to bypass it to rule it out as the issue but I will follow your advice thanks again, your input means allot
Sensei, i have have broken my cold start injector banjo bolt line as it was old and crumbled. Can you guide me to the easiest cheapest solution? I have looked online and can’t seem to find one
Cheers Brandon
Wax on, wax off, wax on, wax off. Haha. Where in the world are you? Either reuse ends and get new hose crimped on or I have spares
@@CartuneNZ im in Minnesota, USA. Its pretty cold here 5 months out of the year. Are there any other vehicles that have similar ones?
Hi kelvin.
I know im commenting after an year on this video.
Im having a problem, my uz runs extremely rich when i cold start it, rough idles, and comes back to normal when its up to its normal temperature or when i start driving it.
Could you help me out on this please? Thanks
Also mine doesn't have a cold start injector i think
Have you tested anything? Checked basics like spark plugs, leads, air filter, etc? Connected scanner to check live data? Confirmed efi temp sensor is within spec? Normally this sort of issue is maintenance related?
@@CartuneNZ i have checked the rest, seems fine. I don't have the connections to the scanner bcs ive swapped it into a land rover.
It also starts running rich and idling rough when i leave it on idle for about 20-30 seconds. Loses power in gear at that time, goes back to normal after 2k rpms
@@CartuneNZ and i have it running for about 2 years now didn't really have a problem untill this monsoon.
This started from just a ticking noise when i turned the key and it wouldn't turn the engine. So i had to jump start it in 2nd gear.
It's a manual land rover gear box btw.
Could you explain the major differences between a SC400 and a Soarer? I want to get an exhaust system from Australia but it says it is for a Soarer. Will there be conversion issues?
steering shaft is on the other side, you might have issues clearing it depending on the brand
LHD and RHD is a big one however lots of parts still interchange. If you use ToyoDiy you can cross reference the differences. cheers Kelvin
I can answer this: Soarers came with a variety of engines. The SC400 only came with the 1UZ-FE. The steering is LHD on the SC, and the cluster has traditional dials, whereas the Soarer's is digital. Other than that -- except for a few details -- Soarers and SC400s are the same car.
What’s up man I have a 1993 sc400 1uz and out of nowhere it won’t start have you had problems like this ?
Sure. Have people bring me cars frequently which dont start. I go though normal diagnostic checks and have them running in no time.
CartuneNZ what would you say are some reasons why mine won’t start ? I have power brand new battery alternator is good
I have a Lexus ls 400 1uzfe it starts a cut's out ideality does anyone know what that could be? it all So gives 0 Code's got new spark plug's a new coil an it as a new mass airflow sensor fule pump is all So Working :)
Time to do more testing. I have a video on one fire and stop situation and show the testing for that fault. Cheers Kelvin
Hey Kelvin, another great video. With a standalone you have no choice but to remove it? A video of how you block off the injector hole and a fuel line would be awesome!
It is possible to keep with a standalone ecu if one understands the system however I normally remove which I've showed on in several standalone videos. Takes me a couple of minutes to bash a 3/4 walsh plug into the hole and screw a 8x1 blank into the fuel rail.
@@CartuneNZ awesome. I'll have a look at the standalone vids as I thought I watched all 😂
on a drift car, my best bet is to probably get rid of it right?
If running stock ecu I prefer to keep it. In drift cars I prefer aftermarket ecu anyway so I remove it.
@@CartuneNZ I'll be going link monsoon so I'll probably delete it then
@@CartuneNZ what’s the downside to deleting the cold start injector? i bought a 1uz without the fuel rails and i replaced the rails with ones that ended up not having the bolt hole for the banjo fitting to the cold start injector. Trying to figure out what’s the best route to go in my case.
(i’m running the stock ecu)
Is there a contact number or a communication account
???
Yes, in both description and credits