My 92 sc400 starts and shuts rite off
04-30-13, 11:25 PM
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My 92 sc400 starts and shuts rite off
So I ran into this problem couple days ago that my trac light and engine light is on nothing was wrong starts and drive regular then it started to act up at cold start it would shut off I would have too rev the car up to like 2500 for like couple sec and then let go it would idle fine now I went to start it today and it started then shut off kept trying and no luck if I was to keep my foot on the gas it would stay on but it won't idle😢😢 can someone please help
05-01-13, 10:23 PM
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Ok so I did the paper clip thing to check the codes and one came up which was 24 iat sensor..how do I go bout fixing that can it be cleaned ??
Last edited by Markysc4; 05-01-13 at 10:29 PM.
05-02-13, 07:00 AM
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Yes you can clean it and it will help but that's not your problem.
https://www.clublexus.com/forums/per...rol-valve.html
Do the fuel ecu mod.
https://www.clublexus.com/forums/per...p-12v-mod.html
Don't let taking the back seat out bother you. It is very easy and also will give you a chance to clean up back there and really clean and condition the leather on your back seat while they are out of the car.
https://www.clublexus.com/forums/per...rol-valve.html
Do the fuel ecu mod.
https://www.clublexus.com/forums/per...p-12v-mod.html
Don't let taking the back seat out bother you. It is very easy and also will give you a chance to clean up back there and really clean and condition the leather on your back seat while they are out of the car.
Last edited by Bankswood; 05-02-13 at 07:07 AM.
05-02-13, 08:21 AM
#7
Here is a more picture-orientated DIY on cleaning the IACV. https://www.clublexus.com/forums/per...acv-sc400.html
Make sure to report back after performing the 12v mod.
Make sure to report back after performing the 12v mod.
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05-02-13, 08:53 AM
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Here is a more picture-orientated DIY on cleaning the IACV. https://www.clublexus.com/forums/per...acv-sc400.html
Make sure to report back after performing the 12v mod.
Make sure to report back after performing the 12v mod.
05-02-13, 09:36 AM
#9
No, you're thinking of the Mass air flow sensor, which is placed before the throttle body, as the IACV is allocated into the throttle body.
Your SC is a 92, thus, it has an AFM, which is essentially, an MAF except for the fact that the AFM uses Karmen Vortex air meter to detect air flow and mixture. The AFM cannot be cleaned by merely spraying it with MAF cleaner. This will ruin the AFM, the only procedure you can have done is to blow the AFM wire with compressed air. If the code says to compensate the AFM, than that's expediently a good approximation...or attempt to blow dust off of it.
GL...
Your SC is a 92, thus, it has an AFM, which is essentially, an MAF except for the fact that the AFM uses Karmen Vortex air meter to detect air flow and mixture. The AFM cannot be cleaned by merely spraying it with MAF cleaner. This will ruin the AFM, the only procedure you can have done is to blow the AFM wire with compressed air. If the code says to compensate the AFM, than that's expediently a good approximation...or attempt to blow dust off of it.
GL...
Last edited by SC400slide; 05-02-13 at 09:46 AM.
05-02-13, 12:07 PM
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No, you're thinking of the Mass air flow sensor, which is placed before the throttle body, as the IACV is allocated into the throttle body.
Your SC is a 92, thus, it has an AFM, which is essentially, an MAF except for the fact that the AFM uses Karmen Vortex air meter to detect air flow and mixture. The AFM cannot be cleaned by merely spraying it with MAF cleaner. This will ruin the AFM, the only procedure you can have done is to blow the AFM wire with compressed air. If the code says to compensate the AFM, than that's expediently a good approximation...or attempt to blow dust off of it.
GL...
Your SC is a 92, thus, it has an AFM, which is essentially, an MAF except for the fact that the AFM uses Karmen Vortex air meter to detect air flow and mixture. The AFM cannot be cleaned by merely spraying it with MAF cleaner. This will ruin the AFM, the only procedure you can have done is to blow the AFM wire with compressed air. If the code says to compensate the AFM, than that's expediently a good approximation...or attempt to blow dust off of it.
GL...
05-02-13, 01:11 PM
#12
I don't think the fuel pump mod is going to do much for you.
so the engine light blinked out a 24 or the trac light, the trac light has its own codes you may want to write that one down too and let us know.
Could be the maf, could be the idle valve, could be a bad coilpack of the top of my head.
sounds more like the idle valve though, but the code is for the intake sensor its part of the maf. reset your codes and see if it come back sometimes it will just happen when you have other issues.
You can try cleaning the iacv like in that guide, but just do the cleaning of the tip and make sure the plunger can spin, basically the cleaning in the first 3 pictures. Don't take the black plastic part off the plunger like in the pictures after that, in my iacv adventures that would seem to make mine fail more often than not, and you really don't need to clean in there no carbon goes in there and its all magnets and grease, more likely to break it than do any good. if its still not working you may need a new one.
so the engine light blinked out a 24 or the trac light, the trac light has its own codes you may want to write that one down too and let us know.
Could be the maf, could be the idle valve, could be a bad coilpack of the top of my head.
sounds more like the idle valve though, but the code is for the intake sensor its part of the maf. reset your codes and see if it come back sometimes it will just happen when you have other issues.
You can try cleaning the iacv like in that guide, but just do the cleaning of the tip and make sure the plunger can spin, basically the cleaning in the first 3 pictures. Don't take the black plastic part off the plunger like in the pictures after that, in my iacv adventures that would seem to make mine fail more often than not, and you really don't need to clean in there no carbon goes in there and its all magnets and grease, more likely to break it than do any good. if its still not working you may need a new one.
05-02-13, 01:21 PM
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Regardless of whether you buy a used IAC valve or just clean your present one you are going to need to pull it off so just pull it off and clean it good like Slide recommends. Mine was filthy so I cleaned it. Still had to do the Fuel pump ecu mod.
05-02-13, 04:28 PM
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Yea it gave me code 24 but the mechanic said that the intake air temp won't stop it from idling he checked the idle control vavle and he said it not working
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