SC400 Misfire Diagnosis Help
Thread Starter
Driver
Joined: Jul 2022
Posts: 69
Likes: 10
From: Michigan
SC400 Misfire Diagnosis Help
My 93 sc400 is misfiring. I've got a code 25 and 26 (air fuel lean, air fuel rich respectively) How do i properly diagnose and figure out the problem instead of just throwing parts at it like a lot of people do and recommend to do. The problem occurred overnight! I went to drive it the next morning and it idles like ****. (audio included)
Any help or a video link or anything is greatly appreciated!
Any help or a video link or anything is greatly appreciated!
Lead Lap
Joined: Nov 2019
Posts: 3,694
Likes: 1,102
From: Michigan
Hello,
Are you completely sure that you indeed got Both of those Codes at the Same Time? Those codes are Mutually Exclusive, you can only have either one or the other, like when you are adjusting the volume, you can't have it set to both highest and lowest volume at the same time. Seeing how suddenly this issue appeared, you either misread the CEL Count, or the ECU is starting to loose its marbles, a grim reality of those older Lexus models, here is a thread about it.
Try resetting the Codes by disconnecting the Battery Terminal for a few minutes, then reconnect it and count the CEL Flashes again. If nothing else, you can try taking the ECU apart and taking a look at the Capacitors, shouldn't be too difficult.
Hope this helps and best of luck!
Are you completely sure that you indeed got Both of those Codes at the Same Time? Those codes are Mutually Exclusive, you can only have either one or the other, like when you are adjusting the volume, you can't have it set to both highest and lowest volume at the same time. Seeing how suddenly this issue appeared, you either misread the CEL Count, or the ECU is starting to loose its marbles, a grim reality of those older Lexus models, here is a thread about it.
Try resetting the Codes by disconnecting the Battery Terminal for a few minutes, then reconnect it and count the CEL Flashes again. If nothing else, you can try taking the ECU apart and taking a look at the Capacitors, shouldn't be too difficult.
Hope this helps and best of luck!
Thread Starter
Driver
Joined: Jul 2022
Posts: 69
Likes: 10
From: Michigan
Hello,
Are you completely sure that you indeed got Both of those Codes at the Same Time? Those codes are Mutually Exclusive, you can only have either one or the other, like when you are adjusting the volume, you can't have it set to both highest and lowest volume at the same time. Seeing how suddenly this issue appeared, you either misread the CEL Count, or the ECU is starting to loose its marbles, a grim reality of those older Lexus models, here is a thread about it.
Try resetting the Codes by disconnecting the Battery Terminal for a few minutes, then reconnect it and count the CEL Flashes again. If nothing else, you can try taking the ECU apart and taking a look at the Capacitors, shouldn't be too difficult.
Hope this helps and best of luck!
Are you completely sure that you indeed got Both of those Codes at the Same Time? Those codes are Mutually Exclusive, you can only have either one or the other, like when you are adjusting the volume, you can't have it set to both highest and lowest volume at the same time. Seeing how suddenly this issue appeared, you either misread the CEL Count, or the ECU is starting to loose its marbles, a grim reality of those older Lexus models, here is a thread about it.
Try resetting the Codes by disconnecting the Battery Terminal for a few minutes, then reconnect it and count the CEL Flashes again. If nothing else, you can try taking the ECU apart and taking a look at the Capacitors, shouldn't be too difficult.
Hope this helps and best of luck!
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818_sc4
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