cel code 13
Thread Starter
Driver
Joined: Oct 2013
Posts: 84
Likes: 1
From: indiana
cel code 13
on my 93 ls400 i have issues with it missing out sometimes it runs just fine other times rough as crap. Engine light does not stay on and the code i pulled is rpm signal no.2 Is this the cause of it? What should i do to fix this? Tune up was done about 10,000 mi ago need to check distributor caps but wanting to see what the cause of this engine code could be.
Lexus Champion
Joined: Dec 2011
Posts: 4,078
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From: Birmingham, AL
could be an intermittent coil or igniter, also cam position sensor, or failing ECU caps are the most likely 4 things - if you had a code 13 and it ran bad all of the time or not at all, then it is usually timing belt off a tooth.
Thread Starter
Driver
Joined: Oct 2013
Posts: 84
Likes: 1
From: indiana
the car was my sisters fathers car and it didnt get drove very much at all the way it misses out bad at times im surprised its not throwing a misfire code. when its idling you can hear it missing out from the exhaust but like i said sometimes it runs perfectly fine and sometimes like pure crap then it clears up a bit.
Thread Starter
Driver
Joined: Oct 2013
Posts: 84
Likes: 1
From: indiana
well finally had some time to mess with the car, seems to get bad after getting in the gas a little bit or hard, i had the service record pulled from lexus and when they did a tune up they only replace one plug wire and all the plugs. After seeing that i replaced all the wires, both caps and rotors. The passenger side cam sensor wire was rubbed in 2 i fixed the wiring and ohmed out both sensors and they ohmed good. Pulled the ecu and looked for a bulging or leaking capacitor and nothing looked bad at all. About to say screw it and take it to the dealer to diagnose but wondering if there are any other options to try first. I also unplugged one of the coils and tried to start the car and then tried the other one, car will fire but not run just off on coil hooked up.
The caps don't necessarily have to be leaking to be bad. This is Yamae's test for the ECU:
https://www.clublexus.com/forums/ls4...-by-yamae.html
Any other symptoms with the car, like poor MPG, hesitation? Do you know which cylinder/s are misfiring?
https://www.clublexus.com/forums/ls4...-by-yamae.html
Any other symptoms with the car, like poor MPG, hesitation? Do you know which cylinder/s are misfiring?
Thread Starter
Driver
Joined: Oct 2013
Posts: 84
Likes: 1
From: indiana
i seen that test and need to get a good meter to do that, not sure which ones are misfiring. The thing will feel like its running half power sometimes keep jerking and clear up and then take off and other times it may run perfectly fine if you stay out of the pedal. ac and everything works in the car, its just this damn missing out i cant figure out, you can def hear it out the exhaust out the back of the car.
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Thread Starter
Driver
Joined: Oct 2013
Posts: 84
Likes: 1
From: indiana
i have a meter i got the other day, when i get a chance im going to get the codes pulled again and see if anything new has come up that i have not caused, with how bad it runs sometimes im surprised the light isnt on all the time. going to pull the covers off and listen to each injector to see if one isnt clicking like it should be also.
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Thread Starter
Driver
Joined: Oct 2013
Posts: 84
Likes: 1
From: indiana
finally narrowed it down i believe, had my friend rebuild the ecu today reinstalled and still had a miss no better really. I unplugged the air flow meter and drove it and had zero miss to it and no hesitation so im guessing its bad. The question is will i cause any damage by driving it with the afm unplugged until i get another one?
The caps were spec'd from the ECU thread when fixed? Any CEL would store a code so the absence of that leads me to suspect the ECU still may have issues. Does the A/C work? Any shifting issues?
Thread Starter
Driver
Joined: Oct 2013
Posts: 84
Likes: 1
From: indiana
yes the caps are the ones specked on here, the ac works shifting is perfectly fine just a damn miss that i cant get to come back on to pull a code again. when running the ac it does seem like the motor is a little louder then usual like a whining noise if that makes sense.
