Hello i have a 1996 lexus sc400. I’ve been so upset with this car . I bought this car as my first “cool car “ and it ran good for a few months until it started misfiring horribly. I did the spark plugs , checked the coil packs and did the injectors but i’m still misfiring . please help

 

is there any codes coming up or are you just feeling/hearing it? and if you've done all that then I think the popular answer round these parts are 3 dreaded letter "ECU" but I'm just talking outta my....butt as i don't have enough information here.

 

If you turn the car on at night, it would be easier to spot if you have a misfire, because that cat will light up in the dark. This may cause damage to the cat, so I wouldn't do it unless it is absolutely necessary, and you don't know where the misfire is. Check gaps on the spark plugs, and inspect for any foreign debris. Other than that I would check ignitors if it has them. I'm unfamiliar with the newer coil packed ones and am unsure if this is of any help.

 

I have p0115 popping up i used to have the cylinder misfiring code but i cleared the codes and put the injectors in again and the only code that popped up was p0115

 

....A coolant temp sensor fault?..I..I guess did you plug that in or see the condition of it? i think that ones easy to replace very front of the block IIRC

 

yeah i’ve been looking into but the misfire is still there so i guess im gonna go on to the ecu next