I have a 1997 lexus ls400, one night it went into limp mode, and it tends to shake pretty bad when u press the gas pedal. I changed the spark plugs, ignition wires, the 2 coils, and both the distributors were in pieces so I changed those with the caps too. But it didn’t help much, but something I noticed is when I unplug the wires from the distributor cap on the passenger side the car still turns on and acts the same, but if I unplug any wire from the other side, it won’t turn on, I’ve also replaced the ecu with new rebuilt one, didn’t help, any advice would be appreciated

 

I think this is a continuation of your last thread:
https://www.clublexus.com/forums/ls-...limp-mode.html

First, are you getting any codes?

It sounds like you have an ignition issue on one half of the engine. You have to test your igniters next to make sure that they're receiving a signal from the ECU and that they're telling the coil to fire

If you don't have the ability to test them, you can also try swapping your two igniters, and then checking if spark moves to the other half of the engine.

- If the engine starts firing from the other side of the engine, then it's likely your igniter is bad and needs to be replaced.

- If nothing changes, you may have a wiring or ECU problem (although your ECU is rebuilt now..)