Originally Posted by yauny

I had the same thing happen to me took ecu out on a friday noticed that 2 caps were leaking also this had already been repaired horrible I will say due to someone putting one of them in backwards. Will that do any damage to the ecu? I replaced caps properly and drove the car all day with no issues. Next morning turned it on and back to the old high rough idle and a surge idle bounces from 1300 to 1000 constantly in park and while driving feels like its not getting enough gas bucking sputtering like its missing. Haven't got the CEL check but am assuming its driver side cam sensor cuz that's where all the misses sound like they're coming from. Could the ecu be bad even tho I changed the 2 leaking caps. Also if the green coating is coming off the ecu board is that a bad thing? Thanks for any help

Originally Posted by yauny

I had the same thing happen to me took ecu out on a friday noticed that 2 caps were leaking also this had already been repaired horrible I will say due to someone putting one of them in backwards. Will that do any damage to the ecu? I replaced caps properly and drove the car all day with no issues. Next morning turned it on and back to the old high rough idle and a surge idle bounces from 1300 to 1000 constantly in park and while driving feels like its not getting enough gas bucking sputtering like its missing. Haven't got the CEL check but am assuming its driver side cam sensor cuz that's where all the misses sound like they're coming from. Could the ecu be bad even tho I changed the 2 leaking caps. Also if the green coating is coming off the ecu board is that a bad thing? Thanks for any help

Originally Posted by dogwisper

This is actually a very easy repair. It is located right under the glove compartment.

Just disconnect battery, remove glove compartment under cover(2 clips), pull back carpet to reveal plastic ECU protector, remove the 2 screws that hold the protector in place and there is the ECU. One nut holds the ECU in place once the ECU is removed there is just one bolt on the back of it holding the harness in place.
Quick clean and easy. I've got a 92 SC400 mine went bad a few years ago with 180,000 miles on it symptoms were very hard start, ran pig rich belching black smoke, no idle, thought I lost her. Took it to Lexus to confirm it was the ECU. They said $1,200 plus labor. Originally replaced with a junk yard unit which lasted another year. I had mine rebuilt last year with a lifetime warranty for around $100. It is a cheap fix, this is a critical component that fails and it gives you future piece of mind. These cars are very durable but given that many are over 20 years old even things that don't frequently fail will fail in a car with electronics at this age. I live in Florida so the heat may have played a role. My advice is fix it and no worries down the road. Good Luck. Pat

Originally Posted by BSlexus

So like my 93 sc400 when you start it the cel with flash dimly, it's always ran rich and will not rev past 4500rpms. My best guess would be this compaciter issue, agreed?