kanderson

If your Cat's are bad and I hope they are not. Check online for a company named DEC Catalytic Converters. You might find one or both there for alot less than the factory.

b1ackhawk

Removed cat, what a b****. but looks good, not melted looking at all, i can see light thru to the otherside.
Pulled everything off and double checked the timing marks, everything is Dead on....
I'm really scratching my head now. maybe a coil, i dunno.
Does anyone know how to check a coil?

weird thing is, it runs, just when u hit the gas, it has no power...

Rex Ruthor

How's the primary O2 sensors? Hope you solve the increased EGT issue.

b1ackhawk

i tested the resistance of both coils per FSM procedure. the primary winding on both coils read a fluctuating .8-1.2 ohms, the manual states .4-.5 ohms. Did they both coincidentally go bad to the same degree at the same time? or just an acceptable variance.....

b1ackhawk

problem solved. for future reference, make sure your rotors are orientated correctly. i dont know how on earth i put one of mine on wrong, but i did....

Much thanks to everyone who tried to help me with this

chadr

I know this thread is over a year old... I have the same symptoms on my ls400 after replacing rotors/caps and a whole bunch of other stuff. Sounds like i need to tear it all back down again to have a look at the rotors?

I didn't even believe the rotors could be put on backwards.

Rommel

if it's rough at idle i say it's the wiring. my 400 is very smooth in idle and just one click in the ignition key it starts like new engine but when i rev it to 2000 to 4000 it's rough, cats were changed, tps new, only oxygen sensor left to raplace. don't know what's wrong. need help

chadr

I pulled all plugs and one was oily, reseated the injector connector a few times and sprayed some caig deoxit on it. Car runs like it should again.

I don't think the rotors can be installed backwards in the ls400 from what I remember.