Originally Posted by JAB

Alternator and/or battery may be dying.

Originally Posted by carguy07

Post the codes you are getting. Are you replacing with OE/Denso parts or aftermarket?

Originally Posted by cotis

How did you "check the oil control valve"? Mine had these same symptoms even though the valves seemed OK when I checked them. Replaced them anyway (along with the OCV filters) and problem solved.

Originally Posted by PeglegGold

I will try these fixes, I will let you know if it works and thanks!

Originally Posted by cotis

How did you "check the oil control valve"? Mine had these same symptoms even though the valves seemed OK when I checked them. Replaced them anyway (along with the OCV filters) and problem solved.

Originally Posted by PeglegGold

Did you use OEM parts? Or Parts store parts?

Originally Posted by M45owner

Thanks for the replies....we dropped it off at the dealer AGAIN Monday morning. They said they would call us later that day or "tomorrow" (Tuesday) with what is wrong. Well, they called today saying they were STILL working on trying to figure out the problem. 3 days and the Lexus dealership doesn't even know what is going on!?

The transmission went out roughly 350 miles after we got the car...had it replaced AT LEXUS. Did the timing belt and water pump job at the same time. No other issues until 2 weeks ago when we got a misfire on 2 cylinders...I believe it was 1 and 3. Moved the "bad" coils to the front of the motor and changed all spark plugs with NGK Iridium plugs. I never use the Bosch or any other garbage in my cars.

Now cylinders 2 and 4 were showing the bad coils, which is where I put them. Put in new coils and it didn't throw any codes and drove like a top until Tuesday (we finished the work on a Saturday)...so 3 days it drove fine. Tuesday we started experiencing the misfire again except it was on EVERY cylinder EXCEPT cylinder 1. Drove like absolute ****.

Took it to a local shop, they didn't know...took it to Lexus, they didn't know. Told me "it has to get worse so we can find out the issue". Well, it never got better and it still misfired even more afterwards. So we just dropped it off again this past Monday morning.

Codes are P1305, P1310, P1315, P1320, P1325....all "igniter circuit malfunction" for cylinders 2-6. No other codes present.

Originally Posted by rapaulino

Thanks for all of the post regarding this issue. My RX-300 2002 started showing this problem on cylinders 1, 3, and 5! I never sow it on the other cylinders. It looks like no even the dealer can determine what is causing this. I am an electrical engineer by trade and the only thing that might be causing this problem could be the spark plug cables. It is possible that with time, the integrity of the cable insulation mitght be breaking down and it is causing some of the high voltage on these cable to be leaking. I will go ahead in my case and replace the spark plug cable before changing any of the coils that do not seem to be correcting the problem. I replaced all of the spark plugs and that did not fix the problem.

Originally Posted by poorerobin

I know this is a belated comment, but with our 2000LexusRX300 we replaced all ignition coils, first one, then another, then several at a time. Problem solved. Next, we were advised to replace the spark plugs. Did so with OEM. Haven't had a problem since. Costly, but the fix seems to have held. That was several years ago now...

I have another question: We have a CEL and have been told to replace the knock sensor harness. Meanwhile, when accelerating from a dead stop the car is intermittently unresponsive. Pushing the accelerator and it's almost as though it was in Park, not Drive. Are these related? (no diminishment of power when accelerating on the highway or at speed, low or high) Really unsure what's causing the latter symptom... thanks for any insights