lexus32508

Hey guys my name is Mike I am new to this forum and I own a 2001 Lexus IS300 that I purchased 3 years ago. I am from the my.is forum and I heard about this forum so here I am. Anyways I had issues with my vehicle lately for the past month. My car has been running rough at low 2rpms and it occasionaly dies on me. This usually happens when my car is warmed up and I drive it for 10-20 minutes. My CEL came up and I had it checked a few times. The first time I got a p1346, p1349 so I checked the OCV and it seemed to be working fine so I reset the light. Next time I got the light I had it checked I gotta p1349 and p0300 and all cylinder misfire codes. So i changed the spark plugs cleaned the wells cleaned the coil packs.

I finish the job and a couple days later I get the cylinder misfire codes again. I drive the car for awhile with the codes on at speeds of 55 mph plus the car seems to lose power So I redo my plugs see if everything is fine and I thoroughly cleaned the wires and the wells. On top of this I changed the pcv valve and seafomed the car through the vacuum lines. The car runs better and it has more power so I figured problem solved but the CEL codes pop up again.

This time I get p1349, p0130, p0150 for the o2 sensors and p0300, p0301, p0303. p0304, p0305 and 0306. I recheck the OCV and test again. I applied battery power to the OCV and the car stalls which from what Ive been told at the my.is forum it indicates the OCV checks out fine. On top of all of this my thermostat gauge is not operating correctly. When Im stopped and the car is idling the thermostat is in the middle but when I drive the car the thermostat gauge goes down.

any ideas? thanks

infojunky

FNG here, I just bought a 2001 with the same codes. From what I have read, the OCV needs to be changed. Mine should arrive tommorow, I'll post up the results.

infojunky

15 minutes, new valve, codes gone and it runs great!!!!!!!!!!!

Franktank

Hey, first time forum user, sorry to reopen an old article. I have read on other forums to clean the OCV filter and change OCV, but some people have said it only fixed it for a little while. What was your case? I have a very rough idle after it has warmed up, check engine light and traction control. I want to say it goes into limp mode once it has warmed up

hzaidi26

Run the codes Franktank. Had the same symptoms and it was the OCV. Had to replace but always good to check what the car is saying

nellyvant

Ok I've lpg running on my 2005 lexus is 300 le auto. All was good for an year or two until it started throwing up random faults all over the place... I'v replaced the ht hardware, plugs (double platinum) new leads and performance coils, refitted gas system tried second ecu on the gas side checked ocv and cleaned it, at the moment she misses only on the front three, a lot when idling, and then under load at lower rpms load seems to have a lot to do with it, if I back probe the ocv what readings should I be looking at?
Runs lovely on unleaded, there's a very slight miss/unevenness at idle and sometimes a small hesitation when I blip the throttle from idle. I'm guessing that this will get worse soon as running on gas the engine is more sensitive to timing issues...
I really hope you can shed a little light on this for me.
Thanks