My 02 IS300 with 53k miles and SRT Intake & ECU is having issues.
My CEL has come on 2 times in the past 600 miles. The first time it came on I noticed I was getting really bad gas milage (~17, usual 22mpg).
I reset the ECU, and I *felt* as if my milege was back to normal (looking back im not too sure, I was doing a lot more highway miles than usual). I also noticed an odd, not too loud popping noise coming from the top of the engine that corresponds to rpm that begins after the car is on a minute or so. Sounds like its coming from a single cylinder, but i dont know much about these things.
It came on again 300 miles later (along with the bad milage and i noticed the popping), and I got it checked at autozone, and the codes are as follows:
DTC PENDING CODES:
Vent Circuit Malf
Search is down, so I did the my.is google search and found a great post by Grey Rider:
Originally Posted by Gray Rider
P0440 (evap emission control sys malfunction). Troubled areas:
Hose cracked, holed, damage or loose seal.
Fuel tank cap not installed properly, cracked or damage.
Vac hose cracked, holed, blocked, damage or disconnected.
Fuel tank cracked, holed or damage.
Charcoal canister cracked, holed or damage.
Open or short in vapor pressure sensor circuit.
Vapor pressure sensor.
Fuel tank over fill check valve cranked or damage.
P0446 (evap emission control sys vent ccontrol malfunction). Troubled areas:
Open or short in VSV circuit for evap.
VSV for evap.
Open or short in VSV circuit for vapor pressure sensor.
VSV for vapor pressure sensor.
I've looked over what i could (hoses, gas cap). I am asking for specific things to look for before i take it to Toyota (im not dealing with the jokers at Lexus of Jacksonville if i dont have to ever again). Is there anything else i should try/look for? How bad is it to keep driving with these issues?
Ive had the intake/ecu problem free since about 28k miles, and i just did a Mobile 1 Synthetic oil change 1.5k miles ago. No other mods besides my l-sportline kit, new tires, and new radiator cap (+20 hp, i swear) recently.
Thanks guys in advance, and sorry for another one of my novel sized posts.