Need Some Advise Asap

[gunni]

Hi guys/girls...

I have a BAD problem with my 02 IS300.. The thing is that the car started some weeks ago to shut off the engine while driving and wont start again to run, from 2-3 minutes up to 20 minutes..Sometime the engine starts but when the throttle is advanced the engine kills again...some times its seems to work if you have full throttle and then put it instanlly to D(drive)

then mabye some miles but most often the engine goes off when slowing down and stopping at the traffic lights.....I have a Injen air intake wich is aftermarket...The car runs when i disconnect the IAT sensor but it has to be started twice and it wont go over 3000 rpm...I have been to the Dealership for diagnostic and the said the this must have been IAT sensor with a fault, so I bought a new one ok.....IT changed nothing...then the Dealer said its the O2 sensors, ok so the got replaced...The car ran smooth and normal for 6days but then started to behave like described....The dealer guys says the only thing they get from the diagnostic is the IAT sensor code and that is because its the INJEN air intake...but the sensor is new..SO THEY HAVE NO IDEA WHAT TO DO....The car was at the dealership for 4 weeks with no results.........MY question to all of you is Can you give me some advise what it is that is troubeling my car..

ALL HELP AND ADVISE IS VERY APPRECIATED

thanks

[bartkat]

Put the stock intake back on and see if the problem goes away. Sometimes the engine cooling fans cause turbulent air that messes up the air flow sensor when you have one of those big cone filters inside the engine bay. This most often happens when coasting to a stop or while stopped and idling. Aftermarket intakes can also cause a false signal from the air flow sensor due to having to relocate the sensor on the intake. While you're at it, get some electronics spray cleaner and clean the air flow sensor too.

[gunni]

Ok. Do you think there is available some "dummie" for the sensor..recall that sometime people had to do something like that to get the check engine light out ?? THink this is somewere avai ???

[bartkat]

I don't know of any dummie for the MAF. If the MAF Isn't getting a proper reading the motor just isn't going to get the right signal to adjust the fuel/air mixture. The point about the turbulence from the fans is that the throttle body really is getting poor airflow and that's why it can stall.

There are Sims for the Oxygen sensors in the exhaust though. Sometimes those are needed to get around CEL's from Headers or exhausts that eliminate any cats.

[gunni]

and IS it possible if the MAF sensor is given wrong signal can the engine die ? even though the throttle pos is variable ?

[bartkat]

Trust me. Clean the MAF, put the stock intake back on, reset the ECU and try it out.,

[smooth1]

How long have you had the cold air intake on it? And what kind of filter are you using? Did they happen to tell you what code is coming up? I'm wondering if it's your knock sensor.

The knock sensor located on the cylinder block detects spark knock. When spark knock occurs, the sensor pick up vibrates in a specific frequency range .When the ECM detects the voltage in this frequency range, it retards the ignition timing to suppress the spark knock. The ECM also senses backgraound engine noise with the knock sensor and uses this noise to check for faults in the sensor. If the sensor signal level is too low for 10 seconds, and the knock sensor output voltage is out of normal range, the ECM interprets this as a fault and sets a DTC.

[gunni]

The Intake has been installed for 19 months now. And about the Error code they didnt gave it to me..

Is it a major problem replaceing the knock sensor ?

I am waiting to get the stock AIR intake since it didnt came with the car when i bought it. Looking for used one if anybody know about one :)

Gunni

[smooth1]

Where in Florida are you?

[heyoceanfloor]

i have the resonator, but not the whole dealio. smooth may be able to hook you up though :)

[gunni]

I am actually in Iceland...I have only a vacation home in Florida...So I would need the item sent to me overseas..Tell me if you can help me on this..

Thanks

Gunnar