An expert who has achieved level 3 by getting 1000 points
An expert that got 10 achievements.
An expert that got 5 achievements.
An expert whose answer got voted for 100 times.
Re: 3.5l Ra Rodeo running rich
I have seen 2 things that cause this on the V6 6VE1 petrol engine, one could be a pin hole in the fuel pressure regulator diaphram causing fuel to be sucked into intake manifold. the other is a bad wire crimp joint for main earths which is in main wiring loom under injector rail on left bank between the first and second injector (black wires with black tape that has all white sticky stuff under it) take wires out of plastic tubing to find splice joint remove sticky gooie tape and clean with electrical contact spray and dry then soilder joint and re tape up. can confirm this fault by pulling moving loom when engine running and noting readings changing on scan tool for O2 sensors and possibly engine running rough then good.
should then reset fuel trim cells with scan tool after either repair then watch the short and long term fuel trims they wont be as high as they were which would have been 25% or higher to bring on check engine light and set your rich fuel trim codes.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
Code 300 is for a random miss. 172 and 175 are for the same problem - 172 is for a rich fuel mixture bank one and 175 is for the fuel mixture too rich on bank two. Code 143 is for a rich mixture for sensor number 3. All of the codes could be connected to a leaking injector or other fuel problem. Very seldom are all of the O2 sensors faulty at the same time.
The codes are for the O2 sensors telling the computer the fuel mixture is too rich. One code for each side of the engine. When this happens, the computer tries to turn down the injectors which makes the engine run too lean. Since you have a code for both sides, I doubt the sensors are faulty. You probably have a real problem with the fuel mixture. You would need to check fuel pressure and look for fuel leaks into the cylinders.
These codes mean system too rich, meaning too much fuel while running, I would check the vacuum lines and then clean the Mass Air Flow sensor (MAF), it should be located in line with the air intake tube from the air filter. Be careful not to damage the sensors internal components (use electrical cleaner or brake cleaner), and make sure it is dry before re-installation. Hope this helps, let me know.
Changed the air filter lately? Possibly defective O2 sensors, but I doubt it. If air filter and intake are clear, I'd check barometric pressure sensor and mass air flow sensors. Get a Haynes or Chilton's for $25 at Pep Boys for instructions on testing these componenets
If the fuel pressure was low enough to give lean codes then u would have a loss of power that you would easily notice, you say you checked for vacuum leaks, did you use a can of carb spray or a bottle of propane? it only takes a very small leak to trigger the codes, spray carb spray around the intake area, see if the engine sound changes, this will indicate a leak,