could you help me out with a couple codes i got today..

Fuel INJ sys left bank:lean
Knock Sensor

 

Please provide the 4-character Diagnostic Trouble Codes and any symptoms you have observed in addition to the Service Engine Soon light.

What kind of fuel do you use? What is the Anti-Knock Index? Is it gasoline or gasohol?

 

The owner of my Maxima, before myself, always used 87 gasoline, does that mean I should reset the computer and use 93 for this "Knock" business.. or am i fine as is?

 

This was 1 day after y pipe install.. however i am not sure if the two are related..

codes are 0210 and 0304

I think i am seeing white smoke, but not sure if it was cold and i am just paranoid right now..

Prior to getting the code i did fill up in at a Texaco in Greenwich CT

I have always used 93 Octane and Mobil 1 Oil ...

One suggestion i have heard is the Fuel Pump might be had.. however as a note.. i think my fuel filter needs changing and my spark plugs also

any help you can give will be greatly appreciated..

 

One of the possible causes is "exhaust system leaks". Double check to see if there are any.



i think my fuel filter needs changing and my spark plugs also

Doing this could also help your situation. It won,t hurt to try.

 

I just changed the plugs and they were extremely shot..

I am changing the fuel filter tommorow

 

Diagnostic Trouble Code 0210 points to a problem with the fuel injection system. When the engine management system is running in closed-loop mode the Engine Control Unit (the computer) makes continual adjustments to maintain the air-fuel ratio near the ideal point. To achieve this it relies on signals from many sensors including the Mass Air Flow Sensor and the Oxygen Sensors.

This malfunction is detected when the ECM finds that it cannot properly control the air/fuel mixture, and the mixture is too lean (too much air). DTC 0210 indicates this problem exists on the left bank (the front bank, cylinders 2, 4, and 6). Possible causes include ...
- Intake air leaks
- Front Oxygen Sensor
- one or more fuel injectors on the front bank
- exhaust gas leaks
- incorrect fuel pressure
- lack of fuel
- Mass Air Flow Sensor

 

Diagnostic Trouble Code 0304 points to a problem with the Knock Sensor. The KS is attached to the cylinder block. It senses engine knocking using a piezoelectric element. A knocking vibration from the cylinder block is senses as vibrational pressure. This pressure is converted into a voltage signal and sent to the Engine Control Module (The computer).

This malfunction is detected when an excessively high or low voltage from the KS is entered to the ECM. Possible causes include...
- the harness or connector (The KS circuit is open or shorted).
- the KS

The KS may be checked with an ohmmeter.

1) Raise the hood. View the engine from the driver's fender. Look into
the deep valley between the cylinder banks and below the intake manifold.
Identify the KS as a black item fastened to the block by a single vertical
bolt. A wire harness wrapped in black leads toward you, out of the valley.
That is the KS sub-harness.

2) Follow the KS sub-harness to it's nearest connector. This is connector F121.
It is located near the upper right-hand corner of the valve cover of the forward cylinder bank, as viewed from the front of the car.

3) Disconnect F121. You have to do a "press the latch and wiggle and
pull" to disconnect it. F121 has only two pins; if you see more than two
pins, you have the wrong connector. Use a digital ohmmeter capable of
measuring more than 10 Megohms. You want to measure the pins of F121, not
the sockets of the matching connector. Measure the resistance between a
good ground (such as the battery negative terminal) and pin #2 of connector
F121. On my car this is the highest of the two pins, the one closest to
the front of the car. The factory spec is 500 - 620 Kohms.

The manual says you have to remove the intake manifold to replace the KS. However, I think that a person with good dexterity and a 10mm ratcheting box wrench could replace the KS without disturbing the manifold.

 

There is a good chance these two Diagnostic Trouble Codes are related. A lean mixture will cause pinging (engine knock). An episode of severe engine knock may reveal a faulty Knock Sensor, previously unrecognized.

You should examine that newly-installed Y-pipe to see if there is any leak. Verify that both Oxygen Sensors are properly connected.

A lean mixture due to low fuel pressure is also a possible cause of both codes. This could be caused by a weak fuel pump, an obstructed fuel filter, or a faulty fuel pressure regulator. Go right ahead and replace that fuel filter. If the problem persists you may want to make a fuel pressure test. That would reveal a weak pump or a bad regulator. This is a standard diagnostic test which may be made by the home mechanic. You will find instructions in Chilton (page 5-3) and Haynes (page 4-3,4).

 

Fine as is. Enjoy the ride!

 

Daniel... your awesome. I showed a friend of mine your posts, and he says they need more guys like you that know their sh*t on the is300 forum. I'd have to agree. Good lookin out man.

p.s time to wipe my nose. =)

 

Hey nismo808, very offtopic, but...what is the web address for the Lexus is300 board? thanks a lot!!

casey

 

www.is300.net

 

Thanks for all your help Daniel.. you are very knowledgeble and helpful ..

the update..

Saturday Morning i reset the CE light...

Saturday After .. replaced my spark plugs.. the older ones were shot..

Sunday Morning.. replace fuel filter.. the old one was dirty and as soon as i started the car i noticed a huge difference..

The CE light has not come back on since.. however i have to drive a long mile to work tommorw and will see if it comes back on..

I also have to take the car back to the muffler shop for them to put on washers to stop my y pipe/dash rattle

will keep you updated

 

That's good news!

If you have the time and interest, carefully open the old filter and examine the filter media. If you see sand and brick dust, that means you bought contaminated fuel at some point. If you see greasy or rubbery black gunk, that could be an early warning of fuel pump wear.

See Steve Cutchen's excellent MaxFAQ page http://web2.airmail.net/scutchen/max_faq/ for a photo of a cut-open filter.

 

Are you from Greenwich?

 

Thanks Daniel.. unfortunately i was so excited i tossed the filter .. i will watch it for a couple days..

ChesireCat.. i live in waterbury, work in greenwich