2000 Sienna Misfiring

Does the Sienna have a code to report lean for each bank of the V6? or just a generic system lean code?

In any case, the above codes suggest there could be a intake leak - i.e. intake manifold gasket perhaps... or maybe even a bad MAF?

Nirav

I don't know if that code exists, anyone else?

The OBD II system will report a lean mixture for bank 1 and/or bank 2.

You can now bring it back to the dealer and tell them that the check engine light is still on for further diagnosis. If their work did not cure the condition, they should credit you for the ineffective work.

I didn't let them do the work, once they diagnosed I said thank you, bought the parts and did it myself. Saved $400, just don't have a working vehicle yet.

You have not saved diddley squat. In fact,you have wasted your money on all the parts you installed that have not resolved the condition. At the rate you are going, you will ruin your catalytic converter and can add another $1000 to your repair bill.

You have posted several requests for advice and information. qslm, a Toyota Master Diagnostic Technician, and I, a former Toyota district service manager, have provided you with quite a bit of advice and information. For whatever reason, you choose to ignore our advice and information and do your own thing and then when your own thing does not work, you ask for more information. If you are smarter than the automotive pros, then you don't need our advice. If you do not trust the automotive pros, then you should go ahead and take the advice of all the shade tree mechanics who frequent this group and take shots in the dark.

Dear Ray,

I'm posting what's happening in the progression that it occurs with my limited time and funds. Not knowing your god like status prior I would have knelt before you and realized I was wasting your time. No need to be a former Toyota district service manager ass. I will take no further of your so valuable time and advice.

Sorry, I didn't mean to come across as an arrogant ass (even if I deserve the moniker), however, if you had followed my advice, you would not have spent any money on parts yet. I do not have any idea who qslm is other than his signature and his history of being correct and giving excellent advice. Even if you do not wish to follow my advice, if you ask the regulars in this group, they will tell you that qslm gives advice that is right on.

If you go back and read my posts in the ng, you may note that I rarely recommend changing any parts based on the symptoms or conditions that someone posts or even based on trouble codes. That is because I do not wish to waste anyone's time or money and because experience tells me that swapping parts without checking whether they are good or not is an iffy proposition. What I do recommend is checking parts or systems based on those symptoms and codes, or in your case, swapping the coils with other cylinders if you have trouble checking whether the coils are good or not.

good luck on your repairs - you'll need it :-)

Thanks Ray. Didn't know I had that rep around here.

You absolutely do with me, and AFAIK, with the other regulars in here as well!

Hmmm. That lean code that you have now is new. I don't remember you mentioning that in your last thread. That kind of shines a new light on the whole deal. Assuming that the A/F sensors are reading properly (which they probably are... otherwise that engine would probably give you another code), that code suggests that there is too little fuel to have a proper combustion. If the source of the problem were ignition (which is what the dealer suggested, apparently), the computer would not tell you that it is running lean. This is because you would be dumping copius amounts of unburned fuel into the exhaust. I also noticed that you now have all cylinders in the 1st bank reporting a misfire... that would make one think that ignition is not really the issue. One question about the codes that you listed above; are they new since you installed all this new stuff, or are they still the same ones that have been hanging around for a while? Usually diagnosing driveability problems through the ether isn't terribly difficult on Toyotas as most problems are consistent through model runs. 3/4ths of the problems on this board are easy to pinpoint because we see the same thing on most other Toyotas of the same model. Sometimes you get wierd ones like this. In this case I would really need to see a real-time datalist to see where this percieved lean condition is coming from. I'm kind of disapointed in the factory techinian that recommended ignition components after seeing that lean code. A real tech should be able to pintpoint a problem in less that 30 mins by looking at a data list in real time. If you want to make a trip to DC I'll plug into it for you.

This attitude is uncalled for sir, Ray has given you much good advice and I quite understand his frustration with your methods.

I also agree that you've not saved the claimed ~$400, but have lost nearly that amount by replacing good parts.

Asking for advice then not following it doesn't sound brilliant.

As Ray says...good luck...

Gord and I agree.

"A fool and his money are soon parted"

- Philip

The lean code didn't appear until I changed the plugs and coil which were indeed bad despite the ramblings of some here. It has 71k on it, and the mechanic I spoke with today recommended changing the fuel filter, as Haynes manual recommened as well. I got the old filter off and the new one is impossible to get on. The intake end will NOT thread despite my best attempts. Any advice?

Dear Gorden,

The technician diagnosed a bad coil pack, should I have not replaced it? The technician advised new Toyota plugs as well. I changed them. So it there were bad and part of the total problem, should I have ignored them until I found the root? It might be as simple as a fuel filter, I'm just asking for advice here and following the Haynes manual..Stop being so arrogant and sensitive, geez...

I have been interested in this thread since I also own a 2000 Sienna with 88K miles.

Have you ensured the fuel filter is not turned around the wrong way?

Another place to get good Sienna information is

I'm sure its the right way