Use good injector cleaner and drive specifics
Supposing you're not throwing an error lite: Use techron fuel additive to clean the injectors so they spray properly, a fine spray versus clogged/droplets. Do not cheap out on the $2 stuff, get techron. bg44, redline.
After you've run that thru the tank, When you get ready to have the test done, the deal about driving is to get *and keep* the cats hot.
So knowing a time when they're not busy at the inspection lane is really useful, as when you sit in a line for 20 minutes at idle, the cats cool off and the engine loads up. Since the goal is to get them hot, drive in lower gears than normal for 20 minutes keeping the RPM up to 3000 or so, hopefully at highway speeds, quickly getting to the inspection place w/o going thru slow traffic.
If you're throwing check engine codes, get those fixed first, but if the o2 sensor is bad you should be throwing a code. I think cats are warranted to 100k miles by law, and they shouldn't normally fail at 50k.
Let us know if it works for you, it certainly has for others.
I've been looking for my "guy" a while
Sunnyvale area. I have 2 that I have used. One guy did let me adjust timing outside of spec on my Honda/B18c swap (which was BAR certified) to get it to pass.
Sounds like your car needs new CAT. You should be under the CAT warranty still (I thought it was 7 years, 80k miles, separate from the car warranty).
With numbers that high, might be time for new cats
Maybe putting in 100 octane wouldn't hurt either.
Costco is rotgut gas, low in detergent
Costco, Sam's, indepentent dealers, uses "spot gas," gasoline bought on the open market. Insufficient detergents cause clogged fuel injectors and also cause build up of crud on intake valves.
The EPA mandates a minimum level of detergents. But, GM, BMW, Toyota, Honda, and VW have set a higher standard called "Top Tier" gas. They did this because they were having warranty claims with rot gut gas and cars with clogged injector and deposits in intake valves don't pass emmission tests. It's noteworthy that Exxon and BP/Amoco don't meet the standard. Shell, Chevron/Texaco, 76, and Conoco/Phillips.
Actually, gasoline in pipelines is all the same. The quality brands add detergents before it's delivered to the dealers.
Re: 2003 M3 failed smog test
Just another curious question, on the web, says this categoy failed means the oil is not burned completely.
Shouldn't this affect the mileage?
I kept my receipts for filling up the tank, my mileage does not vary much between each fill-up.
What is your opinion?
HC broken down by cat converters
So, running with your theory, increased HC and no decrease in mileage would suggest bad cat's.
Re: HC broken down by cat converters
Or this is just a very minor portion of gas. It has no impact on the mileage. Just curious ...
I am not expert in this...that is why I am asking the web.
Re: 2003 M3 smog test today passed
Today I was thinking to send the car to check at Dinan mt view.
Arrive there and the gentleman there told me to do the test again with the same recommendations you guys said. Drive hard before test.
So I did that. For the last 10 min, keep rpm at 4000-5000. Total driving time is about 50-60 minutes on freeway. (Fremont to Mt View then back to Fremont)
Before the actual test started, the car was idle for about 5-10 min.
It did pass this time.
pass result: HC 15 mph 23 , 25 mph 12 (failed result was both 85)
CO and NO sections are both reduced great amount too.
My own thoughts,
1. Beofre making a trip to the dealer, ask the web (thanks to you viewers here)
2. Sign-in person at the dealership may not have good knowledge on what customer should do before spending the money. ( if I directlty go dealership, i think minmum 200 dollars ) I will continue to have my service at Dinan Mt View.
3. Regarding the type of gas, I feel there is no difference.
But adding the techron concentrate seem to make my SMG shifting smoother and at lower speed smoother too.
Excellent news! Maybe the original test was bad?
Might be the guy in your car doing the test originally was modulating the throttle a lot, this might cause it to run really rich, giving you higher HC numbers.
Or your CAT's might be getting "weak" and they needed to be really hot to pass.
Either way, Congratulations! You are set for 2 years.
Re: Excellent news! Maybe the original test was bad?
I went to the same smog test station, the same guy did the test.
The only difference is the time of driving. From my home to the test station, less than 5 miles.
During the first test, actually he did try to warm up the car on site, he ran the test 3 times and all failed.
That is date I asked the web for help.
Re: anyone doing CAMPAIGN # 08E-A03
This notice was a bit too late for me....
How many people are going to do this fix?