Car wont pass smog..... need some help!!

[3vilE30]

Any update on the e85? Probably better if you mix 3:1. Plan on using it Monday morning since I failed today. Going to check picknpull if I can find some larger injectors to run full e85.

In 4 results with 100% e85 on an untuned ecu.

Seriously, if you failed there's something wrong
Somewhere.

[THEhomelessONE]

Any update on the e85? Probably better if you mix 3:1. Plan on using it Monday morning since I failed today. Going to check picknpull if I can find some larger injectors to run full e85.

[Wasefi]

Have you replaced the fuel filter? Last time you had the valves adjusted? Definitely try the voucher. Maybe clean up the afm.

I'd try a 1:1 ratio with a couple gallons of 91 and e85 first on a low tank. Minimal $$$ and effort needed.

I have been hearing a couple of people telling me to try E85 but I have not tried it yet.

[THEhomelessONE]

Have you replaced the fuel filter? Last time you had the valves adjusted? Definitely try the voucher. Maybe clean up the afm.

I'd try a 1:1 ratio with a couple gallons of 91 and e85 first on a low tank. Minimal $$$ and effort needed.

[3vilE30]

Before you spend more money I suggest you log on to the smog website California has for cars that have failed smog. If you qualify, a 500 dollar voucher will be given to you for emissions repairs. The website is listed on your smog results

Before you spend more money I suggest you log on to the smog website California has for cars that have failed smog. If you qualify, a 500 dollar voucher will be given to you for emissions repairs. The website is listed on your smog results

http://www.smogcheck.ca.gov/80_BARResources/01_CAP&GoldShield/cap_program.html

Known as the CAP Program

and if you need more free dough for repairs

http://www.vrrrm.org

As a last resort find someone that lives in a smog exempt county. Or if you need time find someone that lives out of state like a family member or friend and claim out of state residency for the coming year. DMV will mail whom ever you choose your tags and just have them mail it to you.

[mymonkey562]

My 91 had high nox reading of 2100 gross polluter, changed the cat still failed cleaned my fuel injectors and I passed

[NorthridgeE30]

Bar

Before you spend more money I suggest you log on to the smog website California has for cars that have failed smog. If you qualify, a 500 dollar voucher will be given to you for emissions repairs. The website is listed on your smog results

[Wasefi]

The o2 levels are pretty low co is above average co emissions is control by the o2 sensor would recommend replacing o2 sensor first since that will regulate your fuel mixture should help with your NOx problem.

I tested the o2 sensor a couple of months ago and the readings were good. Maybe i'll just replace it anyways.

[cervantes559]

I replaced the coolant temp sensor, ran 100 octane fuel in it and it still failed:

15 mph (max 815 ppm) my measurements (843 ppm)


Going to replace the catalytic converter and O2 sensor and see if that helps.

The o2 levels are pretty low co is above average co emissions is control by the o2 sensor would recommend replacing o2 sensor first since that will regulate your fuel mixture should help with your NOx problem.

[Chilezen]

Dude 100 octane is worse for your car. It's literally harder to burn, especially since the cr is like 8.5, not something particularly high. You end up having more unburnt fuel in the cat. Although I imagine your car failing is due to some other issue I can't put my finger on. But hey, mine doesn't pass smog either, so what do I know..

[Wasefi]

I replaced the coolant temp sensor, ran 100 octane fuel in it and it still failed:

15 mph (max 815 ppm) my measurements (843 ppm)


Going to replace the catalytic converter and O2 sensor and see if that helps.

[noypi2]

Same problem....

I have the same problem. My 84 e30 318i failed smog test today. First try is high NOX/Gross polluter. Went to muffler shop and replace the cat and retest it... failed again. I guess ill try to replace the O2 sensor and coolant temp sensor next. Is their anybody in SD area who could do for reasonable price? Help please!!!

[Wasefi]

Try the coolant temp sensor, only like $10. Beat the hell out of it before you bring it in, don't let em shut the car off or let it idle too long. My stock cat on the 318is passed smog even with over 500k and a chip lol.

Will have to try this out this weekend, probably a good sign of why my temperature gauge jumps around.

[THEhomelessONE]

Try the coolant temp sensor, only like $10. Beat the hell out of it before you bring it in, don't let em shut the car off or let it idle too long. My stock cat on the 318is passed smog even with over 500k and a chip lol.

[Navarone]

A quick google search says that you soak the cat in a hot water and citric acid solution for about 6 hours. The amount of citric acid looks like a pound per gallon, but that seems pretty excessive, and 6 hours? I bet it would work better with some agitation like a sonic bath.

You should follow the tried and true directions. I like to fiddle around so I would mix the hot water and citric acid and pour it through the cat over and over, or fill it half full and cap the ends and shake it for a few mins and then dump the water, wash rinse repeat with new mix until the water comes out pretty clear.

Citric acid is a pretty mild acid too, I wonder how phosphoric acid would work. You can find it a brewers and hydroponic supply stores being used as a PH down. Citric acid can be found in animal supply places and some food places called sour salt. Cola is pretty acidic, or just crush up a pallet of vitamin C tablets and use that!