FOMULA91

iTrader: (3)

I'm a little lost now. Failed 3 time and my # for 15 MPH HC is getting worst after replacing parts.

89 CRX with JDM B16A.

I have the same set up since 2010 and past smog emission for 2012 and 2014 using stock USDM P30 ECU.
I barley past the 2014 smog (MAX 94 and Meas was 94) so I knew a new Catalytic Converter was needed for this year.

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1st attempt

Replaced Catalytic Converter (CA approved Magnaflow for DelSol VTEC) and ran a tank of fuel injector cleaner before the test. Drove 18 freeway miles for warmup.

Failed 15 mph HC at MAX 94 and my Meas was 107.

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2nd Attempt

Replaced PCV and found a damaged hose on the 2 way canister so I replaced that. I also used a can of seafoam and changed oil with Mobile 1. Drove 35 freeway miles for warmup.

Failed 15 mph HC at MAX 94 and my Meas was 109.

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3rd Attempt

Changed fuel filter and O2 sensor since it was the same one since 2010.
I also adjusted the timing to 16 BTDC to 15. Drove 65 freeway miles for warmup.

Failed 15 mph HC at MAX 94 and my Meas was 114.

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I know high HC mean raw fuel but the 25 mph reading is all good...

Did anyone ever had similar problem? My next step will be replacing the thermostat since people recommend it and maybe replacing the fuel injector?

24TEN

iTrader: (2)

Are you still running the fuel injectors that use the resistor box?

FOMULA91

iTrader: (3)

What's up CJ!!!

Nah, I'm running OBD1 with Saturated fuel injector.

I have extra OBD2 LS injector so I'm swapping it out with that one next and replacing the spark plug as will.

24TEN

iTrader: (2)

https://honda-tech.com/forums/honda-...rbons-3079979/

My experience. After replacing a few things I just thought about it logically and decided that maybe the injectors needed to be rebuilt. The thinking behind the high HC was that the injectors weren't fully closing making it get a bit of extra fuel that wasn't being combusted. I don't know if that's exactly what was causing it but rebuilding the injectors was the solution for me.

FOMULA91

iTrader: (3)

Good to know.

Was your result similar to my # where I failed 15 mph HC but past 25 mph?

Former User

Have you done an ignition system tune up?

24TEN

iTrader: (2)

Yes, it should show in the pics if it's not blocked for you. Same scenario but like "RonJ" suggested (or maybe I should say is going to suggest) I did everything else possible prior to the injector rebuild. It's not a typical solution but in my case it was the solution after all else failed. That's the reason why I was asking about what type of injector you're using in case you'd like to borrow them.

v4lu3s

based on CO% test one was leaner than 14.72:1, test 2 probably right at 14.7:1 and test 3 was back leaner than 14.72:1

what condition are plugs and wires in? also is your compression healthy?

Ludster

I ran into this issue last week, but with a BAR'd GSR. What octane fuel are you using?

Check that your FPR is working correctly and all of your vacuum lines are not leaking.

I was only failing low speed HC. Changed my FPR, ran 87 octane and passed. My old regulator was causing excess fuel at low speeds and using a lower octane should help you get lower HC readings

FOMULA91

iTrader: (3)

I replace the cap and rotor with OEM Honda about a year ago and have a NGK spark plug wire that's about 2 years old.


I just replace the spark plug (with NGK) and replace the OBD1 fuel injector with OBD2 (shaving the outer edge). Feels like its running smoother and I also threw in the Chevron fuel injector cleaner.


Just replace the spark plug and I have the blue NGK wire which is about 2 years old. The last time I checked compression, about half year ago, it was reading at 180 to 175 all around.


I don't have the gauge to check the actual pressure on the FPR but I did do the simple test which I unplugged the hose to see if any gas was leaking while the engine running. Seems to be working fine without any leak. I also check for any vacuum leak and did find one on the hose from the canister to the throttle body.
for fuel, I usually use 91 octane but for smog, I run 87 Octane.

4drEF

Try 89 octane - 87 is a bit low for a B16.
Don't test on fuel that has any additional additives like fuel injector cleaner.
No way to tell what that may or may not be doing.

thesmogman

Try advancing the timing to 18btdc, That will make sure you get a complete burn of the fuel. Might raise NOx but you have room to go higher. I agree with 89octane too.

Clean air filter?

FOMULA91

iTrader: (3)

Thanks for all the advice everyone.

Went to the test station yesterday after swapping the fuel injector and replacing the spark plug.
Fill up the tank after running 300 miles and barley past.

24TEN

iTrader: (2)

Good enough! 2 more years of fun!