Just curious

A guy at a shop told me that on his Honda (he has a EG swap... or something like that), that he takes out (or I think he said disconnects) two of the fuel injectors to pass. Doesnt seem healthy for the engine... but he does it only when he is testing the car.

Anyway, any techniques out there?

Also, if I wanted to lower HCs on my car. Wouldn't it make sense to advance the timing?

 

run a little tad bit of alcohol. burns cleaner and could raise octane level . as well as burning cooler reduces HCS but brings up NOX so becareful if you do decide to try it research more. disconnecting 2 injectors sounds retarded and i dont even think your car would idle at all . timing is limited to +- 2 of the base timing so even if you could it would change the point of which the combustion will occur and could make for worse emissions

 

Why cheat? Why not just fix the problem? What car/engine/mods do you have?

Any CEL codes? How old are the plugs, wires, cap, and rotor? Is the ignition timing set to spec?

 

What state?

 

RonJ@HT:
I have competely tuned up the car. Im really busy lately because of finals at school. I will fix the problem soon, I think its the timing for sure. If not, I need a new CAT.
No mods, completely stock Honda Civic EX 1995 with 170k miles.

Everything passes cleanely. However, I am failing the idle test on HC by about 300ppm (parts per million) and the high speed test on HCs by 20ppm.

Im asking this question out of curiousity

 

You've got it backwards; NOx emissions form at higher temperatures.

Can you post all your emissions results (not just HC)?

What all in the ignition system has been replaced? If only HC is failing, it's probably missing a little. An inefficient cat could be the cause, but that's one of the last things I'd change.

I guess I could see disconnecting two injectors possibly cleaning up emissions in certain cases as long as you stay in closed loop and the MAP isn't too high. However, I certainly wouldn't count on it. Either way, it's a total band-aid fix, and the engine will shake badly. My concern (aside from your motor mounts) would be fuel vapors in the intake manifold being passed through the "dead" cylinders since the mixture would be too lean to sustain combustion.

 

HIGH SPEED
HC
Standard: 220
Reading: 248
Deviation: -28

CO %
Standard: 1.20
Reading: .65
Deviation: .55

C02 %
13.8 @ 2518

IDLE TEST

HC
Standard: 220
Reading: 506
Deviation: -286

CO%
Standard: 1.20
Reading: .68
Deviation: .52

CO2 %
13.1 @ 705RPM

 

It would be easier to diagnose with NOx readings.

Any CEL codes?

How old are the plugs, wires, cap, and rotor?

Is the ignition timing set to spec?

 

Last year (7k miles ago) i replaced plugs, wires, rotor, cap, PCV valve (near intake) and re-did the timing.

I replaced the plugs but kept everything the same.

I checked the timing today, re-adjusted it a little and the car feels smoother so I am sure its going to pass this time.

I created this thread more out of curiousity to see how you guys out there with the H22, B20, B18 and all those crazy Honda swaps, pass emissions

 

Hondas are notorious for running rich. It's a safety thing, if they always run rich, then even in the coldest environment with the weirdest off brand gas, being neglected, it won't burn lean. Too rich though, and cylinder walls get washed off and rings go bye bye and you burn oil...

So, I'm pretty sure most people just pass emissions on built motors by running a tune closer to what's really needed with the intention of getting more power. Running leaner increases temperatures, so then they pull a little timing to knock their NOx reading down.

There are products out there to help pass emissions that are supposed to work.

There's always the option of having Ben Franklin talk the test guy into letting you pass...

 

Lol here in germany they dont accept bribes and you are on camera, and there is 4 people doing it at the same time so there is no chance in hell

 

You don't think Honda would test ring wear with a rich mixture before selling the car?

When you're in open loop that might be true, but you should always be running a stoichiometric mixture to pass an emissions test.

 

Try Seafoaming it?

 

stoich is 14.7 afr regular fuel.. e85 is what i was refering to (9.1) stoich so thus making a leaner mixture . this is why people say you must use 30-40% more fuel by using it. leaner= more heat = more nox

 

Oh, I see what you mean. It depends on how large of a fuel trim the ECU can apply and how much alcohol you put in the tank. If it's just a small amount, the ECU will still run a stoichiometric mixture during the test, and NOx emissions will go down.