I've seen mechanics put a large fan (room fan), in front of the car radiator blowing into the radiator actually lower NOx readings when a vehicle was on the emissions dyno.
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BTDC is "Before Top Dead Center" if I recall correctly. Top dead center is when the piston is closest to the spark plug, and it is called 'dead' because the circular to linear translation of the crankshaft to the piston results in the piston being motionless for a moment during constant camshaft rotation. Ignition should occur shortly before the piston reaches the top of the compression stroke, this is the 'advance' and is usually given as an angle. ECUs in modern engines can adjust the ignition timing.
I believe there is a mark on some flywheel used to coordinate the ignition timing with TDC of #1. I personally haven't timed an engine with a timing light, so my explanation is theory.
There is also a bottom dead center, but it doesn't matter for ignition timing.
I have a Civic with the D15B7 and it should have a MAP (manifold absolute pressure) rather than MAF (mass air flow) sensor. I doubt the MAP sensor is causing this problem.
EGR was designed to address the NOx issue, as others have already explained.
I believe there is a mark on some flywheel used to coordinate the ignition timing with TDC of #1. I personally haven't timed an engine with a timing light, so my explanation is theory.
There is also a bottom dead center, but it doesn't matter for ignition timing.
I have a Civic with the D15B7 and it should have a MAP (manifold absolute pressure) rather than MAF (mass air flow) sensor. I doubt the MAP sensor is causing this problem.
EGR was designed to address the NOx issue, as others have already explained.
bearz, any nox issues with your D15B7 ? (same as mine).... can an egr be added to an engine that doesnt have one?
vairox, my D15B7 has propelled this early 1994 Civic over 210k miles and didn't fail NOx emissions last time it was tested in GA. The spark plugs look good when changed at 30k mile intervals. The engine runs well so I have never bothered to look at the piston crowns. It does not consume oil.
If an engine doesn't have EGR I doubt you can add it. If it was designed without EGR it should be able to pass emissions without EGR. Has your Civic been modified?
If an engine doesn't have EGR I doubt you can add it. If it was designed without EGR it should be able to pass emissions without EGR. Has your Civic been modified?
not modified, just want to pass smog, the nox was well over 2x the limit.....everything else passed, im stumped
MMO shouldn't be sucked in through the PCV. Its too thick and not solvent enough.
A little carbon or soot is normal. Don't be fooled by all those that want or think they need spotless pistions.
Just use a good FI cleaner 4x a years and you won't need to worry about buildup. And, if you want to maintenance dose, use the Marvel of other product for that.
I too like Bosch plugs. Its the gimmicky 2 prong and 4 prong plugs that I WOULD avoid. Bosch single platinum and standard plugs, IMO, work excellent. I find that most plug problems come from improper installation.
http://www.troublecodes.net/articles/smog.shtml
A little carbon or soot is normal. Don't be fooled by all those that want or think they need spotless pistions.
Just use a good FI cleaner 4x a years and you won't need to worry about buildup. And, if you want to maintenance dose, use the Marvel of other product for that.
I too like Bosch plugs. Its the gimmicky 2 prong and 4 prong plugs that I WOULD avoid. Bosch single platinum and standard plugs, IMO, work excellent. I find that most plug problems come from improper installation.
http://www.troublecodes.net/articles/smog.shtml
WAG how old is the O2 sensor?
wag? my O2 sensor was replaced with a brand new OEM one when it failed smog, failed harder after it was replaced.... enough to be called a gross polluter where before, it wasn't...weird
1.) Go get your timing set. Yours sounds retarded.
2.) My fiend has a 1992 and works flawlessly and gets over 45mpg and has soot, you can't get rid of all of it.
3.) Replace the O2 sensor.
4.) Change the oil ASAP. The amount of crap you put in there for cleaning didn't all get burnt, it is partly in the oil now.
2.) My fiend has a 1992 and works flawlessly and gets over 45mpg and has soot, you can't get rid of all of it.
3.) Replace the O2 sensor.
4.) Change the oil ASAP. The amount of crap you put in there for cleaning didn't all get burnt, it is partly in the oil now.
won't the soot itself cause you to fail smog since it's combusted oil or whatever being sent out the pipe and into the sensor?
ok really....i thought it always involved oil being burnt.... back up the tailpipe the stuff is like charcoal....anyhow, we shorted the computer (like the book says) and set the timing how the book said to do it, with a timing light and getting the stupid red dot in the middle of the 2 lines etc... this was about 2 years ago, should it be reset
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