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88 civic dx fails CA smog
Two years ago my dx failed smog and I put a new oxygen sensor and cat on pass with acceptable levels. The quick fix got me through but my time has come again. These readings are from the dyno style smog check. Here is where she failed @15mph Co2 14.5 O2 0.00 HC 116 CO 1.11 NO 1000 She passed here. @25mph Co2 14.9 O2 0.00 HC 63.0 CO 0.25 NO 438 The car is due for an oil change with 3100 on the current oil. Timing is 18 degrees. The plugs and wires have a few miles on them and I am going to change them. What other culprits should I be looking at? Thank you for any help. -Brian G -- Brian G ------------------------------------------------------------------------ Brian G's Profile: http://www.automotiveforums.com/vbul...?userid=442515 View this thread: http://www.automotiveforums.com/vbul...d.php?t=532934 http://www.automotiveforums.com |
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#2
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88 civic dx fails CA smog
It appears your HC, CO, and NO rose from 25 mph to 15 mph. I
am not sure which is the greatest concern, but for starters I'd be looking at replacing the PCV valve ($20 or so part; easy to replace on your car; can make a big difference); doing a complete tuenup (use only OEM ignition wires, plugs, distributor cap and rotor; put in a new air filter and fuel filter; check the timing); Then I'd assess the EGR system (assuming your Civic is carbureted; is it?). The above is taken from http://www.aircare.ca/index.php?repinfo-glossary.php http://www.interro.com/techgas.html#anchoreleven You go the particular compound emitted, then click or read on causes of why it is out of spec, etc. There are more fixes than the ones I list above. Updates welcome. This should be interesting (though sorry about your troubles). "Brian G" > wrote > Two years ago my dx failed smog and I put a new oxygen > sensor and cat on > pass with acceptable levels. The quick fix got me through > but my time > has come again. > > These readings are from the dyno style smog check. > > > Here is where she failed > @15mph > > Co2 14.5 > O2 0.00 > HC 116 > CO 1.11 > NO 1000 > > She passed here. > @25mph > Co2 14.9 > O2 0.00 > HC 63.0 > CO 0.25 > NO 438 > > > The car is due for an oil change with 3100 on the current > oil. Timing > is 18 degrees. The plugs and wires have a few miles on > them and I am > going to change them. What other culprits should I be > looking at? Thank > you for any help. |
#3
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88 civic dx fails CA smog
Brian G wrote:
> Two years ago my dx failed smog and I put a new oxygen sensor and cat on > pass with acceptable levels. The quick fix got me through but my time > has come again. > > These readings are from the dyno style smog check. > > > Here is where she failed > @15mph > > Co2 14.5 > O2 0.00 > HC 116 > CO 1.11 > NO 1000 > > She passed here. > @25mph > Co2 14.9 > O2 0.00 > HC 63.0 > CO 0.25 > NO 438 > > > The car is due for an oil change with 3100 on the current oil. Timing > is 18 degrees. The plugs and wires have a few miles on them and I am > going to change them. What other culprits should I be looking at? Thank > you for any help. > > -Brian G > > ok, but you need to post what the passing levels are as well. presumably it's failing NO and CO. high NO on its own means either combustion temp is too high or the cat is ineffective. if the latter, as it could easily be, especially since the 15mph test is done /before/ the 25mph test, that the cat was not up to working temp. particularly as you also have high CO. did you leave the motor running while you were waiting to go up on the dyno? if the motor was off, the cat cooled down. the tech should not have accepted the vehicle as test ready if the cat was not up to working temp. if it was just NO, and if the vehicle's automatic [you don't say], check and clean the egr valve. also, replace the plugs, leads, distributor cap and rotor arm. pcv valve and decent quality oil helps too. also, check the timing with the ecu over-ride jumper in place. it takes ignition timing back to base to allow adjustments to be correct. making sure the valve lash is correct helps too. and coolant level. lastly, go to a test-only station. the "test & repair" places know all the tricks to have you spend money with them. dmv has a list online. |
#4
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88 civic dx fails CA smog
Brian G > wrote in
: > > Two years ago my dx failed smog and I put a new oxygen sensor and cat on > pass with acceptable levels. The quick fix got me through but my time > has come again. > > These readings are from the dyno style smog check. > > > Here is where she failed > @15mph > > Co2 14.5 > O2 0.00 > HC 116 > CO 1.11 > NO 1000 > > She passed here. > @25mph > Co2 14.9 > O2 0.00 > HC 63.0 > CO 0.25 > NO 438 > > > The car is due for an oil change with 3100 on the current oil. Timing > is 18 degrees. The plugs and wires have a few miles on them and I am > going to change them. What other culprits should I be looking at? Thank > you for any help. > Your CO2 is way too low. And all your other numbers are quite high. Either the cat wasn't warmed up sufficiently, or it's cheapo aftermarket junk that only lasts a couple of years. In addition, you could have a problem with clogged EGR passages. -- TeGGeR® The Unofficial Honda/Acura FAQ www.tegger.com/hondafaq/ |
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