Emissions Failure- Idle HC's - Defender Source
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  #1  
Old June 14th, 2013, 05:54 PM
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Ross Simpson
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Arrow Emissions Failure- Idle HC's

The DMV welcomed me last week to the great State of Virginia with a nice "REJECTED" sticker from my first emissions test with the 95'. Up to this point, I'd managed to avoid the testing throughout all of my career moves, but finally it appears to have caught up with me here in Arlington.

The only failed portion of the test was at idle- 162 HC ppm (125 limit); damn close. The 2500 test registered only 24 HC ppm, and CO percentages for both tests were almost nil. What assumptions can be made from this?

Before you answer- my Defender has anything but a "stock" system. Trailhead Y-pipe mated to Random Tech Bullet cats (49-state emissions legal), and then on to a Dynomax VT muffler via 2.5" 304ss tubing.

The EPA and I thank you...
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  #2  
Old June 14th, 2013, 06:08 PM
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Jason Lavender
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Sounds like you need to clean-pipe it .

Btw...you coming to HH this week?
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  #3  
Old June 14th, 2013, 06:15 PM
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Todd
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I get that final exam anxious feeling every time I take the 90 in for emissions. I'm batting .000 at first time pass.

If you didn't take her in hot you may want to try taking her on 395 or 66 for 30 min or so to get the engine nice and warm before they take the readings...it seems to make a difference. Also, changing oil has been rumored to help get the HCs down for a reading.

My last fail was caused by a loose 02 sensor...that was an ordeal to track down.

If you want suggestions on where to take her if she needs work...just let me know.

Good luck,
Todd
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  #4  
Old June 14th, 2013, 06:50 PM
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Paul
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Check the cheap stuff first. Cap/rotor, plugs, timing. Do you still have your cats or did you remove them?

Welcome to Arlington.
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  #5  
Old June 14th, 2013, 07:24 PM
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You're right, you are really close. Before you waste a lot of time and money, change the oil and re-test it. You might be surprised how much difference it makes.

Another trick we used to do was creating a vacuum leak- more air=leaner mixture. If the idle got too high we cut every light, blower motor, defrost, etc on (not AC) and even put it in gear or slip the clutch just enough to bring it down.
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  #6  
Old June 14th, 2013, 08:01 PM
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Abraham Bell
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Go to a parts house and get some 44k fuel additive. Put it in with a 1/4 tank of fuel. Right before you need to ad fuel go get it rechecked. Change the oil too. This worked for me 8 times in Colorado in my Subaru and 4runner.
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  #7  
Old June 14th, 2013, 08:28 PM
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Robert Dassler
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While you're at it, you should look at the centrifugal (mechanical) advance mechanism in the distributor. Have seen a few stuck causing emissions failures.
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  #8  
Old June 14th, 2013, 09:06 PM
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This sounds like the results I had with my D1. Brought it in piping hot with a fresh oil change. That knocked it down. Dont let it idle in line either. Thatll load it up.
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  #9  
Old June 16th, 2013, 09:35 AM
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Ross Simpson
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Great success after a bottle of Lucas Oil Octane Booster, 10 gallons of 93 octane, and a few runs up and down Lee Highway to get the temps up.

I suppose this means I owe beer to more than a few of you, and will gladly pay up at the next HH; suppose it's time, after 3 years in the area...
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  #10  
Old November 22nd, 2013, 01:06 PM
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Russell
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Another data point from this month. This almost deserves its own thread.
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