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Unread 01-24-2014, 12:33 PM   #1
PR1AWRet
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1995 XJ Cherokee 
 
Join Date: Mar 2006
Location: San Diego/Imperial Beach
Posts: 819
Failing Smog Again

Failed back at the beginning of the month for high speed NOX. (there is anther thread that got over taken).
Failed Smog again today.

My catalytic converter was trashed/rattled and 1/2 the substrait was missing. The O2 sensor stayed at .4 volts (replaced 2 years ago with a NTK). Replaced the cat with a Walker (P/N80905) California compliant one. Replaced the O2 sensor with a Bosch. Replaced the Acell spark plugs, they were at .065 (?), cap and rotor. (does not have an Acell coil)Went with BWD cap and rotor and Champion copper plus plugs (set at .035).

95 XJ, 4.0L, auto, 4x4, OBD1



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Unread 02-20-2014, 11:25 PM   #2
sdmoose429
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2000 TJ Wrangler 
 
Join Date: Feb 2009
Location: Good Ole' Sandy Eggo, CA
Posts: 988
Quote:
Originally Posted by PR1AWRet
Failed back at the beginning of the month for high speed NOX. (there is anther thread that got over taken). Failed Smog again today. My catalytic converter was trashed/rattled and 1/2 the substrait was missing. The O2 sensor stayed at .4 volts (replaced 2 years ago with a NTK). Replaced the cat with a Walker (P/N80905) California compliant one. Replaced the O2 sensor with a Bosch. Replaced the Acell spark plugs, they were at .065 (?), cap and rotor. (does not have an Acell coil)Went with BWD cap and rotor and Champion copper plus plugs (set at .035). 95 XJ, 4.0L, auto, 4x4, OBD1
Can't read VIR attachment.
Has head been shaved? What temp thermostat?
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Unread 02-25-2014, 09:18 AM   #3
mattman998
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2002 TJ Wrangler 
 
Join Date: Jun 2012
Location: San Diego, CA
Posts: 129
I replaced an O2 sensor with a Bosch and it s**t the bed right away. NTK fixed it right up. Use whatever is OEM and I'll bet you have better luck, as long as it's O2 related anyway...
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Unread 02-25-2014, 09:38 AM   #4
brokenyoujoint
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1997 TJ Wrangler 
 
Join Date: Dec 2008
Location: San Diego, CA
Posts: 827
seems quite a few people are having issues with Bosch. When part x costs 40.00 and the dealer want's 70.00 it's easy to stray towards the 40.00, but when that 40.00 product fails on you in 6 months and you then get the dealer one, that wasn't a very smart purchase. Fuel stuff and electrical stuff (for me) is dealer only .
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Unread 02-26-2014, 03:47 AM   #5
sdmoose429
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Location: Good Ole' Sandy Eggo, CA
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The Bosch sensor is the OE one. In 15 years in the smog biz here in SD, I have seen time and again, where the OE (Bosch) is the only one that can properly control the fuel mixture.
I have also seen brand new sensors be biased and simply installing another unit, exactly the same, brought the fuel control right wheee it should be. It almost seems like they go bad just sitting on the shelf.
Also, just the act of removing and reinstalling one can change the emissions Doesn't make any sense, I know, but we see it all the time.
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Unread 02-26-2014, 09:11 AM   #6
mattman998
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Are you sure about that? The Bosch that I got looks completely different than the OE sensor. Like it was an upgraded design or something. I went on rockauto, where it labels the NTK as the OEM part, ordered that and it looked identical to what I was taking out.
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Unread 02-26-2014, 12:31 PM   #7
brokenyoujoint
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1997 TJ Wrangler 
 
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Location: San Diego, CA
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if you want a dealer one, go to the dealer..... Bad from stock is very possible and over torque/bad install can ruin it as well. I was lucky enough when I needed one that I found a guy parting out his jeep and I pulled all the sensors and threw them in my jeep. Jeep was a bad rollover and w/low miles.
Also be sure to use an anti seize to do yourself a favor next time around.
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Unread 02-26-2014, 05:34 PM   #8
sdmoose429
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Quote:
Originally Posted by brokenyoujoint
if you want a dealer one, go to the dealer..... Bad from stock is very possible and over torque/bad install can ruin it as well. I was lucky enough when I needed one that I found a guy parting out his jeep and I pulled all the sensors and threw them in my jeep. Jeep was a bad rollover and w/low miles. Also be sure to use an anti seize to do yourself a favor next time around.
Good point, Kevin. Use the copper-filled, conductive kind. The sensors I've seen lately already have it on the threads. And, yeah, DO NOT OVERTIHTEN THEM. The copper paste actually gets squeezed out of the thread
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Unread 02-26-2014, 05:37 PM   #9
sdmoose429
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Quote:
Originally Posted by mattman998
Are you sure about that? The Bosch that I got looks completely different than the OE sensor. Like it was an upgraded design or something. I went on rockauto, where it labels the NTK as the OEM part, ordered that and it looked identical to what I was taking out.
Good to know NTK worked for you. They are very good sensors. I use them a lot.
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