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Unread 03-19-2013, 07:51 PM   #16
Jbwardfamily
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Yes, I have a volt meter.

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Unread 03-19-2013, 09:03 PM   #17
SLO_Ken
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Quote:
Originally Posted by Jbwardfamily View Post
Ok. Lots of great info here. I took a closer look and I have a 4-wire sensor. All of the wires are in perfect shape. Is there any way the sensor went bad or should I prepare to send the ECM back to Howell? I hate to put $60 into a new sensor. I have never seen one go bad that fast.
The 4 wires on the sensor should be white-white-grey-black. The two white wires are for the heater, the black is the sensor signal, and the grey is the sensor reference.

If you put 12V across the two white wires, the tip of the sensor should get hot.

Here is a link to a YouTube video showing how to check the sensor. Connect your volt meter across the black and grey wires.
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Unread 03-19-2013, 09:04 PM   #18
86cj74.2L
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Figure out which two O2 sensors wires are for the sensor and see what it reads at idle with engine up to temp.

Their are two matching color pairs. One for the heater and one for sensor.
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Unread 03-19-2013, 09:12 PM   #19
kjonesie
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Ok I'm confused.....I have the Howell "off Road" system on my 4.2 with a header, and the O2 sensor is at the collector. Does that mean it is reading wrong?
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Unread 03-19-2013, 10:19 PM   #20
86cj74.2L
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Quote:
Originally Posted by kjonesie
Ok I'm confused.....I have the Howell "off Road" system on my 4.2 with a header, and the O2 sensor is at the collector. Does that mean it is reading wrong?
No as long as its a heated sensor your ok. Aka it has 3 or 4 wires.
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Unread 03-20-2013, 06:46 AM   #21
walkerhoundvm
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I think that's what he means - the "off road" system doesn't come with a heated sensor, only the CA kit does AFAIK.
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Unread 03-20-2013, 08:37 AM   #22
INowUnderstand
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I have seen a Toyota truck go through 2 sets of O2 sensors brand new. 3 set lasted years. Don't have a clue why the first ones where garbage. Any part can be crap even if it is new
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Unread 03-20-2013, 09:32 AM   #23
SLO_Ken
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Quote:
Originally Posted by walkerhoundvm View Post
I think that's what he means - the "off road" system doesn't come with a heated sensor, only the CA kit does AFAIK.
It's my understanding that the difference between the "California" and "off-road" versions, at least for the 4.2, are that the Ca kit adds a heated O2 sensor, a VSS, a CEL, and an emissions-friendly PROM in the ECU.
That said, the OP said his "Non-California" kit for his 304 came with a heated sensor, then confirmed this by verifying that his sensor has 4 wires.
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Unread 03-20-2013, 10:20 AM   #24
RamblingCJ
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I purchased the off road kit and was charged for adding the heated sensor due to my header. That is why it's good to order directly from them and they will tailor it to your needs. They add the heated sensor if you mention that you are running a header.
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Unread 03-25-2013, 07:10 PM   #25
Jbwardfamily
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Is it possible that running premium gas could cause problems with the O2 sensor? I started back on low-test and it isn't happening as much.
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Unread 07-29-2013, 01:08 PM   #26
SLO_Ken
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Quote:
Originally Posted by CSP View Post
There has to be a stock application that's a replacement. It's garbage that Howell won't give the original application out so you can get replacement parts. What if you're stuck far from home and can't wait for them to ship you their $60 part?

I would dig around in the EFI forums at www.binderplanet.com and see if you can find a part number for the two wire, heated sensor.
I just had to replace my O2 sensor as well. I found that the stock application is a mid-late '90s Chevy 4.3L. I told the counter guy at Napa it was going in a '95 Blazer.

Also, Bosch p/n 15703. $29 on Amazon.


or ACDelco AFS75
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