boy&hisdogs
I'm Awesome
Actually never
#2 Misfire at Idle, Random/Multi While Driving
- Thread starter boy&hisdogs
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Actually never
I'd replace all four sensors--right after I dealt with the injectors. Pay attention to the wiring for the dead O2 sensor.
Remember, "O2 sensor sockets" are pretty-good for INSTALLING O2 sensors. They're crap for removing them if the sensor is old or seized. The slot down the side weakens the tool, when you put power to it, it spreads open and then ruins the hex wrenching surface on the sensor.
"Old and seized" is about the only kind of O2 sensor I seem to ever see. When I couldn't take it any longer, I bought a "special tool"; a 7/8 deep impact socket from Wright. This socket is "special" because the hex is broached deep inside, most impact sockets only have a shallow hex. Then the part of the socket that's not broached for the hex is too thick, there's no room for the O2 sensor body inside the socket.
The Wright socket is PERFECT for O2 sensor removal...except that you have to cut the wires on the sensor. Wright is a family-owned, made-in-USA tool company. Very recommended.
www.amazon.com/dp/B002VKBRCC/?coliid=I3QM27R5Q6EZ28&colid=2VLYZKC3HBBDO&psc=1&ref_=lv_ov_lig_dp_it
You'll probably need a rethreader tap for the holes those sensors screw into.
www.amazon.com/Lisle-12230-Oxygen-Sensor-Thread/dp/B000XETMW0/ref=sr_1_1
Remember, "O2 sensor sockets" are pretty-good for INSTALLING O2 sensors. They're crap for removing them if the sensor is old or seized. The slot down the side weakens the tool, when you put power to it, it spreads open and then ruins the hex wrenching surface on the sensor.
"Old and seized" is about the only kind of O2 sensor I seem to ever see. When I couldn't take it any longer, I bought a "special tool"; a 7/8 deep impact socket from Wright. This socket is "special" because the hex is broached deep inside, most impact sockets only have a shallow hex. Then the part of the socket that's not broached for the hex is too thick, there's no room for the O2 sensor body inside the socket.
The Wright socket is PERFECT for O2 sensor removal...except that you have to cut the wires on the sensor. Wright is a family-owned, made-in-USA tool company. Very recommended.
www.amazon.com/dp/B002VKBRCC/?coliid=I3QM27R5Q6EZ28&colid=2VLYZKC3HBBDO&psc=1&ref_=lv_ov_lig_dp_it
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You'll probably need a rethreader tap for the holes those sensors screw into.
www.amazon.com/Lisle-12230-Oxygen-Sensor-Thread/dp/B000XETMW0/ref=sr_1_1
xc_hide_links_from_guests_guests_error_hide_media
boy&hisdogs
I'm Awesome
Thanks for the heads up, I like that thread chaser.
I thought that the downstream sensors were supposed to be flat becuase the air is "clean" after the cat. Or were you talking about a different one?
They're not THAT flat.
Mike Mat
Newbie
I've got the same problem (1997 K1500 305CI 210,000mi). Can't seem to figure it out. Before reading this post, I was sure it was distributor/timing related as replacing the cap and rotor seemed to help - or at least prolonged the gaps of running well in between misfire codes.
stutaeng
I'm Awesome
A way to check to see if O2 sensors are non-responsive is to to induce a lean or rich condition. Spray some carb cleaner on the intake. You should see some sort of response on all 4 sensors. Or unhook a large vacuum hose and the O2 sensors should see a response due to the lean condition. I've done this before. Takes very little time and costs almost nothing. You can almost eliminate O2 sensors suspicion by this simple test.
I guess this doesn't tell you if they are partially working, just that they are completely dead. Or maybe you can compare the waveform on a similar, "known good" O2 sensor waveform if you have another truck handy?
I guess this doesn't tell you if they are partially working, just that they are completely dead. Or maybe you can compare the waveform on a similar, "known good" O2 sensor waveform if you have another truck handy?
Archaic2021
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Any luck with your issue...I got a missfire on cyl2 thats driving me crazy
boy&hisdogs
I'm Awesome
Nothing yet. I got a new O2 sensor to try out and see if it does anything. I'm about ready to give up and take it to a pro to have it diagnosed.
boy&hisdogs
I'm Awesome
After having to soak it in penetrant for several days the bad O2 sensor is finally out. I replaced both downstream sensors just to be safe. The one is still putting out lower voltages than the other, but at least the curve responds to RPM changes appropriately. I also noticed a big chunk of my post-cat exhaust gasket missing. It sounded like it leaked but I didn't know it was that bad!
So with two new 02 sensors and an exhaust leak taken care of it runs a bit better but is still misfiring.
So with two new 02 sensors and an exhaust leak taken care of it runs a bit better but is still misfiring.
Which cylinder(s) are misfiring?
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