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Old 06-28-2021, 09:48 AM   #1
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Chevy 454 bad O2 sensors code

I have a Fleetwood southwind 32v. While on a trip I had the check engine light come on and it started losing power. Once I stopped shut it off, then started it back up it would run fine for a while. Had a mechanic pull codes and it said o2 sensor. He replace it and off we went. But it did it again. This is the 3rd time. The motor loses power won’t rev over 2 grand and acts like it needs to be cleaned out. Once I turn it off and back on it works fine until I hit a grade. Then it all starts over. Any help would be great
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Old 06-28-2021, 09:51 AM   #2
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When is the last time the fuel filter was replaced? Did your mechanic test the fuel pressure?
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Old 06-28-2021, 10:40 AM   #3
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Pull codes. If the O2 sensor is toast again you have a fuel problem, like a leaking injector, MAF sensor or something driving the mixture rich.

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Old 06-28-2021, 10:49 AM   #4
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I may be wrong, but I believe you have two O2 sensors, one on each manifold/exhaust. Did he replace both?
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Old 06-28-2021, 04:36 PM   #5
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What yr is the coach. With TBI Gm used 1 oxygen sensor with OBDI ECM's up till 95 or 96 when they change to OBD II. If you have 1 oxygen sensor , you can unplug it and try it out. With the sensor unplugged the engine it will run in open loop mode using only the engine temperature and throttle position sensor.

It could also be the temperature sensor for the ECM or a leaking fuel injector or MAP sensor.
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Old 06-28-2021, 06:24 PM   #6
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Folks read the OP's original posting, especially this part: " But it did it again. This is the 3rd time. The motor loses power won’t rev over 2 grand and acts like it needs to be cleaned out. Once I turn it off and back on it works fine until I hit a grade. Then it all starts over. "


That is the classic symptom description of a clogged fuel filter or weak fuel pump. There are two sets of codes for the O2 sensor on GM products. One for running over rich and another for running too lean, which is what I think the OP is experiencing in this situation.
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Old 06-28-2021, 08:56 PM   #7
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yes fuel filter cheapest.. but check fuel pressure before and sfter.. my bet is bad fuel pump.. also check fuel pressure regulator on fuel rail.. there is a cheap 1/8 in vac line there and thay leak..you can buy after market fuel pressure gauges that mt on dash.. good luck and let us know what you find.. chevy put same eng as all their trucks, so big parts store c2500 or c3500 same yr will save you a lot..
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Old 06-28-2021, 09:07 PM   #8
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Thank you everyone I will pass this onto my guy
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Old 07-18-2021, 09:54 PM   #9
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Put the year and engine detail in signature.
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Old 07-19-2021, 11:12 AM   #10
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Similar issue on my 1995 454 with TBI. I traced it down to a bad Throttle position sensor. when It happened on mine I disconnected the battery for 30 seconds to reset the ECM and it drove normally for final 200 miles home. I found the problem by checking the voltage across the TPS. IIRC it should read around .5 volt in the idle position an increase smoothly ( no spikes up or down) to about 4.5-5 volts wide open. Buy an AC Delco TPS not an off- brand. I had to do the job twice because I tried to save $6

Another possible and known gremlin is the Temp sender to the ECM. This one is usually screwed into the thermostat housing on later models.
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Old 07-19-2021, 02:35 PM   #11
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You really need to look at the signal output for the O2 sensor, not just the codes, the codes could mean a bad sensor, or it could be mean an out of range value caused by an exhaust leak, etc.
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Old 07-19-2021, 11:25 PM   #12
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Quote:
Originally Posted by RickNC View Post
Similar issue on my 1995 454 with TBI. I traced it down to a bad Throttle position sensor. when It happened on mine I disconnected the battery for 30 seconds to reset the ECM and it drove normally for final 200 miles home. I found the problem by checking the voltage across the TPS. IIRC it should read around .5 volt in the idle position an increase smoothly ( no spikes up or down) to about 4.5-5 volts wide open. Buy an AC Delco TPS not an off- brand. I had to do the job twice because I tried to save $6

Another possible and known gremlin is the Temp sender to the ECM. This one is usually screwed into the thermostat housing on later models.
Indeed Rick. Stick with AC Delco or Delphi brand parts when replacing anything. When it comes to plugs...AC Delco, Autolite or NGK coppers for the TBI engines. The CTS is on the fan side of the intake manifold just below the T-stat housing on TBI engines.
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