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Old 07-16-2019, 09:19 PM   #1
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O2 Sensor Locations

I have a 1998 Winnebago Adventurer, P30 chassis, 7.4l Chevy 454. I知 trying to figure out how many and where the O2 sensors are located. I知 not getting a code, but failed emissions test and want to replace everything I can before I try again! Replaced spark plugs and fuel filter. Owned it 7 years and haven稚 replaced the sensors yet. Also, what is the recommended gap on the spark plugs. I知 seeing 45 and 60.
Thanks!
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Old 07-16-2019, 09:30 PM   #2
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Welcome to iRV2.

I know the gap was reduced on the 8.1 engines , not sure about the 7.4.

I would ask , what section of the emissions testing was out of range?
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Old 07-17-2019, 12:19 PM   #3
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Hi ! Welcome to IRV2! We're sure glad you joined the gang!

Sorry I can't help with that! Have fun and keep her between the ditches!

Good luck, happy trails, and God bless!
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Old 07-17-2019, 04:35 PM   #4
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I’m with skip. You have no code so you don’t know what to fix without asking.
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Old 07-18-2019, 06:32 AM   #5
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And the rig is fuel injected?
If yes, then check that it has an OBDII port to the side of the steering column. The port looks like a parallelogram. Sometimes it has a cover on it.
Buy an ELM based inexpensive scan tool. Load TorquePro app on your Android smartphone. Get a decent diagnostician to take a look with you.

The remove the radiator cap, slide a new RV underneath it and tighten the cap. That should fix it.

If the o2 was required and it isn't switching states, then you would have a Check Engine light on and there would be a code that the ELM will identify. I assume you don't have a Check Engine light on so o2 is probably healthy.

You could be burning oil which is causing the failed emissions. Any number of things.
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Old 07-18-2019, 07:08 AM   #6
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1998 was the early stages of OBD II. You could have 1 to 4 oxygen sensors . There would be 1 located near the outlet on each exhaust manifold , 1 just before the CAT , and 1 just after the CAT. You could only have 1 sensor and it would be on the exhaust manifold. You will have to just get underneath and check. I would start with the temperature sender for the ECM . If you have a MAF sensor , it just may require cleaning.
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Old 07-18-2019, 08:03 AM   #7
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Quote:
Originally Posted by Bedford View Post
I have a 1998 Winnebago Adventurer, P30 chassis, 7.4l Chevy 454. I知 trying to figure out how many and where the O2 sensors are located. I知 not getting a code, but failed emissions test and want to replace everything I can before I try again! Replaced spark plugs and fuel filter. Owned it 7 years and haven稚 replaced the sensors yet. Also, what is the recommended gap on the spark plugs. I知 seeing 45 and 60.
Thanks!
You have 4 O2 sensors and the reason there is two sparkplug gaps is two different plugs are speced. Iridium Plugs gap at .045 Platinum at .060.
Throwing parts at a problem you don't know the source of is silly and counter productive. Find out what specific part of the emissions test failed and then do some research from there. The 454 vortec was used in several models of GM trucks and there is a ton of information out there if you take the time to research it. The most valuable part of the experience is learning how to diagnose and repair these older motorhomes yourself. Because the reality is that very few shops are willing to work on older motorhomes and fewer still know what they are doing.
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