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Topic: New O2 sensor or catalytic converter?

in Forum: General Non-Vette Discussion


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New O2 sensor or catalytic converter? (1/2)
 10/20/08 12:20pm
Mashman
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Austin, TX - USA

Vette(s):
1972 convertible 350, white with blue interior


Joined: 3/19/2008
Posts: 18

My daughter drives a 98 Honda CRV with 110K miles, and recently the MIL came on. I have a ODBII reader, so I checked the code, and it said the problem was in the O2 sensor readings - so I thought OK needs a new catalytic converter.

So, I'm just about ready to have the cat replaced, and she tells me she was driving up hill, and the car started to rev high, and when she got to the top of the hill the car continued to rev very high for a little while.

Would this still indicate a problem with the catalytic converter, or would it be an O2 sensor problem. Would a bad catalytic convert cause the high revving? Do both O2 sensors get feed as input to the ECU or just the first one?

Thanks,
Matt
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New O2 sensor or catalytic converter? (2/2)
 10/20/08 1:05pm
Adams' AppleLifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas


Joined: 11/8/2003
Posts: 20126

Need more info on this one...
When you say it revs high, does that mean like the trans is slipping, or do you have to put your foot in it so far to get it to move that the trans downshifts, and causes the higher engine RPMs?
If you have to keep your foot in the accelerator to get the car moving at speed, then you're prolly looking at a cat converter issue, most likely it is stopped up, which would indeed set an O2 sensor code.
ALL of the O2 sensors report to the PCM. The PCM uses the info from the #1 an #2 sensors to determine the efficiency of the cat(s), as well as the air/fuel ratio.

If the car just seems to not have any power at higher RPMs, but runs a little better as you get off the accelerator, then I'd lean toward a bad cat...

IF the car runs fine all the time, without feeling "sluggish", going up that hill, or under full power, then you're looking at a different problem...

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