Is there a way to check for bad 02's?

gt93mustang · 03-16-2001, 12:24 PM

... other than the check engine light. My car has started running VERY rich at idle, but has a miss and lean pop under load or partial acceleration. I was just wondering if I could check with a volt meter or if there was some other brilliant way to check them without just pulling them out and getting a new set. Thanks in advance.

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MAC equal length headers, MAC Off-Road H-Pipe, Flowmaster mufflers, 373's, March ram-air kit, underdrive pulleys, 73mm MAF, 75mm TB, Saleen Intake (ported), Edelbrock 6037 heads (ported, polished, 3 angle valve-job 255CFM @.500), 1.6 FMS RR's, Wolverine 1087 Cam, 24lb injectors, MSD 6AL, Subframe connectors, Griggs Adustable Lower Control Arms, Lakewood 50/50 shocks, SSM Upper Control Arms... and probably some more in there I forgot

Rick 91GT · 03-16-2001, 12:38 PM

Hey 93 how are you doing, didn't see oyu last night, get that meter yet?

I know this isn't the cheapest method but it will also help in the future. I have a A/F meter and if the sensor goes static/bad they tend to run either dead rich or dead lean. After the install I found one of my O2's ran rich on the gauge you will see it because it doesn't dance around, stays at the high or low end. If you want to do this I can send you the instructions on the install of the toggle so you can read LH and RH from one gauge. Maybe I'll see you in the chat if your there, were trailering my car down my parents tonight so we can install the cage tomorrow but I'll check the boards later..

Rick

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My Ride Check Out My Site 91GT, Holley SysteMAX II Kit-Heads 2.02" x 1.60",Full MAC exhaust 1-5/8" Long tubes, 2-1/2" O.R H-Pipe, 2 1/2" cat back, 12" K&N Filter, RNH PERFORMANCE Ram Air, Ron Davis Radiator, Full Suspension,3:73's, Welds, Best on new motor-12.60 @ 108, no traction 1.98

ed1371 · 03-16-2001, 02:31 PM

I read somewhere that you can check an O2 with a voltimeter..

a good one is supposed to read 8 ohms (not 100% sure though)

gt93mustang · 03-16-2001, 08:04 PM

Hey Rick. Actually, I do have an A/F guage on my car already. I have it mounted on my A-pilar from when I had a blower. It shows my car running stoic all the time, but I question how accurate it is. When I got my car dynoed, when it would miss, the A/F would spike lean for a split second and return to normal.

Oh, I was on last night, I don't remember what time.. I think it was after 9:00. There was a decent turnout.

poopstang · 03-16-2001, 09:06 PM

they're heated so if you to turn the key on(for about 5 min) you can check the heaters by grabb'n the o2s with your hand as long as everything is cold!

93lx · 03-16-2001, 09:08 PM

not to question it but the symptons you described sound like a bad mass air meter i had similar problem and found the wires on the sensor were bad, just my two cents good luck other wise.

gt93mustang · 03-17-2001, 12:24 PM

93lx- Actually, I thought the same thing. So I changed out my meter with a friends and still no change. Maybe I should have unplugged the battery or something, but it still ran poorly. Also, while I was at the dyno, we changed my C&L with a Pro-M that they had lying around, and it still had a crappy miss. This has been going on for quite a while now and no one seems to know the answer.

Thanks again for all the input.

03-16-2001, 12:24 PM	#1
gt93mustang Registered Member Join Date: Feb 1999 Location: Kennesaw, Georgia, USA Posts: 252	Is there a way to check for bad 02's? ... other than the check engine light. My car has started running VERY rich at idle, but has a miss and lean pop under load or partial acceleration. I was just wondering if I could check with a volt meter or if there was some other brilliant way to check them without just pulling them out and getting a new set. Thanks in advance. ------------------ MAC equal length headers, MAC Off-Road H-Pipe, Flowmaster mufflers, 373's, March ram-air kit, underdrive pulleys, 73mm MAF, 75mm TB, Saleen Intake (ported), Edelbrock 6037 heads (ported, polished, 3 angle valve-job 255CFM @.500), 1.6 FMS RR's, Wolverine 1087 Cam, 24lb injectors, MSD 6AL, Subframe connectors, Griggs Adustable Lower Control Arms, Lakewood 50/50 shocks, SSM Upper Control Arms... and probably some more in there I forgot

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03-16-2001, 12:38 PM	#2
Rick 91GT Procharged! Join Date: May 1999 Location: Hanover, PA Posts: 1,539	Hey 93 how are you doing, didn't see oyu last night, get that meter yet? I know this isn't the cheapest method but it will also help in the future. I have a A/F meter and if the sensor goes static/bad they tend to run either dead rich or dead lean. After the install I found one of my O2's ran rich on the gauge you will see it because it doesn't dance around, stays at the high or low end. If you want to do this I can send you the instructions on the install of the toggle so you can read LH and RH from one gauge. Maybe I'll see you in the chat if your there, were trailering my car down my parents tonight so we can install the cage tomorrow but I'll check the boards later.. Rick ------------------ My Ride Check Out My Site 91GT, Holley SysteMAX II Kit-Heads 2.02" x 1.60",Full MAC exhaust 1-5/8" Long tubes, 2-1/2" O.R H-Pipe, 2 1/2" cat back, 12" K&N Filter, RNH PERFORMANCE Ram Air, Ron Davis Radiator, Full Suspension,3:73's, Welds, Best on new motor-12.60 @ 108, no traction 1.98

03-16-2001, 02:31 PM	#3
ed1371 Registered Member Join Date: Feb 2000 Posts: 469	I read somewhere that you can check an O2 with a voltimeter.. a good one is supposed to read 8 ohms (not 100% sure though)

03-16-2001, 08:04 PM	#4
gt93mustang Registered Member Join Date: Feb 1999 Location: Kennesaw, Georgia, USA Posts: 252	Hey Rick. Actually, I do have an A/F guage on my car already. I have it mounted on my A-pilar from when I had a blower. It shows my car running stoic all the time, but I question how accurate it is. When I got my car dynoed, when it would miss, the A/F would spike lean for a split second and return to normal. Oh, I was on last night, I don't remember what time.. I think it was after 9:00. There was a decent turnout.

03-16-2001, 09:06 PM	#5
poopstang Registered Member Join Date: Mar 2001 Location: palmbayFL Posts: 184	they're heated so if you to turn the key on(for about 5 min) you can check the heaters by grabb'n the o2s with your hand as long as everything is cold!

03-16-2001, 09:08 PM	#6
93lx Registered Member Join Date: Nov 1998 Location: mass Posts: 35	not to question it but the symptons you described sound like a bad mass air meter i had similar problem and found the wires on the sensor were bad, just my two cents good luck other wise.

03-17-2001, 12:24 PM	#7
gt93mustang Registered Member Join Date: Feb 1999 Location: Kennesaw, Georgia, USA Posts: 252	93lx- Actually, I thought the same thing. So I changed out my meter with a friends and still no change. Maybe I should have unplugged the battery or something, but it still ran poorly. Also, while I was at the dyno, we changed my C&L with a Pro-M that they had lying around, and it still had a crappy miss. This has been going on for quite a while now and no one seems to know the answer. Thanks again for all the input.