91z 2 8

Im pretty sure my o2 sensors bad because i just replaced the plugs twice? i think and their bad again, so im pretty sure its my o2 sensor. Is there any other way to tell if its bad, the car also bucks/misses at very low throttle once its warm. So if anyone knows why it dose that that would be awsome. also its not throwing a code about the sensor i just is doin the same things my moms car did when her sensor was bad. im also getting really bad gas milage. thanks in advance. Nate

TADailyDriver

iTrader: (8)

pull the o2 sensor and shake it, if it makes a rattling noise when you do, its toast.

CamaroRider

I agree. On my 1995 Concorde I pulled mine and found that they had a => very small <= rattling noise. I replaced both of them (my car has only two) and my SES light no longer goes off and on as I drive. This problem did NOT leave any problem codes. I just took a wild guess because the car ran fine (even passed E-check with the SES light acting up) and the O2 sensors were about due for a change anyway.

If you have bad mileage it might be something that CAUSES the O2 sensors to start reporting a problem.

Check all of your vacuum hoses for starts. Make sure they are in place and not cracked (leaking) at the connections.

pandin

The best O2 sensors run 100,000 miles some replacements only 30,000, this is off the spec sheets.

Yes, think of them as spark plugs, if the plugs are not lasting the O2 will foul up also (think about oil or carbon).

91z 2 8

thats what i was thinking did it the car only has 65k miles so im thinking just because it sat for a year it went out. im gonna replace it when i get the cash, their only like 20 bucks right? lol another stupid one my car only has 1 right?? jk i know

also the car never throws a code tho i just comes on after a while cause of the cat not being their

Joelfke

where is the O2 sensor located exactly??

89Formula_350

Older camaros and birds should only have one ... on either the passenger or drivers side exhaust manifold. Later 4th gen and the most modern cars of today have 4 ... or maybe even more ... on both the passenger and drivers side exhaust manifold both before the cat and after the cat.

Joelfke

so its definately ON the manifold?

CamaroRider

On my 1989 305 FI Vin E (TBI) it is on the driver side manifold. If you climb under the car near the driver's side front wheel and look up it sticking out and easily seen.

89Formula_350

Well, on my 89 firebird it is. I'm not sure if the setup changed so much between 89 and 91 or if it is different between camaros and birds. But yeah, I would put my money on passenger side exhaust manifold.

Joelfke

fantastic....my cars getting a random check engine light while randomly driving and im pushing 200k so i think its time to change that and probrably other sensors

THANKS

91z 2 8

mines on the drivers one

SLP-GTA

iTrader: (1)

91z 2 8 did this fix your problem?? I just started to have the same problem, car idles ruff once in closed loop. It runs fine going down the road and when it in open loop, but at idle acts like it cammed

Also, I'm not throwing any codes..I have a autoXray, what should I look for??