![]() Also is your exhaust tight before or near your O2 sensor, a leak could cause funny numbers also. If the problem stays on the left side also make sure you don't have a vacuum leak (TB gasket, cracked injector O-ring etc.) that could be part of the problem. If not, you could have a bad wire, or connector. Then I'd swap the O2's to see if the problem of the lazy response follows that left O2. 128 is where your should be shooting for and you have 108 (rich) on the left and 153 (lean) on the right at times.įirst of all, I'd reset the computer and see if the open loop situation goes away, your numbers should be locked at 128. Your BLMs are all over the place and are seriously split. As soon as you go into closed loop the left O2 is lazy and is not alternating like the right is. OK, even in open loop your right BLMs are telling you that there is a problem, they should be reading 128 and yours is 135-141. I found some NGK replacements at Summit Racing for around $35 a piece, maybe I should give them a try. Well, mine aren't that old but they were sitting out for quite a while when I did my swap and again when I did my upgrade. ![]() ![]() Im sure the fact that they're used and have been exposed to many heat cycles helps this corrosion process to happen faster." I guess they stay in good shape so long as their still mounted in the pipe because the pipe itself acts as a barrier from the condensation that would otherwise kill the sensor. He also said that here in humid FL that this can happen with the O2's removed for more than a few hours or so. A good friend of mine (a GM tech) said that because they werent in the pipe, the part inside the sheild (sensor part) had excess moisture exposure and corroded, causing the failure. When I put everything back together they didnt work anymore. I removed mine while doing a head gasket repair and left them sitting on the bench. My personal experience can attest to that. ![]() Also, since the car's been sitting a while, if the O2's have been sitting un-installed they may have already gone bad. "If they are fairly old, it would be a good idea to replace them. I just found a post over at LT1tech where someone talks about O2 sensors. ![]()
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