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Old 03-09-2008, 09:38 PM   #1
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02 sensor

I was work'n on the jeep today.Installed new u joint in front drive shaft.Well i just happened to look up and noticed there was a provision for an 02 sensor in the exhaust pipe about 2 foot down from the head.The hole was there and it was threaded but when i peeked up there to take a better look it was actually blocked off.(from the inside like it was done from the factory).Well i really didn't bother looking beyond that for an 02 sensor somewhere else but i kinda figured that it would have an 02 sensor seeing that it is a TBI unit and if it didn't have one and was supposed to it probably wouldn't run at all.Anybody else run into this or know what is going on.89 wrangler 2.5 TBI

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Old 03-09-2008, 10:04 PM   #2
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it would most likely run ok, back then it didn't affect the engine enough to stop from running, tell ya what, i got a buddies 90 w/ 4 banger here in my garage, its a tbi, i'll take a look tomorrow and see if it has one there.

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Old 03-09-2008, 10:50 PM   #3
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HMM,
sounds cool.The only thing im worried about is that i plan on getting it on the road this spring and i know it won't be long before the emmissions nazi's come and get me.I just want to make sure what's supposed to be there is there.and the fact that if it was supposed to have one and it didn't any car would trip an engine light which i have no problem with.

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Old 03-10-2008, 02:17 AM   #4
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Or does it not have a check engine light?Sorry,even all our old 1985 delivery trucks at work have engine lights.I'm guessing these have them too.Wouldn't be the first time i was wrong.
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Old 03-10-2008, 10:50 AM   #5
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to see if it even has a check engine light, look at the bulb check. when you turn the key to the on position, all warning bulbs light on dash for a couple seconds, it might be burned out. if the light goes on, then off after a couple seconds usually no codes are there. but obd 1 vehicles (pre 1996) are weird.
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Old 03-10-2008, 10:56 AM   #6
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i just looked on the computer at work here in my shop, the only oxygen sensor it shows is right at the bottom of the exhaust manifold. you should probably see it from under the hood, under the intake, right before the down pipe bolts to the exhaust manifold. that's all "all data" says, if i remember i'll look at the one in my driveway at home.
hope this helps
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Old 03-10-2008, 01:45 PM   #7
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Yeah,that's exactly where the hole is for the sensor.Right at the bottom of the manifold.Just there is nothing in it and blocked off internally.Maybe i'm more confused now..Yeah,let me know when ya get a chance.I'm in the process of ripping out interior and what not so it's no rush.
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Old 03-10-2008, 10:04 PM   #8
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hey, i took a look at this 90 4 banger, sure enough, there is an oxygen sensor there. did you do the bulb check yet?
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Old 03-11-2008, 05:26 AM   #9
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Yeah ,bulb must be toast i turned the key on and no light.What's really wierd is my buddy has an 85' blazer and he said his is the same way.A blocked off hole.Well i guess jeep ain't the only ones who do it.
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Old 03-11-2008, 08:55 AM   #10
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yeah, bulb is probably burned out, and a code might be there. maybe find someone that can scan it for cheap, or free, i know autozone does it out here for free, but that might only be obd 2 cars.
check your emissions regulations, out here cars could pass with codes on the dyno, then it went to only obd 2 cars being tested, and if there's a code it fails, if not, it passes basically.
jeeps are really easy to pass emissionis.
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Old 03-11-2008, 03:11 PM   #11
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Originally Posted by jpdocdave View Post
yeah, bulb is probably burned out, and a code might be there. maybe find someone that can scan it for cheap, or free, i know autozone does it out here for free, but that might only be obd 2 cars.
check your emissions regulations, out here cars could pass with codes on the dyno, then it went to only obd 2 cars being tested, and if there's a code it fails, if not, it passes basically.
jeeps are really easy to pass emissionis.
Well out here in MD if you have a check engine light illuminated you automatically fail.BUUUT seeing how it's an 89 it will have to hit the dyno so with the bulb being burned out i won't have to worry about a visual failure.AS far as i know they only scan obd2 vehicles.My buddy has a Snap on Soluus.I'll borrow his scanner and take a peek into it.Maybe this weekend.
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Old 03-11-2008, 09:09 PM   #12
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right on, out here they will fail if bulb is burned out, even if there's no codes.
but the fazed out obd 1, so pre 96 is no longer tested, so i can do whatever i want.
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Old 03-12-2008, 05:10 PM   #13
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Yeah bulbs were burned out.Almost all of them.Now emissions light stays on.Checked egr.It's bad.let's get to work.
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Old 03-12-2008, 11:34 PM   #14
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sounds like you replaced the warning bulbs, good job, you made it worse
now you got emissions lights on. what have you come up with on that o2 sensor, sounds like you need one, and the only way to make that happen is get a new manifold. time for a header. do you see the plug for it in the wiring harness?
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Old 03-13-2008, 05:27 AM   #15
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I'll have to check for the plug.But the more and more i talk to my buddy about his truck the more i don't think it's supposed to have one.But one can never be too sure.I think i should probably put a lift kit on it.That should make the light go out Well first i'll have to get an egr valve,The one that's on there is froze open.I'll start there and see what happens.
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Old 03-13-2008, 09:01 AM   #16
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definately, i think it takes a minimum of 4 inches to fix that light though

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