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Unread 07-01-2013, 05:41 PM   #31
C2tuck
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Ok...so I just got home. Crawled under the jeep and guess what...no cat. So now I'm really stumped. My o2 sensor is directly behind the manifold, it zig zags over to the passenger side, straight thru to the muffler. Which is kinda funny seeing that it just passed inspection. You can see where the car was taken out and a straight pipe welded in place of it.

Thoughts? I'm about to check the timing. I'll let you know what I find out.

Guess mike_breaker_5 owes me 10 bucks! Haha

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Unread 07-01-2013, 05:55 PM   #32
C2tuck
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Timing is steady at 8 degrees
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Unread 07-01-2013, 10:07 PM   #33
C2tuck
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Anyone? Still think its the exhaust or timing??
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Unread 07-01-2013, 10:55 PM   #34
mike_breaker_5
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i'll have to get the cash in your account friday on payday. i would still check the muffler for a plug. find out what is rattling in the exhaust. the cat may have let loose and plugged the muffler.
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Unread 07-02-2013, 05:41 AM   #35
C2tuck
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No. Don't worry about it brother. Just messin'eith you. Really want to know what the hell is causing this. Need to make it my DD for a few weeks while I repaint my truck...
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Unread 07-02-2013, 07:53 AM   #36
laybackman
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Quote:
Originally Posted by C2tuck View Post
Ok...so I just got home. Crawled under the jeep and guess what...no cat. So now I'm really stumped. My o2 sensor is directly behind the manifold, it zig zags over to the passenger side, straight thru to the muffler. Which is kinda funny seeing that it just passed inspection. You can see where the car was taken out and a straight pipe welded in place of it.

Thoughts? I'm about to check the timing. I'll let you know what I find out.

Guess mike_breaker_5 owes me 10 bucks! Haha
What do you mean the O2 goes straight thru to the muffler?????? It should be in your exhaust downpipe

If the O2 sensor wires are being subjected to too much heat that might cause your problem also. Insulate or move the wiring to see if that makes your YJ run better.
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Unread 07-02-2013, 08:15 AM   #37
mike_breaker_5
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the o2 sensor could just be all around fried. that could cause backfiring and a loss of all power.
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Unread 07-02-2013, 08:51 AM   #38
laybackman
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Originally Posted by mike_breaker_5 View Post
the o2 sensor could just be all around fried. that could cause backfiring and a loss of all power.
Agreed! He can check it using a volt meter. They are 60.00 or more so it is not a cheap part to test by replacing it.

Buy the good one with the correct plug not the cheap Chinese knock offs that aren't worth spit.
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Unread 07-02-2013, 09:06 AM   #39
mike_breaker_5
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i use the bosch ones, i have always had good luck with them.
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Unread 07-02-2013, 09:28 AM   #40
laybackman
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i use the bosch ones, i have always had good luck with them.
I forgot to mention the best brand! Thanks for filling in the blanks for this foggy brained old fart!!!!
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Unread 07-02-2013, 09:41 AM   #41
C2tuck
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No no. I meant the manifold. O2 sensor. Then pipe all the way to the muffler. Sorry for the confusion.

The po of this jeep didn't drive it much. Actually got it from a friend. Could it be some kind of clog in the muffler? Since it was sitting could it be a wasp nest or something in there? Just going out in a limb here. Gonna replace the exhaust anyways. Should I put a cat on or leave it off?

If o2 sensor is bad wouldn't my CEL be on?
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Unread 07-02-2013, 10:21 AM   #42
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o2's can fail within spec and never set off a cel. Even when they do fail out of spec the wont always set off a hard code. that keeps the light lite up. I periodically use the key trick to check for codes that wont set the light off.
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Unread 07-02-2013, 10:33 AM   #43
laybackman
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Quote:
Originally Posted by C2tuck View Post
No no. I meant the manifold. O2 sensor. Then pipe all the way to the muffler. Sorry for the confusion.

The po of this jeep didn't drive it much. Actually got it from a friend. Could it be some kind of clog in the muffler? Since it was sitting could it be a wasp nest or something in there? Just going out in a limb here. Gonna replace the exhaust anyways. Should I put a cat on or leave it off?

If o2 sensor is bad wouldn't my CEL be on?
Listen to me real good! I have 65 candles going on my next stinkin' birthday cake AND I have a wife that thinks I am an idiot....I don't need the extra stress........
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Unread 07-02-2013, 11:50 AM   #44
C2tuck
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Haha...

What about a cam sensor or crank sensor? Busy of mine said that's what he thought they were...opinions??
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Unread 07-02-2013, 11:54 AM   #45
laybackman
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Haha...

What about a cam sensor or crank sensor? Busy of mine said that's what he thought they were...opinions??
If either of them or the MAP sensor were bad it would not run well, or at all, either cold or hot since they are vital for real time fuel/air/timing adjustments IIRC.
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