Backfiring... - Page 3 - JeepForum.com
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post #31 of 232 Old 07-01-2013, 04:41 PM Thread Starter
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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post #32 of 232 Old 07-01-2013, 04:55 PM Thread Starter
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Timing is steady at 8 degrees
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post #33 of 232 Old 07-01-2013, 09:07 PM Thread Starter
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Anyone? Still think its the exhaust or timing??
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post #34 of 232 Old 07-01-2013, 09:55 PM
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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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post #35 of 232 Old 07-02-2013, 04:41 AM Thread Starter
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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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post #36 of 232 Old 07-02-2013, 06:53 AM
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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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post #37 of 232 Old 07-02-2013, 07:15 AM
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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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post #38 of 232 Old 07-02-2013, 07:51 AM
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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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post #39 of 232 Old 07-02-2013, 08:06 AM
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i use the bosch ones, i have always had good luck with them.

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post #40 of 232 Old 07-02-2013, 08:28 AM
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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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post #41 of 232 Old 07-02-2013, 08:41 AM Thread Starter
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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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post #42 of 232 Old 07-02-2013, 09:21 AM
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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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post #43 of 232 Old 07-02-2013, 09:33 AM
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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........

Do you know what was good about the good old days? I wasn't good, And I wasn't old!

Senators and Congressman should wear uniforms like NASCAR drivers so we could identify their corporate sponsors....
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post #44 of 232 Old 07-02-2013, 10:50 AM Thread Starter
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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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post #45 of 232 Old 07-02-2013, 10:54 AM
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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.

Do you know what was good about the good old days? I wasn't good, And I wasn't old!

Senators and Congressman should wear uniforms like NASCAR drivers so we could identify their corporate sponsors....
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