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Unread 07-16-2010, 02:06 AM   #16
bmxrules39
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How do I determine where the backfire is coming from?
I don't get any codes, I wish I had one.

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Unread 07-16-2010, 12:09 PM   #17
bruteboy
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a backfire out the exhaust will be a loud bang like a shotgun.
a backfire in the intake will be a muffled pop from the front of the vehicle.
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Unread 08-18-2010, 09:12 PM   #18
bmxrules39
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I'm going to bump this thread with a new question.
I've been kind of dealing with this problem, but today I was up wheeling and got stuck, shut off the jeep, hooked up the winch, and the thing wouldn't start back up, a couple of guys got me unstuck and level, then she fired right back up.

I'm thinking that it could be the CPS, that's about the only sensor I haven't had to replace in the last year
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Unread 08-19-2010, 12:00 AM   #19
bmxrules39
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Ok I got a new cps and it didn't chang anything, now my gas gauge is jumping everywhere, and I have a very rough idle, is it possible I have another bad pump?
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Unread 08-19-2010, 12:01 AM   #20
bmxrules39
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Quote:
Originally Posted by bruteboy View Post
a backfire out the exhaust will be a loud bang like a shotgun.
a backfire in the intake will be a muffled pop from the front of the vehicle.
The back fire is coming from the intake
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Unread 08-19-2010, 02:16 PM   #21
bmxrules39
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Nobody has any ideas?
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Unread 08-19-2010, 03:15 PM   #22
BlueFlame
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Sounds to me like low voltage.
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Unread 08-19-2010, 03:16 PM   #23
bmxrules39
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low voltage where?
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Unread 08-19-2010, 09:40 PM   #24
bmxrules39
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Today I tested my coil it was fine.

I'm still stumped on what it could be, maybe the cam shaft position sensor?
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Unread 08-20-2010, 04:47 PM   #25
bmxrules39
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Tested the pressure in my fuel rail its only at 22 psi at idle, if I hand throttle it, it drops
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Unread 08-20-2010, 11:39 PM   #26
chris142
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Quote:
Originally Posted by bmxrules39 View Post
The back fire is coming from the intake
Lean and not flooding
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Unread 08-20-2010, 11:39 PM   #27
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Quote:
Originally Posted by bmxrules39 View Post
Tested the pressure in my fuel rail its only at 22 psi at idle, if I hand throttle it, it drops
Spec is 49psi I believe.
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Unread 08-21-2010, 12:32 PM   #28
bmxrules39
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Thanks chris142, I swapped out the fuel pump and everything is back to normal
My PSI is back to 49
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Unread 08-21-2010, 02:07 PM   #29
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Quote:
Originally Posted by bmxrules39 View Post
Today I tested my coil it was fine.
How did you do that? Just curious for doing something similar ...
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Unread 08-21-2010, 02:29 PM   #30
bmxrules39
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If you have an ohm meter, you will unplug the coil at both ends, set the ohm meter on k or 20k, put a lead where the plug wire connects and the other lead on one of the prongs on the other side (it doesn't matter which one, do both) The ohm meter should read between 10.5 and 15, I believe it was. Mine was 13. I got the specs from autozone, you should just be able to take it in there and they can do this for you.
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