1997 5.9 Backfiring out of exhaust after new cat.

Tiny
64STACEY
  • MEMBER
  • 1997 DODGE RAM
Engine Mechanical problem
1997 Dodge Ram V8 5.9 Four Wheel Drive Automatic

Replaced Cat two years ago. Last week went to start the truck it would not start, it would turn over but not start. The cat was clogged again, replaced it and new muffler. The truck started drove for 12 miles started backfiring through the exhaust, just would not go. I pulled over reset the comp and it drove another 10 miles almost home then started the same thing real bad. The truck always has a anti freeze smell to it but it doesnt run hot at all stays right around 180, not that it has anything to do with my problem. Can anyone point me in the right direction to start. Will a scanner pick up a code if the cel is not on? I cant afford to start replacing things if there not bad and so many sensors not sure where to start, any help would be so appreciated.
Thanks
Stacey
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Tuesday, November 2nd, 2010 AT 12:56 PM

5 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
How many miles are on the engine? Does it backfire while accellerating or on deceleration?

As far as the check engine light, chances are you will get no codes if it is off. It doesn't hurt to try.

Let me know.
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Thursday, November 4th, 2010 AT 10:40 PM
Tiny
64STACEY
  • MEMBER
There are 145k miles on the truck, it ran like a top before this. It backfires on both, give it gas it backfires, let off it backfires runs rough as all git- out !
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Friday, November 5th, 2010 AT 12:39 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Is it through the exhaust or the intake? Also, have you checked for vacuum leaks? Often times a vacuum leak will cause a backfire. Also, let me know if it does it all the time and consistantly. It could be a burnt valve.
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Friday, November 5th, 2010 AT 12:53 PM
Tiny
64STACEY
  • MEMBER
Well the thing is it ran for 12 miles like a charm, then all at once started backfiring, missing, just rough and bad. Then when I reset the comp ran fine again for another 10, 12 miles then started the whole thing over again. I think it is just backfiring out the exhaust, husband is at work, so I am answering these questions best I can. The truck has always ran great.
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Friday, November 5th, 2010 AT 1:11 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
How did you reset the computer? Did you use a scanner? Was there a trouble code? If so, what was it?
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Saturday, November 6th, 2010 AT 1:20 AM

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