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Engine misfiring bad?

Tiny
MRSZ
  • MEMBER
  • 1 POST
  • 1997 DODGE CARAVAN
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 126,000 MILES
Hi, my check engine light on my van says we have a port 4 misfire. We replaced all 6 spark plugs and wires and it continued to misfire. We the replaced the coil pack thinking that could be the problem. It has improved some but still isn't right. When we're driving, it sounds like the engine is backfiring (sounds almost like a shot gun) between 1500 and 2500 RPM. After that, it's fine. It also seems to chug when we get it around 50 MPH or so. Wondering, could the spark plugs have gotten damaged by the bad coil pack or is it probably a computer problem? I've also had people tell me it could be a lifter going bad or the catalytic converter. I don't know much of either of them though. Please help!

*** The fuel pump assembly was replaced about 2 months ago. There was also a compression test done and it came back fine.
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Monday, July 27th, 2020 AT 9:50 AM (Merged)
Tiny
CH112063
  • MECHANIC
  • 1,320 POSTS
I do not believe that the misfire code can come from any reasson except electrically,
or electronically. So if you have already put a new Mopar plug and wire, and it is lean or rich, pull out that plug, if you test compression and it is normal only the injector, or a cranksensor may cause this. You could switch two and see, as long as it is not low compression. Do you understand? Which one(engine)?
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Monday, July 27th, 2020 AT 9:50 AM (Merged)
Tiny
COLUMBUSUSATT
  • MEMBER
  • 1 POST
  • 1997 DODGE CARAVAN
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 120,000 MILES
Hi !
Dodge caravan 2.4 16 valve engine skips
how can this happen/ cause
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Monday, July 27th, 2020 AT 9:50 AM (Merged)
Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
Check for tuneup
plugs wires air and fuel filter check coil
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Monday, July 27th, 2020 AT 9:50 AM (Merged)
Tiny
SABRINA1986
  • MEMBER
  • 1 POST
  • 1997 DODGE CARAVAN
  • 6 CYL
  • FWD
  • AUTOMATIC
I got a 1997 dodgecaravan it has I miss fire what would be the cause
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Monday, July 27th, 2020 AT 9:50 AM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Go to this link: https://www.2carpros.com/articles/engine-misfires-or-runs-rough
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Monday, July 27th, 2020 AT 9:50 AM (Merged)
Tiny
MHPAUTOS
  • MECHANIC
  • 31,938 POSTS
Low compressions, faulty spark plugs, leads coil dist cap if not DIF, vacuum leaks, all will have to be checked.
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Monday, July 27th, 2020 AT 9:50 AM (Merged)
Tiny
KCLANDRUM
  • MEMBER
  • 1 POST
  • 1997 DODGE CARAVAN
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 183,000 MILES
Between 40 to 50 mile per hour, the engine misfires
constantly.
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Monday, July 27th, 2020 AT 9:51 AM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Hello, how long since a tune-up? Use a gage check fuel pressure. Any codes?
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Monday, July 27th, 2020 AT 9:51 AM (Merged)

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