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Missing and backfire through air cleaner

Tiny
AXLE62249
  • MEMBER
  • 1999 FORD RANGER
  • 3.0L
  • V6
  • 2WD
  • AUTOMATIC
  • 140,000 MILES
No codes in ECM. Back fires and misses. When driving gets worse the longer you drive. Had at a shop could not figure it out. I installed new plugs wires coil pack and EGR. Cleaned throttle body mass air flow, and idle control valve. No improvement.
Sunday, April 23rd, 2017 AT 2:44 PM

3 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check for a vacuum leak then pull the valve covers off and check to see if broken springs, push rods or rockers. If you can start truck and take off plug wire one at a time to see if you can locate which cylinder is doing it. If it is going through air cleaner it is an intake valve.
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Sunday, April 23rd, 2017 AT 4:06 PM
Tiny
AXLE62249
  • MEMBER
  • 2 POSTS
Truck fires right up. Idles around 1000 rpm. Small exhaust leak on drivers side at manifold. Just noticed fan turns a little stiff.
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Sunday, April 23rd, 2017 AT 5:19 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
This has noting to do with a backfire, try what I said in first reply
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Monday, April 24th, 2017 AT 6:11 AM

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