Random engine misfire code?

Tiny
DWCROSSETT
  • MEMBER
  • 2000 FORD RANGER
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 77,000 MILES
Running really rough, engine light. Code says missing on cylinder 4. New plugs and wires. Works for about 5 miles starts to run rough again with engine light.

Going to run a compression check tonight. Possibly look at injectors and switch 1 and 4 to see what happens.

Anything else I'm missing. Missing cylinder error is pretty vague.
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Wednesday, July 29th, 2020 AT 11:06 AM (Merged)
Tiny
BLACKOP555
  • EXPERT
Sounds like you got it well figured out.

Have you checked for spark on that cylinder?
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Wednesday, July 29th, 2020 AT 11:06 AM (Merged)
Tiny
JSTOKER06
  • MEMBER
  • 2000 FORD RANGER
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 24,600 MILES
I pulled the truck up to the gate and all of a sudden it started misfiring. Took it to autozone to have it tested and he said that cylinder 6 was mis firing. Replaced spark plugs and still have the same problem. I do not believe that it is the coil or the wires and we tested to make sure that all the cylinders had fire and they do.
Any help would be much appericiated. Also on the highway only misses at low rpm.
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Wednesday, July 29th, 2020 AT 11:06 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • EXPERT
If you replaced the plug, the wire is good, the coil is good, and you are getting a hot spark at the correct time, there is one of two problems. First could be low compression in that cylender, which is hard to believe because of the low mileage. Or, you could have a plugged or damaged injector. Have you checked to see if the injector is getting a pulse?
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Wednesday, July 29th, 2020 AT 11:06 AM (Merged)
Tiny
AL514
  • EXPERT
  • 2001 FORD RANGER
  • 4.0L
  • V6
  • 2WD
  • AUTOMATIC
  • 180,000 MILES
Here's a good one for ya guys. So I can't get this truck to set a code, at all. It has a misfire due to what looks like a vacuum leak, but (here's the weird part) we unplugged the MAF, unplugged an injector, plus the constant miss and this thing won't set any codes. Yes I have communication, live data stream. MIL comes on at KOEO. I haven't checked the ECM powers and grounds yet, but I wanted to see if anyone has seen this before. I'm not a ford guy. But I need to find out what smoked this ECM before I call it. Possibly a shorted sensor. I haven't check the 5v ref yet either. Thanks guys
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Saturday, October 10th, 2020 AT 10:23 AM (Merged)
Tiny
KEN L
  • ADMIN
Hey Al,

What burns up ECM's are shorted fuel injector or ignition coils. I would test each before plugging in a rebuilt/new ECM. Check power and grounds as well. Also unplug the 02 sensors I have seen the heater short to ground. Let us know.
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Saturday, October 10th, 2020 AT 10:23 AM (Merged)
Tiny
AL514
  • EXPERT
Hey Ken. I actually don't think it's a bad ECM. It seems from a little research that fords have a lot of criteria that needs to be met for a mil. I've found misfire data for the #3 cylinder. But no hard faults. There's a pid #53 that counts misfires. But it's hard to find. So Im assuming the #3 isn't a dead miss yet. But I can feel it in the truck. But I will check all those you've listed for shorts to ground first.
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Saturday, October 10th, 2020 AT 10:23 AM (Merged)
Tiny
KEN L
  • ADMIN
It could be the injector shorting let me know.
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Saturday, October 10th, 2020 AT 10:23 AM (Merged)

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