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04 Dodge Van 3.3 liter,code PO 303 # 3 cyl misfire

Code PO 303 # 3 cyl misfire . Car has medium studder, comes and goes, runs better when warm,
does not kill at stops. Changed plugs, wires, vac hoses, fuel inj., plenum seals, compression 170#, checked inj. wiring on short harness, repaired vac hose on big box under dr. seat. Checked intake ...no leaks.Still has # 3 mis fire off and on. HELP or Salvage yard and sale on new used parts.

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  • Dodge Master
  • 12,467 Answers

Hook up a vacuum gauge .
Vacuum test 01

Posted on Aug 08, 2017

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6ya6ya
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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: 95 GMC Jimmy 4.3l W vin rough idle

My problem was solved when I repaired my 4 wd activation dash switch. The switch was contacting on 2WD & 4HI at the same time. The front differential activation is vacuum activated possibly creating a tug of war that didn't actually engage it but drained off vacuum from the engine? A theory at best but stumbbled across it because I knew the switch wasn't working properly I repaired it and low and behold rough idle disappeared and all is good for 3 weeks running.

Posted on Dec 10, 2008

nattsss
  • 119 Answers

SOURCE: car wont start

spray starting fluid in the air intake , if it fires you have a fuel problem , if it dont you have ign. trouble

Posted on Nov 10, 2009

SOURCE: 04' Ram 1500, bad mis-fire. cust repl s/plugs. no

You still have random misfires (PO300)
You most likely replaced those coils that set a code, and those were not the one bad offender,spiking the computer module.
Take a new coil and put in a cylinder,no change, replace old coil and move new one to next cylinder. You can do that once or twice a day, if you have nothing else to do. You need a 90 degree day, to really get that solved,unless you have an ignition oscilloscope.
Never had a bad spark plug in 45 years.

Posted on Sep 18, 2010

  • 11 Answers

SOURCE: 96 dodge intrepid cyl 6

I would check the sensor. If everything is working properly (as you have described), I would guess the sensor or computer module.

Posted on Jan 07, 2011

saailer
  • 1868 Answers

SOURCE: Truck has been sitting for almost a month in

Hello! Sounds as if you were successful..However, this is being listed as a trouble report...Is the F 150 running OK; Or does it still have a problem?....Guru...Saailer

Posted on Jan 15, 2011

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