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R
Rose Posted on Apr 16, 2014
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Misfire coil Po301 say miss fire we have change spark plugs and wires we check volts on ciol pack and it good. We are still get that code what to do.

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  • Anonymous May 08, 2014

    Have you fixed yet? If voltage to coil is good, uou have to check output to number 1 cylinder, using a spark tester, check for spark from #1 wire, if no spark inspect coil for cracks, most likely evident crack, but suspect coil. If you have spark, you will need to verify spark plug is good, highly recommended to use dealer spark plugs, if that is good, move forward with an engine compression test, but most likely coil is your issue or bad plug

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John Diehl

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  • Posted on May 07, 2014
John Diehl
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Coil pack voltage may be good but coil may not be putting out voltage check with spark checker.also fuel injector may be bad if all good do compresson test on cyl

5 Related Answers

emissionwiz

Marvin

  • 85242 Answers
  • Posted on Aug 08, 2012

SOURCE: 2001 ford taurus 3.0 v6 code p0306 misfire

Please go to this page for engine misfire causes.

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Anonymous

  • 160 Answers
  • Posted on Nov 29, 2008

SOURCE: miss firing

could be a wire crossed, or it's out of time. since you used motorcraft plugs, did you set them properly to the correct gap? replacing plugs without gapping them can cause the sluggishness, out of time can cause the mis-fires and rough running.

alicantecoli

Colin Stickland

  • 22516 Answers
  • Posted on Jun 21, 2009

SOURCE: coil pack

153624 is the firing order

Anonymous

  • 1 Answer
  • Posted on Jul 25, 2009

SOURCE: misfire

Check your cam. position sensor

Anonymous

  • 4 Answers
  • Posted on Dec 23, 2009

SOURCE: has two cylinders that are miss fireing i changed

check distributer cap
check rotory button under dist cap
change ALL wires
change ALL sparkplugs

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Why won't my car start?
P0300 multiple misfire
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Apr 25, 2015 • Cars & Trucks
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I have a miss fire on cylinder 2and 3 I have changed coil pack ,spark plugs and wires still have the missing in it did not make a difference what else can I do
Is the computer code coming up as a misfire or are you actually feeling the misfire when you drive? Make sure all the grounds for the coil packs and engine are solid and clean. Many times there is rust corrosion under the pack or the retaining screws etc, Low compression can feel like a misfire as well. If all items are OK do a compression check to verify its not an issue.
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Mar 03, 2015 • 1998 Toyota Sienna
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I have a 1996 crown vic i need to know these trouble codes po301 po304
PO300 Codes-- are cylinder misfires

PO301 thru PO308

Last # is the cylinder

Could be bad ignition coil for a cylinder
or a coil pack for that side,depending what
engine you have

#1 &#4 are at the front & back of the passenger
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You will need to provide details of who worked on it
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Codes aren't very good with COP Ignition but a complete
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Vacuum Leaks & other items can cause misfires & the codes
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Feb 14, 2013 • 1996 Ford Crown Victoria
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Engine miss firing installed new plugs still miss fires
You may get one bad spark plug in 50 years of driving

Does that answer your question?

You did not diagnose your problem, which
was a misfire.

Do you have codes PO301 thru PO306?

Ignition Coils cause misfires

Have to know the system your working on
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Mar 18, 2011 • 2001 Mazda Tribute
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My husband did a tune up on my car yesterday and now it wont start it will turn over like it wants to start but it wont he said that its miss firing we have bought 3 new coil packs and still will not start...
If your car is miss firing and your husband changed the coil packs,the wires leading from coil packs to sparkplugs must have got crossed.This will change car timing which will result in the car miss firing.He needs to go over wiring and correct problem for car to run right.You can go online to autozone.com and type in Info about car to get the correct wiring layout.Your problem isnt the new plugs n wires.Its the wiring layout.
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Feb 09, 2011 • Pontiac Grand Am Cars & Trucks
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3answers

CODES-PO301-PO303-PO316- CHANGED PLUGS & WIRES. STILL MISS ON START UP, GOES AWAY MOST OF THE TIME ABOVE 1000 R.P.M
P0301 - Cylinder 1 Misfire Detected.

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- Insufficient compression at cylinder #1
- Incorrect fuel pressure
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- Base engine
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Jan 17, 2011 • 2002 Mercury Sable
1helpful
1answer

MISFIRE ON CYLINDER 4 AND 6 WITH AN ENGINE LIGHT ON
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Also, check that the fuel injectors are firing on all 8 cylinders.

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I have a 1999 Expedition that had a miss on a cylinder, and it turned out to be a bad coil pack. You have 2 cylinders missing, so I would check each cylinder for good spark, or replace the coil packs as necessary to see if that resolves the problem.

Good luck on this repair.
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Dec 31, 2010 • 1997 Ford Expedition
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Cyl. 3 miss fire code po303
my money would be on the coil cover, especially if it had been a long time since the last tune up. it is certainly worth trying, as this is part of a routine tune up anyways. good luck!
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