Question about 2003 Ford Thunderbird

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Reasons for cylinder misfires

On exceleration engine stumbles above 2000 rpm returns to normal. Engine analyzer picked cylinder #7 misfire. Changer coil with no results. changed all spark plugs also no help.

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Dan Jacobs

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  • Ford Master
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Ford coil on plug systems are multi strike ignition (spark) under 1300 rpm then go to single strike a single cylinder misfire can be created by several things . #1 Test engine compression on a cranking engine compression it should be around 150 lbs but if gauge reads different COMPARE to other cylinders that work fine #2 check engine running compression this will be around 120 lbs then rev over 2000 rpm and check pressure drop again COMPARE to other cylinders that work fine. any drop would indicate valve train problems. #3 All internal engine is fine then external problems are present vacuum leaks and or fuel injection volume is low.

Posted on Jul 23, 2014

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chuck943

Chuck Martin

  • 783 Answers

SOURCE: engine code p0307 cylinder #7 misfire

It could be carbon deposits on valve seats keeping valves from totally closing. You can try getting you a can of motorcraft PM3 top end engine cleaner and get engine up to operating temp then remove one of the small vacuum lines from the intake and draw the contents of the can slowly into the engine.After you have drawn in the contents shut engine off and let it soak for about 45 minutes then crank it back up and let it run until it clears. Now it will smoke like a forrest fire while you are doing this so don't be alarmed,just tell the neighbors you are spraying for mosqitos.This may cure the problem. If not you may be looking at a valve job.
This can be verified with a compression test if this is what is causing it.

Posted on Feb 05, 2009

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alicantecoli

Colin Stickland

  • 22485 Answers

SOURCE: My 2002 Ford Ranger Edge V-6 is misfiring.

havent a clue here ,one cylinder now another missing ,only one thing comes to mind here and thats the coil pack ,check the voltage across the battery with engine running at 1500rpm and if its higher than 15.5 volts of their abouts then the alternator regulator is playing up and this would cause problems with the coil pack or the ECU ,also the radio could blow and lots of bulbs.Other that this i would need to get my greasy hands on it and give the magic hammer treatment

Posted on Jan 02, 2010

ZJLimited

ZJ Limited

  • 17970 Answers

SOURCE: diagram of spark plug

Check this for 4.6 or 5.4 sizes engine...

2004 Ford Expedition 4.6 liter V-8 VIN "W"

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2004 Ford Expedition 5.4 liter SOHC V-8 VIN "L"

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Hope this help (remember comment and rated this).

Posted on May 05, 2010

Testimonial: "thanks for the info. I worked like a charm"

Anonymous

  • 120 Answers

SOURCE: I am having the same

When is the last time the car has had a timing belt could it be bad??

Posted on Jan 16, 2011

emissionwiz

Marvin

  • 85239 Answers

SOURCE: 2001 ford taurus 3.0 v6 code p0306 misfire

Please go to this page for engine misfire causes.

Posted on Aug 08, 2012

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I have a 2002 Lesabre with the 3.8 engine. Mine started running really bad. The code was random engine misfiring. I changed plugs, wires and a few other parts with no success. It ended up being the ignition control module. It sits under the coils on my car. Cost around $150. Mine went bad at around 110,000 miles.

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Have a 2000 buick park ave. after changing plugs and wires check engine light still on. computer code says misfiring number 5. What part needs changing? Im thinking the coil?


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Again, to be sure you can switch coil paks around to make sure it is a coil pak. When you switch the bad with a good, the misfire will follow the coil pak, if it does not it is the module.]

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havent a clue here ,one cylinder now another missing ,only one thing comes to mind here and thats the coil pack ,check the voltage across the battery with engine running at 1500rpm and if its higher than 15.5 volts of their abouts then the alternator regulator is playing up and this would cause problems with the coil pack or the ECU ,also the radio could blow and lots of bulbs.Other that this i would need to get my greasy hands on it and give the magic hammer treatment

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P0307 Code - Cylinder #7 Misfire Technical Description Cylinder #7 Misfire Detected
What does that mean? A P0307 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #7.
copyscape.gif SymptomsSymptoms may include:
  • the engine may be harder to start
  • the engine may stumble / stumble, and/or hesitate
  • other symptoms may also be present
Causes A code P0307 may mean that one or more of the following has happened:
  • Faulty spark plug or wire
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Running out of fuel
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  • Defective computer
Possible Solutions If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
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