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Have a 2009 Mazda CX-7 cylinder 3 misfire already change the coil pack last month and spark plugs ran fine after that now its reading cylinder 3 misfire again

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  • 146 Answers

Check to see that plug wire is fully seated on plug and coil pack..Then, pull plug to see if fouled due to not firing when pack was bad.

Posted on May 15, 2017

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 217 Answers

SOURCE: 1998 Cavalier No Spark in cylinders 1 & 4

ignition mod. grounds,pcm or timing belt could all be it but, I would have to look at timing first.

Posted on Jan 17, 2009

chuck943
  • 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

ministock48
  • 258 Answers

SOURCE: Ignition coil pack on Ranger 1999 misfire on #3

replace coil

Posted on Oct 23, 2009

  • 819 Answers

SOURCE: I have a 2002 TrailBlazer with the straight

did you replace only one spark plug? that can cause issues because of differences in resistances between cylinders. also, did the map code stay off after replacing
?

Posted on Feb 28, 2010

  • 59 Answers

SOURCE: My 2005 Chevy Equinox LT

Have you done a compression check? I had the same problem on an S-10 Chevy pick up. Found that # 3 cylinder had low compression due to a burnt exhaust valve. No more problems after having valve job done on the engine.

Posted on Feb 16, 2011

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I replaced spark plugs because of a misfire in cylinder 2 and it ran great no issues for two months now a misfire in cylinder 2 again what could be the cause?


Can be a failing coil pack if you can move the coil pack to a different cylinder and then see if the code changes if it moves to the cylinder you moved it to then replace the coil pack should take care of the issue

Oct 01, 2015 | 2007 Ford Focus 2.0

1 Answer

Initial start up the engine sounds like its running on 2 cylinders under powered intil the temp gauge reads normal ???? any body got the answer please


Cold starting misfires can often be caused by either tired high tension spark plug leads or ignition coil packs. If replacing leads, then replace with a full, new set. Coils can be changed individually, but it is often the case that if one has failed, then the others aren't far behind. Some cars have individual coil packs on each spark plug. Some cars have a single pack for all plugs and some have coil packs which may control two or more plugs.

To check for a misfire (ignition failure) follow these steps:

(Cold start) (Use a pair of insulated pliers)

1) Start the vehicle

2) When the vehicle starts misfiring, disconnect plug leads or coil pack connections one at a time. If the vehicle idles even more roughly, then that plug or pack should be considered fine.
Replug each connection before disconnecting the next one. Once you disconnect a plug lead or coil pack connection and find no difference in poor engine running, then you have likely found the offending cylinder. Check the spark plug condition, lead and/or coil condition and connections on that cylinder.

3) Replace components as necessary.

Oct 12, 2014 | Cars & Trucks

2 Answers

The engine light came on in my 2003 Honda civic LX. My mechanic stated code was misfiring on cylinder 3. He changed the coil pack and reset the engine light. The car still seems to misfire when it is...


If you pull the plug wire from the spark plug on cylinder 3, is there any oil, water, or antifreeze in there? Have you removed the plug to see what condition it is in? If it is black or oil-fouled, you should replace it, or better yet, the entire set of spark plugs. When the coil pack was replaced, was the plug wire replaced as well? I have seen a stuck fuel injector cause your problem before, because the cylinder does not get the right amount of fuel, running either too lean, or too rich.

Apr 21, 2017 | Cars & Trucks

1 Answer

Mazda 6, no pulse ( coming from ECM) on the 3 pin connector on the coil pack , misfire P0301


Follow this link http://www.6crew.com/forum/showthread.php?3911-DIY-EGR-Modification-Optimization. This will help you fix issue

Feb 02, 2013 | 2004 Mazda 6

2 Answers

I have a mazda mpv 2000 minivan.problem code p0301 misfire detected cylinder#1


I'd check #1 spark plug.
Usually a misfire code "fix" is a spark plug, spark plug wire, or a coil pack / distributor.
Keeping it simple...I'd go with the spark plug first and then look at the condition of the wires.

Hope this helps...

Aug 28, 2011 | 2005 Mazda MPV

2 Answers

Suv stalls between 45 and 65 mph, already changed plug, wires, coil, and ran a fuel injectiong cleaner! check engine light comes on and off, reads miss fire cyl 1, 3, 5


Spark plug wires will last 20 years in most cases
Spark plugs never fail to fire,they are replaced at 60,000 miles,
not over 3 years,regardless of milage.
Injector cleaner is useless and a waste of money.
How would 10 oz in a 15 gallon fuel tank fix anything
common sense.

Now you diagnose your drivability issue
Retrieve the code,if any, that set the check light,
proceed from there.

You stated a cylinder misfire,so you already know your problem
Coil pack, Coil -On-Plug,what ever you have on your vehicle.

The stalling is another issue,unless the misfire is so bad that it
spikes the computer,comes back on the TPS Sensor and the vehicle
goes into failsafe and shuts off. Still bad coil issues.

Nov 28, 2010 | 2008 Pontiac Torrent

2 Answers

Engine misfires


You didnt mention having changed the spark plug wires, so that is another item that could be culprit as well. As well, it could be a coil pack that is not working properly.

I cannot recall at the moment if that model year uses coil on plugs or if it uses coil packs. Either way, if it uses a coil on plug set up, take the one for the #3 cylinder and move it to say #4 or anyone of your choice and see if the misfire follows

If it uses coil packs, there is likely one coil pack that controls two cylinders. In that case just swap the coil pack with an adjacent one and see if the problem follows. Pay attention to where the spark plug wires go because it will be an issue if you get them mixed up. You just swap the coil packs around.

I would, however, start with the spark plug wires if you have not changed them already.

Dec 31, 2008 | 2003 Ford Explorer

4 Answers

HI I HAVE A 2001 MAZDA TRIBUTE AND THE CODES PO301 AND PO303 CAME UP IN THE DIAGNOSTIC REPORT. THE CAR TURNS OFF WHEN I WARM IT UP IN THE MORNING IN THE COLD AND AFTER THAT ITS FINE I ALREADY CHANGED THE...


cylinder 1 misfire and low compression. Plugs and wires changed plus new fuel injectors. The engines still misses and no one can find the cause. When put on the computer it read misfire cylinder 1.

Dec 31, 2008 | 2004 Mazda Tribute

1 Answer

Spark Plug Problem 2000 Ford Explorer


very well could be or the wiring going to the coil

Dec 13, 2008 | 2000 Ford Explorer

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