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Changed plugs and wires, not all cylinder firing

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Check to make sure all of your connections are on good and tight between the plug wires and spark plugs. Also check the spark plugs on the cylinders that are not firing. Make sure they are gapped appropriately (if they are the ones you have to gap) and also check to see how the tips look. If they are covered in oil then that means that one of your piston rings is cracked and is letting oil in your cylinder. You might also want to check your distributor cap for any cracks and such to make sure that it is sending spark to all of your spark plug wires.

Posted on May 03, 2009

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Hello my name thomas and i am a first year apprentice mechanic.

by wires do you mean spark plug leads, if yes double check there is a good connection with the spark plug leads. if there is a good connection you may have a faulty lead.

hope i was able to help

Posted on Jul 22, 2008

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RaidX
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SOURCE: Honda Odyssey 2005; after changing new spark

Use owners manual to see if your spacing on the spark plugs are correct and the torque for each spark plug must be exact to prevent mis-firing. the owners manual will contain all the information you need to know about doing basic maintenance on the car.

Posted on Jul 21, 2010

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SOURCE: 2007 Pt Cruiser I Changed

I'm going to give this some thought and try to get back with you tomorrow....a cousin back home in Missouri is a MoPar nut and an excellent mechanic in his own right.

Posted on Mar 17, 2011

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SOURCE: 2004 ford escape cylinder 6

I suspect the PCM has a bad driver from the misfire. Need a PCM. Get numbers off PCM and find on ebay cheap.

Just one cyl misfire DTC code?

Posted on Jul 05, 2011

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Have 1994 toy. truck with v6, when choke goes off the engine misses


Hey 94 TOY...

When did the problem start? Before you changed the wires and plugs? Or did it start, AFTER you changed the wires and plugs? Did the problem remain the same BEFORE & AFTER you made the changes?

1 - If the TOY ran fair to Okay before you did the work, then you may have done something wrong when you made the cahages. Check for correct plugs and firing order. Check for cross wiring. With engine runing pull one plug wire off each plug one at a time. Each pulled plug wire will slow down the engine. When you pull a plug wire that doesn't react and does not make any change ON or OFF that cylinder Plug.
Then that cylinder is not firing.

2 - Check for spark at that wire. If you do-not have Spark there, But the other wires do... the wire going to that cylinder is BAD.

3 - If you have the correct firing order and spark at all cylinders then the cylinder that did-not change the speed of engine has a compresstion problem. Bad valves, Piston or rings are bad... Major engine work and Major repair bill for the repair job.... GOOD LUCK....

Oct 15, 2012 | 1994 Toyota Pickup

2 Answers

#1 and #4 are not firing I changed the coil pack and still no change any ideas


You said you changed the coil pack and the wires but didn't mention the plugs. Try moving one of the plugs to a different cylinder and see if the miss follows it. It could also be the ignition module. (the thing the coil packs mount to.)

Oct 05, 2012 | 1993 Chevrolet Lumina

1 Answer

I have a sebring 2004 v6 2.7 which is misfiring. put it a new coil and changed plug on cylinder that doesnt fire still no spark. im getting power all th way to the plug tested with volt meter.it reads 14...


Invalid test. When plug fires, the wire shoots around 40,000volts. When not firing, there is no current in the wire.
Try switching the misfiring plug wire with another that is firing. Switch them both at the plug and at the coil tower. If that was a bad plug wire, the misfire will now be on the cylinder where you put the suspect wire. This will confirm a bad plugwire.
Good luck.

Nov 25, 2011 | 2004 Chrysler Sebring

1 Answer

Cylinder 1 and 2 misfire have changed plugs coils ignition module and whole fuel rail and injectors no help pulled upper and lower intakes see nothing realy wrong please help me my name is john hodson from...


Try switching those plug wires with ones that are firing, if the miss fire transfers to those two plugs, then it's the plug wires.
I say that cause you didn't mention anything about changing plug wires. You changed eveything else.
You also didn't mention what engine you have. If cylinders 1 and 2 are adjacent to each other, take a compression test on them, if it's lower than about 150 to 160 psi then the head gasket is blown between those two cylinders.

Aug 31, 2011 | Chevrolet Monte Carlo Cars & Trucks

1 Answer

Engine light on. went to auto parts store, they diagnosed number 2 or 3 cylinder not firing. prior to this i changed plugs and wires. then i changed the coil. the engine light went off and the gas economy...


Hello mikew564.The first diagnosis was number 2 or 3 cylinder not firing. Once you changed the coil, the check engine light went off. When the light came back on again, did you get it diagnosed again to find out if the problem was the same?... 2 or 3 cylinder not firing????

First of all, there is NO extra wire/ground on the coil/ignition wiring (see images below). The spark plugs and ignition plug wiring can be checked for arcing, corrosion, resistance and can be checked for cracks in the insulators or worn electrodes (and spark gap) by a competent mechanic.
If you are having the same issue (2 - 3 misfire), there are several techniques for eliminating the plug wires or spark plugs. Spray water on the plug wires to see if they are arcing. Swap plugs from cylinders 2 & 3 with cylinders 1 & 4. If you still have a 2-3 misfire, check/inspect/examine the coil connector pins & coil harness to the coil(s) themselves.

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Aug 27, 2011 | 2004 Hyundai Elantra

2 Answers

2007 Pt Cruiser I Changed spark plugs 2 weeks ago Bosch Platinum +4, car is non turbo 2.4 ltr engine. within 1 day engine light on cylinder 1 miss fire, read on the net changed plugs to Champion RE14MC...


remove the plug from the #1 cylinder, and install it into the #2 cylinder , and put plug from # 2 clyinder in to #1 plug hole, connect plug wires, and start up vehichle, and if computer shows misfire on # 2 cylinder , then you have a bad plug, possibly porcelin insulator could have a hair line crack in it, hope that this information has helped you.

Mar 17, 2011 | Chrysler PT Cruiser Cars & Trucks

1 Answer

Firing Order diagram for 2006 Ford Explorer


Hope this helps. The ignition coil:
  • changes low-voltage pulses from the PCM to high-voltage pulses.
  • fires 2 spark plugs simultaneously.
  • has 3 transformers.
    • One transformer fires the spark plugs for cylinders 1 and 5
    • One transformer fires the spark plugs for cylinders 2 and 6
    • One transformer fires the spark plugs for cylinders 3 and 4
Spark plug wires:
  • carry high-voltage pulses from the ignition coil to the spark plugs.
The spark plugs:
  • change high-voltage pulses to spark at the gap, which ignites the fuel and air mixture.
The firing order is 1-4-2-5-3-6.

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Jun 06, 2010 | 2006 Ford Explorer

2 Answers

Code po304 #4 cylinder mis fire


ck if you have spark at the coil for that cylinder. check the plug wire closely. if it has spark at the coil, then replace all the spark plug wires.

Oct 12, 2009 | 2000 Cadillac DeVille

2 Answers

Miss fire in cylinder 1 and 4


Problem could be as simple as a vacuum leak around either of those cylinders. A vacuum leak can create a lean fuel mixure condition resulting in a miss fire. One thing to rememeber is that depending on the style of ignition in use. The opposing cylinder's spark plug and wires act as the return path for the unused voltage from the coils firing which is why you are having seemingly unrelated misfires. If either has a problem then the symptoms are shown in both cylinders.

Apr 23, 2009 | 2000 Ford Mustang

1 Answer

1994 dodge 1500 wont start after changed plug wires


Make sure your firing order is correct. Also if you replaced cap and rotor make sure coil wire isnt loose. If you cant find the firing order its stamped on your intake manifold, cylinder numbers should also be stamped above each cylinder on the manifold.

Mar 27, 2009 | 2001 Dodge Ram 1500 Truck 2WD

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