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2000 ranger 4.0 lack of power and showing misfire on plug 3. plugs gapped at 56 and missing through out the range of speeds

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Bad spark plug wires (very common on these) or bad ignition module/coil.

Posted on Apr 25, 2015


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My jeep liberty threw a code:P0303 Cyl #3 Misfire

#3 cylinder is either 3rd from fron on front to back engine or third from left on sideways engine (assuming 4 cylinder engine) misfire could be fouled or bad plug, injector fouled, bad coil, bad wire, bad sensor...lots of things can cause this. I would have all codes cleared and then see if it comes back and if it does what other codes show up as well.

Jul 20, 2016 | Jeep Cars & Trucks

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2000 toyota 4 runner. Has no power. Sounds like it isn'tt getting the gas. changed fuel filter,plugs

Bad gas or diesel in tank???
getting misfiring on all cylinders and coils won't ever fail at same time. Usually only 1 at a time.
don't ever replace the fuel filter. only if it has lack of power on highway speeds.

Apr 04, 2014 | 2000 Toyota 4Runner

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P0304 misfire 4

I think it's best to rely on something authenticate than on various people's limited knowledge.. I've bought a manual and it was very helpful.. Must try Best Manuals

Oct 31, 2017 | Ford Ranger Cars & Trucks

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Missing on number 3

Did you set the gap right on the spark plugs? Also double and triple check the wiring diagram for plug wires, because may have gotten one crossed. I would also check to see if having any vacuum leaks or broken vacuum lines since replacing wires, sometimes they become brittle and break.

Aug 12, 2012 | 2000 Ford Ranger SuperCab

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Misfires. I have a 1998 Camry 2.2 with 200K miles. The

Hi, my first recommendation would be to take the plugs out and visually inspect each one and check to make sure they are properly gapped, if they look fouled at all i would replace them without hesitation. try throwing a set of NGK plugs in the car to fix the misfires. other than that you may want to look at the wires. good luck joe

May 22, 2010 | 1998 Toyota Camry

1 Answer

My 1999 crown victoria is misfiring at high speeds even after i changed all coils and put the right gapped spark plugs in i had it checked on a scanner and it said cylinder 5 was misfiring so they took the...

not only did the problem switch cylinders, it switched banks. cylinders 5&6 are on the drivers side and 4 is on the passenger side. i would recheck all wires to make sure you have the correctly installed.

cylinder locaton
2 8
dr. 8 7 6 5 7 4 coil

pass. 4 3 2 1 3 5
6 1 coil

Mar 18, 2010 | 1999 Ford Crown Victoria

1 Answer


Try putting a bottle of injector cleaner through it and see if it clears up at all. It may be that you have a little carbon build up. If that does'nt help you may need new spark plugs and/or wires. The coil may be on its way out too, but I would replace the cheap stuff first. If you end up replacing the spark plugs make sure they are gapped properly before installing them. They rarely come from the store gapped to the specification that is in your operators manual. Hope this helps. God bless

Oct 23, 2009 | 2000 Ford Ranger SuperCab

1 Answer

2000 Daewoo Lanos intermittant misfire trouble code

check fuel filter and check fuel for water or contaminents
then check fuel pressure with gauge also while driving
may have pin hole in leads - spray water with salt solution over HT leads while engine running and then rev to see or here spark jump(missfire)
recheck spark plugs - did you crack any on installation/removal/installation?
what are the codes and description if stored?
what is engine live data parameters like do they look normal (right specs for range/operation)?

Jul 27, 2009 | 2000 Daewoo Lanos

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1998 ford ranger number four spark plug misfiring. code P0304

yes try new plugs and wires. if it still happens change the coil to

Sep 16, 2008 | 1998 Ford Ranger SuperCab

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