02 misfire on cylinder 3


Zak

10+ Year Member

Joined
Dec 30, 2012
Messages
6
Points
1,501
Vehicle Year
2002
Transmission
Manual
Thanks for looking.

Had a problem previously that was causing me starting problems however i replaced the battery and they all went away.

Basically, now I am having a bit of bucking and stuttering when I am accelerating. It idles fine it revs up fine when when it isn't in gear.

Got the code P0303 which was cylinder 3 misfire.

So far I replaced the spark plugs and the fuel filter (only because i had them on hand and ready to be done)

Otherwise I checked compression seemed ok, checked for vacuum leaks in the intake nadda i could find. I checked out the plug wires (which are only 6 months old if that) and they were good as well.

The only thing I can figure is the coil pack and I would test it for ohms but I've read other threads in other forums that sometimes the coil will appear perfectly fine according to a VOM but when a load is put on it, it craps out. Was hoping for any thoughts.

Thanks again.
 
Dirty injector in that cylinder perhaps? What was the readings from the compression test?
 
Yes, I would have a look at the injector first, you can even swap #3 and #2 to see if misfire follows injector, if you do swap disconnect the neg. battery terminal while doing the work(at least 5 min.) this will reset the CEL so you can see if misfire moves to another cylinder.

The tip of an injector sprays fuel into the intake then it is sucked into the cylinder, if the tip is dirty the fuel drips more than sprays, which is fine when there is no load, but under load the mixture is off because all the fuel is not sucked into the cylinder.
A really dirty injector can even limit fuel flow thru it.

Seafoam in the gas tank once a year can help keep injectors clean.
 

Sponsored Ad

TRS Events & Gatherings

Latest posts

Featured Rangers

Want to see your truck here? Share your photos and details in the forum.

TRS Latest Video

Official TRS Merchandise

Follow TRS On Instagram


Product Suggestions

Back
Top