Close
My truck when it rains or is damp outside is running rough gives a 304 miss fire
1999 Ford Ranger

My truck when it rains or is damp outside is running rough gives a 304 miss fire

(1999 Ford Ranger)
my 99 ranger 2.5 engine gives a 304 miss fire code when its raining or damp outside. I replaced both coil packs wires and plugs,this did not fix the problem.
Ask a Question
1 answer & 3 comments
Popular Answer
on April 12, 2015
Since # 4 is at the rear of engine where water can run in between hood and cowl, check for moisture at that cylinder...Check rubber seal under hood at cowl.. Spray ignition sealer on all ignition componets.. or related componets!
Sign in to reply
on April 12, 2015
I also get a 0455 code sometimes vacumeleak.I can't find leak.
on April 12, 2015
That's an EVAP system leak.. Should not be affected by moisture! .. Have EVAP system checked, may need smoke test. Good luck, I'm out of ammo!
on April 12, 2015
OK thanks.
Oil Leak Diagnosis
$88 - $111 Learn More
on April 12, 2015
Since # 4 is at the rear of engine where water can run in between hood and cowl, check for moisture at that cylinder...Check rubber seal under hood at cowl.. Spray ignition sealer on all ignition componets.. or related componets!
Sign in to reply
on April 12, 2015
I also get a 0455 code sometimes vacumeleak.I can't find leak.
on April 12, 2015
That's an EVAP system leak.. Should not be affected by moisture! .. Have EVAP system checked, may need smoke test. Good luck, I'm out of ammo!
on April 12, 2015
OK thanks.

Similar Questions

View answers to similar questions from RepairPal's community of auto experts and enthusiasts.
2007 hyundai sonata v6 175k car will not crank car will not start. just put in a new starter. all i get when turning...
2005 ford f150 6 .engine spit and sputters but wont start when warm,after pumping the gas and trying a few times it...