I am having rough idle, causing cylinder 3 miss.

CERODRIGUEZ40

MEMBER
2004 DODGE CARAVAN
116,000 MILES

I am having rough idle, causing cylinder 3 miss fire (p0303). Ran through 2 tanks of seafoam I have rotated and replaced the spark plugs and wires. Replace fuel injector on #3 cylinder, ignition pack, throttle position sensor, throttle control sensor. The mechanic did not find any vacume leaks or issues with the O2 sensors.
PLEASE HELP
Thanks

6 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Check cylinder #3 compression if its within specs

Was this

answer

helpful?

Yes

Tuesday, December 4th, 2012 AT 7:20 PM

CERODRIGUEZ40

MEMBER
4 POSTS

I was told it was.

SPONSORED LINKS

Was this

answer

helpful?

Yes

Friday, December 7th, 2012 AT 5:10 AM

CERODRIGUEZ40

MEMBER
4 POSTS

I found a cracked PCV hose connecting to the top the intake manifold. Just received part, replaced both the hose and PCV valve. The idle is much much better. Finally somthing in the right direction. I am still getting P0303 error at idle and while driving. Granted it is not as often but is still there. The idle starts around 1100 RPM and drifts its way down to about 600 RPM. At 600 to 700 RPM area is where I am getting the p0303 and rougher idle. I did notice while at idle, the car scanner shows the voltage of the O2 (1) sensors is up and down while the second is staying constant. Not sure if that is the way it should be.

Was this

answer

helpful?

Yes

Tuesday, December 11th, 2012 AT 1:41 AM