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P0305 Misfire

Old 12-04-2007, 09:16 AM
Thread Starter
Join Date: Dec 2007
Posts: 1
Default P0305 Misfire

Hi Im new at this just had a diagnostic done code was P0305 Cylinder 5 misfire does this mean that I need to just replace the plugs and wires. Thank you for any help
Old 12-04-2007, 12:31 PM
moe is offline
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Join Date: Aug 2006
Posts: 695
Default RE: P0305 Misfire

thats one way out and cheapest.if it a new 3.3 caravan i know of a flash to the controller.try your way first!good luck,let us
Old 01-01-2008, 08:49 PM
Join Date: Jan 2008
Posts: 1
Default RE: P0305 Misfire - 301 misfire cirrus

Seems Like there is a 100th monkey syndrome here - I own 1996 Cirrus - 2.4L 4 cylinder. 145,000mi. I am having similar problems as 1dakota1 and Jparr etc.

DTC code P0301 = Cylinder #1 misfire.
Check engine flash codes = 124355. (need to find the definitions)

Started as a 'bucking' while driving highway, especially up inclines (50mph). Now, also rough idlying especially when cold. Check engine light went on after going up hill with full load of passengers and car would barely make it up (any gear) - lots of misfiring i guess.

Checked spark plugs and they were clean.

Thought it may be dirty injectors especially since using cheaper gas/ethanol. Used 2 tank fulls with Techron cleaner without result.

Fuel Pump changed last year. Thougt it maybe trans - but seems ok.
Timing belt changed this year.

Suggestion was made to pull fuel rail to check injector flow. Any other suggestions? what are the possible problems? Would DTC mean spark plug fried?
I thank you for your help and expertise. Not sure what is best - general post or ???? please forgive double postings - Thanks! Happy Ne Year!
Old 01-02-2008, 06:02 PM
Join Date: Sep 2007
Posts: 35
Default RE: P0305 Misfire - 301 misfire cirrus

vaccum leaking around number one intake runner or possible intake gasket
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