Dodgeyrodgers

Hi guys, only just joined as never had any issues with car for a couple of years until now .
Car is misfiring and throwing codes P0300+P0301 now it's had new plugs on recent service so was thinking coil pack but what caused it was I topped water bottle up and overfilled it because when I pulled over straight away the next morning after I topped it up there was water all over the left bank+ and what looks like a sensor above cylinder 1 and 2 was also wet ? So after getting water level correct got hair dryer out on the 3 wired sensor and coils then took it for a short road test . Hay presto seemed to have cured it .
3 days later started it up got 2miles down the road same thing happened so drove back home and it's sat ever since ( cleared codes off and they both came back )
Did I not dry out properly or is it just a coincidence that coils packed up the same time I over filled water bottle ?

semicycler

Coil packs tend to crack, especially the earlier revision ones that are likely on your 2005. Just guessing but perhaps the water entered into a cracked coil pack and caused a misfire. P0301 is cylinder #1, driver's side at the rear of the car. I'd pull the coil pack on cylinder #1 and inspect. If it visually looks good, try swapping it with cylinder #3 and see if the misfire code changes to a P0303.

If you decide to replace them the newer revision ones are slightly taller and need a longer screw to hold them down. Take this into consideration when ordering parts.

jeffm

I had similar issue on my 2006 CaymanS. 82k miles and no record of plug/coil service. Had the plugs only replaced and never saw another mis-fire code.
My suggestion would be coils next.

Good luck

Uwon

You'll get the same thing next time you drive in the rain. Change all the coils and be done with it for the next 80k.
Johan

Ben Z

+1 if you've got an '05 sill on its original coils, plus given the problem in the damp, I'd say change them out. Mine was throwing codes too and changing the coils remedied it. It was one of the "little" repairs my extended warranty covered.

Dodgeyrodgers

just about to order new coil pack and found plasma direct ones at a whopping £700 a set compared to £140 for standard ones . Can the difference really be noticed and are they worth the big bucks ?

Dodgeyrodgers

Thanks mate , would you know if it's worth the extra £500 for plasma direct ones compared to £140 standard coil pack set ?

Louis de Funes

I do not know anything about the plasma direct once I would just go OEM. I think you will be fine

myw

+1 get the new larger size coil packs that were introduced in 2013. also be careful when washing the car and spraying water into the unprotected area of the wheel well , the coil packs are all right there pretty exposed.

Dodgeyrodgers

yes I've seen both types the same as old and the newer ones which you mention that require the longer bolts . Was just curious as to these plasma direct jobs that are suppose to be 4x quicker ? ( and 4x the price)

Dodgeyrodgers

mine are well exposed as I've had complete exhaust system removed including both mufflers as they were just adding weight and had straight through LM spec fitted ha ha.