engine code p0300 misfire

[daithihalton]

Hi great site with a lot of information,
I need help with my 99 boxster 2.7 with 65000 miles the engine light is on with 4 fault codes
p0300, p0301, p0302, p0303 misfire the car will barely rev up and driving it along it is hard to get above 30 mph,
there is a strong smell of unburnt fuel b ut it does not sound like its misfiring just the odd pop and bang not a constant misfire i tried cleaning the airflow sensor and reseting the engine light but it is still the same
has anyone come across anything similar ???
regards Dave

[Sputter]

Did you just do the 60k service? (changed the plugs amongst other things).
They are misfire codes. My best *guess* is either cracked coil pack(s) or loose packs.

[paulv]

Originally Posted by Sputter

Did you just do the 60k service? (changed the plugs amongst other things).
They are misfire codes. My best *guess* is either cracked coil pack(s) or loose packs.

I agree with you as those codes (301-303) are for all the cylinders on bank 1 -- something is going on there......

Regards,
paul....

[daithihalton]

Hi thanks for the reply it is due a service it hasn't been carried out yet I will swop the coil packs to the other side when I change the plugs to see if that helps
it seems strange that all 3 would go at once it idles fine just wont rev !!

[cnavarro]

That's exactly how our car ran when we had a broken valve spring.

Initially thought it was a coil pack.

[daithihalton]

just an update ::
I changed the plugs and swopped the coil packs from left to right, I then reset the airflow sensor with it disconnected and it ran fine no faults,
I then replaced the airflow sensor and the car is back to full power happy days!!!