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Old 08-13-2013, 01:34 PM   #1
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Angry Hard start and misfires...

Hey guys, I am really stuck here and could use some help. I have dug around on here and other forums with no luck finding my combo of trouble codes for my Boxster. It's running extremely rough and the codes I am receiving are P0344, P0300, P0306, P0304 and P0305. Thus far I have changed all spark plugs and replaced both camshaft sensors. I'm getting the correct voltage to the sensors as well. This one has me extremely perplexed...

Please advise...thanks!
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Old 08-14-2013, 11:33 AM   #2
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I'd start by inspecting/replacing the specific coil packs (cyls 4,5,6) related to the fault codes. Then clear codes and drive.

P0304 - Cylinder 4 misfire damaging to cat converter
P0305 - Cylinder 5 misfire damaging to cat converter
P0306 - Cylinder 6 misfire damaging to cat converter
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Last edited by thstone; 08-14-2013 at 11:37 AM.
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Old 08-19-2013, 08:39 AM   #3
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I tried that with no luck
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Old 08-19-2013, 09:08 AM   #4
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take care with this one - perhaps you've lost timing on one bank. best off to a mechanic and don't start the car lest you do more damage.
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Old 08-19-2013, 04:55 PM   #5
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Quote:
Originally Posted by kerrvillain View Post
I tried that with no luck
Did you inspect or replace the coil packs?
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Old 08-20-2013, 01:01 PM   #6
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I did both...

And here's the latest update, did a compression test and have no compression at all on #5...the plot thickens!
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Old 08-21-2013, 11:09 AM   #7
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Another update...so far I have uncovered 2 busted lifters, a torn up cam, and a broken valve spring.... I've decided to stop digging and just send it off for repairs. (no time or patience for this)
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Old 08-21-2013, 11:33 AM   #8
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Oh man, bummer. Let us know how it all turns out.
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