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Misfire on all 6 cylinders


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Tonight I drove home and 40 miles before destination cell light went on and kept flashing. Was barely able to drive home on (my guess 2-3 cyliners and able to do max 60mph).

Only with very slight amouts of gas the car would keep on rolling.

Car: 996 C2 Automatic from 2002.

Today i connected her to my durametric software and these codes came up:

0300 - general misfire

0301 - misfire cyl1

0302 - misfire cyl2

0303 - misfire cyl3

0304 - misfire cyl4

0305 - misfire cyl5

0306 - misfire cyl6

0343 - camshaft sensor over threshold

0102 - MAF

0139 - O2 behind cat bank 1

0159 - O2 behind cat bank 2

I deleted these codes (since there quite a lot :( ) in an attempt to start te car afterwards and see what codes would come up. Unfortunately it seems my battery has passed anway.. could this have been the cause? Ohh please I hope so..

Thanks all.

Regards,

Sebastian

Edited by doubleb
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Tonight I drove home and 40 miles before destination cell light went on and kept flashing. Was barely able to drive home on (my guess 2-3 cyliners and able to do max 60mph).

Only with very slight amouts of gas the car would keep on rolling.

Car: 996 C2 Automatic from 2002.

Today i connected her to my durametric software and these codes came up:

0300 - general misfire

0301 - misfire cyl1

0302 - misfire cyl2

0303 - misfire cyl3

0304 - misfire cyl4

0305 - misfire cyl5

0306 - misfire cyl6

0343 - camshaft sensor over threshold

0102 - MAF

0139 - O2 behind cat bank 1

0159 - O2 behind cat bank 2

I deleted these codes (since there quite a lot :( ) in an attempt to start te car afterwards and see what codes would come up. Unfortunately it seems my battery has passed anway.. could this have been the cause? Ohh please I hope so..

Thanks all.

Regards,

Sebastian

total guess here -- but maybe you serpentine belt failed, or the alternator gave out and you ended up limping home on battery alone.

but your comment on only running with a little gas makes me think something a little more serious.

I would have it towed and take it to a mechanic and have it checked out.

Mike

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Alright, got the battery recharged and fired her up again, starter motor still not turning the engine with the same speed as I am used (?) but no rattles or strange noises. With the MAF connected she dies very quickly once releasing the gas throttle. So I disconned the MAF, that helped a bit.

I rechecked the codes:

P0343 - Camshaft sensor row 1

P0102 - MAF

When idling (very rough) I checked both exhaustpipes for pressure. Seems the entire bank 2 (passenger side) is not doing anything. No exhaust gasses and pressure from that exhaust (passenger side) at all.

What can this mean? Just the camshart sensor or a camshaft or timing chain malfuntion/defect?? :o Maybe a clogged catalytic converter??

Any thoughts? Would be appreciated!

Edited by doubleb
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Alright, got the battery recharged and fired her up again, starter motor still not turning the engine with the same speed as I am used (?) but no rattles or strange noises. With the MAF connected she dies very quickly once releasing the gas throttle. So I disconned the MAF, that helped a bit.

I rechecked the codes:

P0343 - Camshaft sensor row 1

P0102 - MAF

When idling (very rough) I checked both exhaustpipes for pressure. Seems the entire bank 2 (passenger side) is not doing anything. No exhaust gasses and pressure from that exhaust (passenger side) at all.

What can this mean? Just the camshart sensor or a camshaft or timing chain malfuntion/defect?? :o Maybe a clogged catalytic converter??

Any thoughts? Would be appreciated!

clean or replace maf? replace battery/check voltage and possibly replace alternator. how long had the car been sitting before this happened? possibly all battery related issues... good luck

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Car hasn't been sitting at all, driven every day. Could it still be a battery problem even when one bank is fireing and the other is not (doesn't even have exhaustpressure at the tailgate)?

I am thinking (hoping) the cat on that side has failed and is blocking the exhaust from that side hence had O2 readings etc..

Could that be it?

Edited by doubleb
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  • 2 months later...

Ok, an update. I hate it when I seek a solution to a problem and the symptoms are there in a post, but the post does not contain the solution.

Here we go, turned out the timing chain on the left cylinder bank snapped (bearings intermediate shaft gone bad). It also took out a piece of the camcover. A few bend valves and also the intermediate shaft was damaged. Conclusion, engine overhaul. All parts that porsche had upgraded over the last 8 years have also been replaced by their newest version. Also all parts that are subject to tear and wear (chain tensioners, ramps, bearings etc) including a new intermediate shaft, valves, chains etc. The hole in the camcover could fortunately be welded (a new cover + head, they come together, would be very expensive!).

Total costs 10.000 USD.

I could also have chosen to replace the engine with a used one, however this can be recepy for another failure at any time. Revision gives me a warmer feeling. Now the engine also has warrantly on replaced parts. It runs like it's new and hopefully this won't happen again.. drive1.gif

Edited by doubleb
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