Pelican Parts Forums - 2004 Cayenne-S misfire cylinder 1, 3, 8

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- - 2004 Cayenne-S misfire cylinder 1, 3, 8 (http://forums.pelicanparts.com/showthread.php?t=704924)

2004 Cayenne-S misfire cylinder 1, 3, 8

Hello all,

Need your guys help here. The 04 Cayenne-S was running fine but all sudden losing power while doing a parking with trailer. Idle very rough, low and smell fuel from the exhaust.

Got the code of p0300, p0301, p0303, p0308 they are the multiple misfire and cylinder 1, 3 & 8 misfire.

What I have done already below in sequence:

1. Changed all 8 spark plugs new
2. Changed all Beru coils new.
3. Changed new battery.
4. Disconnect the coil connector 1 & 3 while idling; the same rough shaking; guess there were no spark or signal
5. Swapped camshaft position sensors bank1 and bank 2; was guessing it could be one of CPS bad.
6. Checked each coil connector and power; all are fine.

All resulting in the same things; erased the codes each time but came out the same.

What else can be?

Being doing many research and there are things found that could be; but not sure how to check:

-DME?
-Fuel pump? not enough fuel pressure...but why only 3 cylinders misfire?
-Compression test..can't image why and suddenly if I have 3 cylinders down?

Any input will be great appreciated!

Regards,

Paul

scratching head....

If it were fuel pressure I would think that misfires would be all over the map.

I would check the injector leads for signal. ...check connections...?

Vacuum/air leak of some sort.

Thanks for the info! I got the car running after rev the engine 5k 3-4 times then suddenly it is back. I believe it is the fuel issue; either fuel pump or injectors blocked. will keep checking.

Did you clean the mass air flow sensors? Have you recently used a fuel injection treatment?

Quote:

Originally Posted by Snipernick (Post 6986195)

Did you clean the mass air flow sensors? Have you recently used a fuel injection treatment?

I didn't clean the MAFs; but since it suddenly return to normal now I am driving it full tank with fuel injectors cleaning treatment in it. Hopefully it was just the bad injection. So far being 4 days and running smoothly..just feel much less power with the addictive.

04 S. 184K miles. New plugs. New fuels pumps. Missing. Code misfire cylinder 8. Just replaced all coils. Still rough. Same code after reset. Any ideas?