Hello



I picked up and S4 recently with motor problem knowing it had a problem.



The motor idles real rough, backfires, low power, smokes, and dies. When it dies it does not restart for a while, but randomly it will start.


Did a Vagcom scan and this is what I got:


Chassis Type: 8D - Audi A4 B5

Scan: 01 02 03 08 15 16 17 25 35 37 45 55 56 57 67 75 76 77



VIN: WAUPL68E54A284473 Mileage: 260620km/161941miles

-------------------------------------------------------------------------------

Address 01: Engine Labels: 079-910-560-BBK.lbl

Part No SW: 8E0 910 560 C HW: 8E0 907 560

Component: 4.2L V8/5V G 0010

Coding: 0007771

Shop #: WSC 08166 444 52519

VCID: 254FF043EFADDD30723



15 Faults Found:

17799 - Camshaft Position Sensor Bank 2 (G163)

P1391 - 002 - Short to Ground - MIL ON

16684 - Random/Multiple Cylinder Misfire Detected

P0300 - 001 - - MIL ON

16689 - Cylinder 5

P0305 - 001 - Misfire Detected - MIL ON

16690 - Cylinder 6

P0306 - 001 - Misfire Detected - MIL ON

16691 - Cylinder 7

P0307 - 001 - Misfire Detected - MIL ON

17755 - Camshaft Position Sensor 2 (G163) / Engine Speed Sensor (G28)

P1347 - 002 - Incor. Correl. - MIL ON

16692 - Cylinder 8

P0308 - 001 - Misfire Detected - MIL ON

17537 - Fuel Trim; Bank 2 (Mult)

P1129 - 002 - System too Rich - MIL ON

17536 - Fuel Trim; Bank 1 (Mult)

P1128 - 001 - System too Lean - MIL ON

16688 - Cylinder 4

P0304 - 002 - Misfire Detected - MIL ON

16717 - Knock Sensor 2 (G66)

P0333 - 001 - Signal too High - Intermittent

18308 - Coolant Fan Control 2

P1900 - 004 - Open or Short to Ground - Intermittent

16705 - Engine Speed Sensor (G28)

P0321 - 008 - Implausible Signal - Intermittent

16687 - Cylinder 3

P0303 - 002 - Misfire Detected - MIL ON

18080 - Coolant Fan Control 1

P1672 - 004 - Open or Short to Ground - Intermittent

Readiness: 0000 0001





Did a compression test with a cold engine and these are the results:



Bank 1(passenger side)



4) 120 psi

3) 115 psi

2) 120 psi

1) 110 psi

Bank 2(driver side)

8) 0 psi
7) 0 psi
6) 30 psi
5) 0 psi



Did a leak down test on bank 2 with a cold engine and these are the results:



between 20-40%



However when rotating the crankshaft clockwise by hand i noticed that at times the left camshaft on the drivers side bank would not spin sometimes and I had a lot of trouble seating the valves. I would hear an occasional pop and the camshaft would spin a half a turn abruptly. I observed the the passenger side camshafts did not behave in the same way, they always turned with the crankshaft.



Is this a camshaft adjuster problem or is this normal? Am I jumping the gun here or is there anything else to look for?



Thanks
Daryll

 

Sounds like a failed cam chain tensioner to me. That'll throw the cam phasing out, kill your compression, and create the misfires. If your car's build date is earlier than 10/04, they were known for this. The fix is brutal - $500 for the CCT, additional cost for anything else, and at least a partial engine pull to replace the parts.