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A4 b6 3.0L problem with rough idle(help needed)

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Old 09-12-2009, 03:42 AM
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Default A4 b6 3.0L problem with rough idle(help needed)

hi,ive got a audi 2002 3.0l v6.The car has a rough idle and a cel was flashing when car accellarate. i was wondering if anybody could help me with the prolem im having.

Address 01: Engine
Control Module Part Number: 8E0 909 559 D
Component and/or Version: 3.0L V6/5V G 0003
Software Coding: 0016711
Work Shop Code: WSC 63351
6 Faults Found:

16502 - Engine Coolant Temp. Sensor (G62): Signal too High
P0118 - 002 - Lower Limit Exceeded - Intermittent - MIL ON
16730 - Camshaft Position Sensor (G163): Implausible Signal
P0346 - 004 - No Signal/Communication - MIL ON
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 001 - Upper Limit Exceeded - MIL ON
16689 - Cylinder 5: Misfire Detected
P0305 - 001 - Upper Limit Exceeded - MIL ON
16688 - Cylinder 4: Misfire Detected
P0304 - 001 - Upper Limit Exceeded - MIL ON
16690 - Cylinder 6: Misfire Detected
P0306 - 001 - Upper Limit Exceeded - MIL ON

Readiness: 0000 0000


i changed the spark plugs, changed the g163 to a new one, flipped the coil pack (123 to 456) and it still as the codes.
the car is 141 000km (87 000 miles) the timing belt is cracked in many places, and will be changing it at the beginning of next week.

could it help solve the problem?
any help thanks in advance.
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Old 09-12-2009, 10:39 AM
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Default Re: A4 b6 3.0L problem with rough idle(help needed)

Did you clear the codes after switching the coilpacks as I don't know if they will go away by itself. I had multiple "misfire detected" failures within a few weeks with my B6. 2 packs were replaced under CPO as they would only replace those for which codes were shown. The third hasn't come back after the others were replaced.
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Old 09-12-2009, 11:06 AM
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Default Re: A4 b6 3.0L problem with rough idle(help needed)

Are you saying after replacing the items you listed and after clearing codes, the same codes return? If so then possibly new G163 was defective else G163 Wire Harness or ECU has a problem. G163 Wire Harness pinched from previous work? Also recommend to replace engine Coolant Temp Sensor as per your DTC. Flashing CEL under acceleration is because raw fuel is entering exhaust and burning on the metal substrate catalytic convertor(s) causing over temp.
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Old 09-13-2009, 01:23 PM
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Default Re: A4 b6 3.0L problem with rough idle(help needed)

As followed with the Bentley test 1 the one with the led was ok, flashing ok

I also did the second test even if the led was flashing on all 4 cmp sensors.
-Terminal 1 and engine ground=5v ok for all 4.
-Terminal 2 and engine ground ok= samething for terminal 3 and b+
So I jumped to "check phase position of cmp sensor"
Vag com 01-08-093 in display fields 2 I have nothing.

Last edited by tactik; 09-13-2009 at 02:01 PM. Reason: forgot info
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Old 09-14-2009, 01:13 PM
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Default Re: A4 b6 3.0L problem with rough idle(help needed)

You say your timing belt is cracked and worn. I'm betting it skipped a tooth.
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Old 09-17-2009, 10:53 AM
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Default Re: A4 b6 3.0L problem with rough idle(help needed)

I had the exact same problem with my 02 3.0 6 spd. Even after replacing the timing belt, the shake persisted. It felt as if the idle was too low. I hit a deer and the car was written off. Bought a 1.8t and it idles like silk.
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