Weird sound on acceleration

[fillmore]

Thanks cktsi. On the occasions I have heard the rattle it has been accelerating from a standing or rolling start. Makes me back off and look for flashing lights, etc. Will try as you said up a steep hill and hassle the dealer again.
Have the shudder as well but haven’t noticed it in sequence to this. Strangely it is more noticeable since the 37G7 campaign as I am experiencing more 2nd gear starts.

[moniker]

Thanks cktsi. On the occasions I have heard the rattle it has been accelerating from a standing or rolling start. Makes me back off and look for flashing lights, etc. Will try as you said up a steep hill and hassle the dealer again.
Have the shudder as well but haven’t noticed it in sequence to this. Strangely it is more noticeable since the 37G7 campaign as I am experiencing more 2nd gear starts.

This sounds bad. Are you sure it's not detonation (pinging)? This is exactly what it sounds like. Like balls being shaken in a can. If that's what it is the engine may not last much longer if it keeps up.

Could be a bad batch of fuel?
Are you running 98octane?
Is it worse on hotter days? (maybe hard to find a hot day as it's winter now )

I'd get it checked out ASAP.
Can't believe others say they get It too because if it's pinging that is REALLY bad for the engine

[rockDAhouse]

i always have this tick tick tick sound non stop when i have my window down. If you go fast, i think more than 40km, obviously i can't hear it due to road noise and other cars on the road. BUT if i am in a shopping center car park, driving around looking for a spot. loud and clear ... tick tick tick tick tick non stop ....

[Sentinel]

With the rattling sound, is this like a constant "tick tick tick" for a few seconds? Also, do you hear this with the windows up? Next time it happens, could you check your rear view mirror to see if your car is belching fumes?

I get exactly this behaviour from my 118TSI. Usually after the engine has warmed up, and when I give it a little acceleration in DSG Drive mode. It started happening after about 15,000 km, and at 33,000 km it happens about once every 100km. I have only ever used 98 octane fuel, and 99% of it is BP Ultimate. Serviced every 10,000 km since new.

A brief sound like a paint can being rattled, accompanied by a cloud of smoke in my rear view mirror. I've seen it described on other threads, too.

I'd love to know what it is, and whether it needs fixing while I'm still under warranty.

I also have the clutch shudder, but I think that's a separate issue.

[Klink1313]

i always have this tick tick tick sound non stop when i have my window down. If you go fast, i think more than 40km, obviously i can't hear it due to road noise and other cars on the road. BUT if i am in a shopping center car park, driving around looking for a spot. loud and clear ... tick tick tick tick tick non stop ....

See if you have a nail or screw in one of your tyres. That is what I found when I had a similar noise that I heard only at low speed.

[fillmore]

This sounds bad. Are you sure it's not detonation (pinging)? This is exactly what it sounds like. Like balls being shaken in a can. If that's what it is the engine may not last much longer if it keeps up.

Could be a bad batch of fuel?
Are you running 98octane?
Is it worse on hotter days? (maybe hard to find a hot day as it's winter now )

I'd get it checked out ASAP.
Can't believe others say they get It too because if it's pinging that is REALLY bad for the engine

First started making this sound at around 2k. Now done 43k. Always use BP Ultimate except for the odd occasion I have used Optimax. May be detonation but sounds more mechanical.
Good point about the warmer weather though. Might be why I haven’t heard it recently. And cktsi is right about getting the dealer to experience the issue. Very hard to replicate when it is so intermittent. Your suggestions didn’t work for me.
Also had this log recently
Chassis Type: 1K0
Scan: 01 02 03 08 09 15 16 17 19 25 42 44 46 52 56 62 72 76

VIN: WVWZZZ1KZ9U018000 Mileage: 41900km/26035miles

01-Engine -- Status: Malfunction 0010
02-Auto Trans -- Status: Sporadic communication error 1000
03-ABS Brakes -- Status: OK 0000
04-Steering Angle -- Status: OK 0000
08-Auto HVAC -- Status: OK 0000
09-Cent. Elect. -- Status: OK 0000
15-Airbags -- Status: OK 0000
16-Steering wheel -- Status: OK 0000
17-Instruments -- Status: Malfunction 0010
19-CAN Gateway -- Status: Malfunction 0010
25-Immobilizer -- Status: OK 0000
42-Door Elect, Driver -- Status: OK 0000
44-Steering Assist -- Status: OK 0000
46-Central Conv. -- Status: OK 0000
52-Door Elect, Pass. -- Status: OK 0000
56-Radio -- Status: OK 0000
62-Door, Rear Left -- Status: OK 0000
72-Door, Rear Right -- Status: OK 0000
76-Park Assist -- Status: OK 0000

-------------------------------------------------------------------------------
Address 01: Engine (CAV) Labels: 03C-906-027-CAV.clb
Part No SW: 03C 906 027 BA HW: 03C 906 027 F
Component: MED17.5.5 G 5860
Revision: L1H08--- Serial number: VWX7Z0H73NC8Z7
Coding: 0000077
Shop #: WSC 30061 959 93512
VCID: 61C392CAB8528B1

3 Faults Found:
049409 - No Communication with Transmission Control Module
U0101 - 000 - - Intermittent
Freeze Frame:
Fault Status: 00100000
Fault Priority: 0
Fault Frequency: 5
Mileage: 1048575 km
Time Indication: 0
Date: 2111.15.31
Time: 31:63:63

Freeze Frame:
RPM: 0 /min
Load: 0.0 %
Speed: 0.0 km/h
Temperature: 70.0°C
Temperature: 38.0°C
Absolute Pres.: 1000.0 mbar
Voltage: 12.065 V

000768 - Random/Multiple Cylinder Misfire Detected
P0300 - 000 - - Intermittent
Freeze Frame:
Fault Status: 00100000
Fault Priority: 0
Fault Frequency: 1
Mileage: 41864 km
Time Indication: 0
Date: 2000.00.00
Time: 22:46:34

Freeze Frame:
RPM: 3455 /min
Load: 94.1 %
Speed: 39.0 km/h
Temperature: 48.0°C
Temperature: 11.0°C
Absolute Pres.: 1000.0 mbar
Voltage: 14.478 V

000769 - Cylinder 1
P0301 - 000 - Misfire Detected - Intermittent
Freeze Frame:
Fault Status: 00100000
Fault Priority: 0
Fault Frequency: 1
Mileage: 41864 km
Time Indication: 0
Date: 2000.00.00
Time: 22:46:34

Freeze Frame:
RPM: 3455 /min
Load: 94.1 %
Speed: 39.0 km/h
Temperature: 48.0°C
Temperature: 11.0°C
Absolute Pres.: 1000.0 mbar
Voltage: 14.478 V
Misfired under acceleration from lights and fault in exhaust system light flashed for about 5 seconds.
Dealer reflashed ecu and reset code errors. Customer to trial. Also have fuel consumption increase of about .5lt per hundred. Have extended warranty so going through those channels to have issues resolved. Hoping I can have a trustworthy car by the time this expires as I’m planning on keeping it. All suggestions for a resolution appreciated.

[rockDAhouse]

Hi dieterbohlen (best user name ever btw)

Take it to the dealer and drive around with the head mechanic to demonstrate the sound.
I have done the same as I had all sorts of weird noises (clunck, shutter, pinging). I have over the course of 1 year replaced the waterpump, clutchpack, mechatronik and a new gearbox (all under warranty). The dealer was actually quite keen to get all my problems sorted. I assume its good money for them when they recharge VAG for the warranty work. The car is currently in the shop for a not engaging park brake when in "P", the pinging noise when accelerating and rough idle at startup.

Again, if you need something checked out and fixed the dealer is you best bet. And yes the 7speed is quite noisy when changing gears.

Cheers,
regu

which dealer did you go to? sounds promising

[RW1]

Address 01: Engine (CAV) Labels: 03C-906-027-CAV.clb
Part No SW: 03C 906 027 BA HW: 03C 906 027 F
Component: MED17.5.5 G 5860
Revision: L1H08--- Serial number: VWX7Z0H73NC8Z7
Coding: 0000077
Shop #: WSC 30061 959 93512
VCID: 61C392CAB8528B1

3 Faults Found:
049409 - No Communication with Transmission Control Module
U0101 - 000 - - Intermittent


000768 - Random/Multiple Cylinder Misfire Detected
P0300 - 000 - - Intermittent


000769 - Cylinder 1
P0301 - 000 - Misfire Detected - Intermittent

All suggestions for a resolution appreciated.

I suggest you note 049409 fault as some of the data does not align. It may be spurious. Then clear it down with the rest when the problem is found and fixed.

The two misfire fault codes..... look in No.1 cylinder for a poor spray pattern from the injector. The Spark Plug will either be normal like No.2, 3, & 4 or be very metal clean. And also look for a shiney patch on the piston crown. If a metal clean spark plug or shiney patch, that points to a injector spray pattern. This would also be accompanied with a lumpy idle when warm.

If not that, given you have 24s4 ECU standard firmware G5860, the spark plugs may be too widely gapped. Spec is 0.8mm - 0.9mm. The engine is best run at 0.7mm but VW's NGK plugs were originally supplied as gapped at 0.9mm under part number 101 905 626. Even with 24s4 loaded, misfiring is still murmuring away and occasionally is full blow like above. The revised plugs are 0.8mm and VW do not gap a plug on fitting. It helps at 0.8mm but it is much better from experience of 2 years driving with it set at 0.7mm.

I would doubt it being the coil pack in this case.

You don't have the latest 24s4 issue at G5860 but subsequent updates to 9660 for the DSG version are for a cold start warm-up misfire as coolant temp passes 35'C when in very dry air conditions leading to over weak mixture misfire with wide plug gaps. The other is an engine prolonged warm up time in temperatures below 5'C. So neither needs to be in place unless the engine is experiencing the problems. I run G5860 with 0.7mm plug gap and have had no engine problems for the last 2 years. Never coughed once, even in extremely dry air conditions (humidity below 20% with air temps above 15'C) which before the plug gap reduction it did misfire at 35'C coolant temp.

BTW the dealer hasn't reflashed the ECU as your VCDS readout would have shown firmware 9660 above unless the above is a pre dealer visit VCDS Autoscan record.

[fillmore]

BTW the dealer hasn't reflashed the ECU as your VCDS readout would have shown firmware 9660 above unless the above is a pre dealer visit VCDS Autoscan record.[/QUOTE]

Thanks for your reply RW1. The scan is a pre dealer visit scan and is now running firmware G 9660, which from your post should help cure the misfire as it did occur during warm up. Interesting advice on the spark plug gap too.

[Rob Burns]

The 049409 - No Communication with Transmission Control Module is from when your campaign 37G7 was done. When the transmission control unit is reflashed it loses communication with the other control units. Basically the dealer didn't check for fault codes after the reflash or if they did they didn't delete them.

In other words, don't worry about it. The other faults are a bit of a concern though.