Golf V5 VAG COM Errors - Cold Start Judder

**redsearich** · 12-12-2009,03:45 PM

Hi
Have just purchased a 1999 Golf V5 Auto and recently on cold wet mornings it struggles with power in low revs 1000-2000. When I accelerate when the engine is cold it judders / stutters before finally the power is delivered in a rush. It also splutters on tick over.

When the engine is warm its smooth and acceleration is perfect.

Has anyone got any idea what the problem might be before I start throwing money away guessing. Please bear in mind I am not mechanically minded, so keep it simple please!

Any help most welcome.

Have just go my VAG COM cable and have scanned for errors:

VAG-COM Version: Release 409.1-US

Chassis Type: 1J - VW G/J/B Mk4
Scan: 01,02,03,08,16,15,17,19,22,35,46,56

-------------------------------------------------------------------------------
Address 01: Engine
Controller: 071 906 018
Component: MOTRONIC M3.8.3 AT V05
Coding: 00001
Shop #: WSC 00842
1 Fault Found:
00668 - Supply Voltage Terminal 30
07-10 - Signal too Low - Intermittent
Readiness: 0000 0001

-------------------------------------------------------------------------------
Address 02: Auto Trans
Controller: 01M 927 733 CM
Component: AG4 Getriebe 01M 3953
Coding: 00002
Shop #: WSC 50004
4 Faults Found:
00518 - Throttle Position Sensor (G69)
16-10 - Signal Outside Specifications - Intermittent
00529 - Shareware Version. To Decode all DTCs
35-10 - Please Register/Activate - Intermittent
00545 - Shareware Version. To Decode all DTCs
31-10 - Please Register/Activate - Intermittent
01314 - Engine Control Module
49-10 - No Communications - Intermittent

-------------------------------------------------------------------------------
Address 03: ABS Brakes
Controller: 1J0 907 379 H
Component: ABS/EDS 20 IE CAN 0001
Coding: 13504
Shop #: WSC 31414
No fault code found.

**redsearich** · 16-12-2009,07:06 PM

Have now cleared my error codes and rescanned after a weeks driving and no errors have re-occured.

I still get a judder/stutter and loss of power between 1000/2000 revs when the engine is cold.

Its worse when its wet, but always goes one the engine is warmed up after 10/20 miles.

Any one any ideas?

**kite** · 16-12-2009,08:24 PM

Try changing the coolant temp sensor.

**redsearich** · 19-12-2009,07:10 PM

Will try replacing the sensor.

Is it an easy job? and what tools do you need?

Thanks

**kite** · 20-12-2009,10:48 AM

Easy.... scewdriver and pliers.
Get a new clip and "O" ring when you get the sensor, you can bet if you don't you'll break the clip...

**redsearich** · 29-12-2009,01:06 AM

Have now changed the coolant temprature sensor and no change.

Still getting the power loss/ judder at around 2000 revs

any more ideas?

Happy New Year!

**kite** · 29-12-2009,09:46 AM

Clean and re-set the throttle body

**redsearich** · 02-01-2010,12:45 AM

Just before I installed a new MAF, I checked the ignition leads going into the coil pack

One of them was cracked and I am replacing the coil pack monday, so fingers crossed

will update if this worked