noggen
Member
Hi, I'm having that issue with my 1.6.
Symptoms are:
When hot, engine will misfire. As soon as it reaches ~80 degrees, having the throttle barely open will cause slight juddering back and forth, a small misfire. This has been an issue since I bought it last year, but has not been major and I have slowly been trying small things (coil packs/plugs/earthing/fuel tank cap) to try and help.
I recently drove a little over 100 miles to a car show, and I noticed on the motorway by the end of the trip that now when pressing the accelerator any more than incredibly light acceleration it misfires a lot more, making the car effectively undriveable. This is with a flashing engine light, whereas the past issue never showed any engine lights other than the occasional 'catalyst system below threshhold' error.
Doing some followup testing, the car now only does this badly when hot and been running for about 30 minutes, but has an occasional, smaller misfire before this.
As well as this there is now a noticeable rattle from the engine when warm. This happens when revving up a little, but when the revs are dropping the noise gets louder and/or more noticeable.
I tried a VCDS Scan, bringing up these codes:
Address 01: Engine Labels: Redir Fail!
Controller: 036 906 013 F
Component: MED7.5.11 4628
Coding: 00051
Shop #: WSC 02138
VCID: 1257394B4D77
WAUZZZ8Z73N034025 AUZ7Z0C2390998
4 Faults Found:
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 35-10 - - - Intermittent
16688 - Shareware Version. To Decode all DTCs
P0304 - 35-10 - Please Register/Activate - Intermittent
17912 - Shareware Version. To Decode all DTCs
P1504 - 35-10 - Please Register/Activate - Intermittent
16804 - Catalyst System; Bank 1: Efficiency Below Threshold
P0420 - 35-00 - -
Readiness: 0000 0000
The shareware codes being a misfire on Cylinder 4 and an intake leak.
Looking on other forumn posts, people suggested that this could be a faulty High Pressure Fuel Pump. I bought spares of these, but it has not helped.
After rescanning, it brings up the same codes, minus the Catalyst System 16804 code.
Wondering if it would be an injector, but this doesn't explain the rattle? Could also be EGR valve or tubes?
Just want an idea of what to replace! Love the car, but have limited budget to try and fix this, so want to get the cause of the issue as soon as possible without trying too many wallet draining ideas.
Thanks!
Noah
Symptoms are:
When hot, engine will misfire. As soon as it reaches ~80 degrees, having the throttle barely open will cause slight juddering back and forth, a small misfire. This has been an issue since I bought it last year, but has not been major and I have slowly been trying small things (coil packs/plugs/earthing/fuel tank cap) to try and help.
I recently drove a little over 100 miles to a car show, and I noticed on the motorway by the end of the trip that now when pressing the accelerator any more than incredibly light acceleration it misfires a lot more, making the car effectively undriveable. This is with a flashing engine light, whereas the past issue never showed any engine lights other than the occasional 'catalyst system below threshhold' error.
Doing some followup testing, the car now only does this badly when hot and been running for about 30 minutes, but has an occasional, smaller misfire before this.
As well as this there is now a noticeable rattle from the engine when warm. This happens when revving up a little, but when the revs are dropping the noise gets louder and/or more noticeable.
I tried a VCDS Scan, bringing up these codes:
Address 01: Engine Labels: Redir Fail!
Controller: 036 906 013 F
Component: MED7.5.11 4628
Coding: 00051
Shop #: WSC 02138
VCID: 1257394B4D77
WAUZZZ8Z73N034025 AUZ7Z0C2390998
4 Faults Found:
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 35-10 - - - Intermittent
16688 - Shareware Version. To Decode all DTCs
P0304 - 35-10 - Please Register/Activate - Intermittent
17912 - Shareware Version. To Decode all DTCs
P1504 - 35-10 - Please Register/Activate - Intermittent
16804 - Catalyst System; Bank 1: Efficiency Below Threshold
P0420 - 35-00 - -
Readiness: 0000 0000
The shareware codes being a misfire on Cylinder 4 and an intake leak.
Looking on other forumn posts, people suggested that this could be a faulty High Pressure Fuel Pump. I bought spares of these, but it has not helped.
After rescanning, it brings up the same codes, minus the Catalyst System 16804 code.
Wondering if it would be an injector, but this doesn't explain the rattle? Could also be EGR valve or tubes?
Just want an idea of what to replace! Love the car, but have limited budget to try and fix this, so want to get the cause of the issue as soon as possible without trying too many wallet draining ideas.
Thanks!
Noah