Author Topic: miss fire on start up and diagnostic trouble code help  (Read 1134 times)

Offline firefox

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hi, my mark 4. 1.8t seems to have a few gremlins at the min,


on start up particularly if been stood a while will be very lumpy/ miss firing, no power. i either have to turn off and start again and it runs fine or rev the arse of it and she goes.

also engine man came on over weekend had it scanned this am and following trouble code showed up

p0420

p1200

p1297

anyboday got any ideas what all this could mean.

she was fitted with brand new genuine coil packs and plugs 18 moths ago and had major engine work last year.


help appreciated ta


Offline The Dave

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Re: miss fire on start up and diagnostic trouble code help
« Reply #1 on: 21 March 2011, 11:22 »
16804/P0420/001056 - Catalyst System; Bank 1: Efficiency Below Threshold
Possible Causes
Leakage in Intake and/or Exhaust System
Catalyst faulty
Oxygen Sensor(s) faulty
Oxygen Sensor(s) Control faulty
Possible Solutions
Check Intake and Exhaust System for Leaks
Check Catalyst
Check Oxygen Sensor(s)
Check Oxygen Sensor(s) Control
Perform Oxygen Sensor(s) Aging Check
Special Notes
For 1.8T's experiencing this fault code, this thread may be useful: http://forums.vwvortex.com/zerothread?id=663057


17608/P1200/004608 - Boost Pressure Control Valve (N249): Mechanical Malfunction
Possible Symptoms
Malfunction Indicator Light (MIL) ON
Power Loss
Possible Causes
Boost Pressure Control Valve (N249) faulty
Diverter Valve faulty
Possible Solutions
Check / Replace Boost Pressure Control Valve (N249)
Check / Replace Diverter Valve
Retrieved from "http://wiki.ross-tech.com/wiki/index.php/17608/P1200/004608"
Category: Fault Codes


17705/P1297/004759 - Pressure Drop between Turbo and Throttle Valve (check D.V.!)
Possible Symptoms
Malfunction Indicator Light (MIL) ON
Power Loss
Possible Causes
Leaking Hoses and/or Pipes between Components
Boost Pressure Control Valve (N249) faulty
Diverter Valve faulty
Throttle Body dirty
Possible Solutions
Check Hoses and Pipes between Components
Check / Replace Boost Pressure Control Valve (N249)
Check / Replace Diverter Valve
Check / Clean Throttle Body
Perform Throttle Body Alignment
Special Notes
Did anyone install an extra (wrong) dump valve?
When found in the NAR 2.0T (BPY) check RVUTB: 01-09-03 or 2018919 for updated Crankcase Breather Valve
If the breather valve is faulty, full engine vacuum is typically found when removing the oil cap at idle.

Offline firefox

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Re: miss fire on start up and diagnostic trouble code help
« Reply #2 on: 22 March 2011, 11:44 »
HI THERE,

THANKS FOR THE INFO, I WILL TAKE A LOOK AT THE RELEVANT PARTS AND SEE WHAT I CAN FIND.

COULDNT SEE ANY PIPE OFF, BUT WHO KNOWS WHAT I MIGHT FIND WHEN I HAVE A PROPER LOOK.

THE DUMP VALVE IS STILL THE STANDARD ONE, WHICH HAS BEEN REPLACED WITH ANOTHER GENUINE ONE, ALTHOUGH I AM AAWARE THAT THEY A PROBLEM PRONE SO MAY LOOK INTO A FOGRE ONE.

THANSK AGAIN FOR YOUR HELP

AMY :)