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I have changed fuel filter and used fuel additive twice.
As in my first post,the vehicle has done 155000 miles,has FULL service history,and has been looked at more than once for this fault,but they are unable to resolve the issue.
I have cleaned the EGR,Maf and Intake temp sender unit,to no avail.
Cambelt has been done at the required service invals,as per the full service history.
If it was the injector pump timimg,surely the fault would be there all the time
Any other ideas?
I had the car plugged in and driven for about an hour on the motorway,the car 'miss fired' alot during this time,but the vag tool did not show any faults.However the MAF reading was a bit low at full throttle.
So I replaced the MAF,but it has made no difference.
I did not clean the intake cooler and MAF manifold,will try this this weekend and see how I get on.
It is strange that it only happens when up to running temp.At cold the fault is not there.
I have flushed out the intercooler and cleaned all the pipe-work out.I also replaced a few vacuum pipes that looked a bit frayed.
The issue is still present.Even though the car has been serviced at the correct intervals,I will replace the fuel filter and air filter this coming weekend.
Is there anything else you could suggest looking at?Dual mass flywheel perhaps?I am grasping at straws at this stage as I am at my whits end.
Am getting the pump timing checked with Vag-com tomorrow,also have a bosch injection system specialist looking at it(Free of charge,fortunately).Will advise how I get on,thanks
Car is sorted now.Replaced the fuel filter,and issue stopped immediately.The garage that serviced the car put some aftermarket one in,now has a genuine filter in.
The injector timing is spot on,however the turbo is overboosting very slightly,so will sort that this weekend.