Hoping someone can help me try and sort out whats the most likely cause of this problem, I've been reading the forums for ages but there seems to be so many potential things, I'm hoping someone can narrow it down!
A few months ago I got a misfire from the engine, the the proper car almost undriveable type. I got the nearest garage to replace the coilpack that was faulty (number 2), all good. A few weeks after another went, so I ended up changing the rest of the coilpacks to make sure it wouldn't reoccur.
Then recently I've been getting an engine management light, VCDS lite brings up the following error codes:
17705 - Pressure Drop Between Turbo and Throttle Valve (Check D.V.!)
17763 - Cylinder 1 Ignition Circuit: Open Circuit.
17769 - Cylinder 3 Ignition Circuit: Open Circuit
17772 - Cylinder 4 Ignition Circuit Open Circuit.
Interestingly the cylinders throwing up problems are the ones I replaced, I just used the ones Euro Car parts supplied, I can't remember the brand. The garage fitted part however looks identical, even down the colouring of the plastic on top and was the exact same price I paid so I assumed it would be the same part.
Any thoughts on what could be causing this? I've got a silicon TIP to fit, hoping the pressure leak is from around there somewhere, I already replaced all the EGR pipes which had pretty much disintegrated.
Not sure whats causing the misfires.
Physical symptoms I've noticed, are as the car comes onto boost, it comes on strong, backs of a bit then comes back, its most noticeable in 2nd gear, but as accelerating through the rev range the boost level feels like its fluctuating, so the car pulls harder then less, harder then less.
I've checked the resistance on the N75 valve, and its 30ohms.
When I reset the errors by disconnecting the battery it usually takes until the 2nd drive in the car before the error light comes back on.
The car is a 2001 1.8 8L AUM model. Any help much appreciated!
Edit: If its relevant, I only seem to get 22-28mpg, and thats 60 motorway miles every day. Not sure if thats normal or not.
A few months ago I got a misfire from the engine, the the proper car almost undriveable type. I got the nearest garage to replace the coilpack that was faulty (number 2), all good. A few weeks after another went, so I ended up changing the rest of the coilpacks to make sure it wouldn't reoccur.
Then recently I've been getting an engine management light, VCDS lite brings up the following error codes:
17705 - Pressure Drop Between Turbo and Throttle Valve (Check D.V.!)
17763 - Cylinder 1 Ignition Circuit: Open Circuit.
17769 - Cylinder 3 Ignition Circuit: Open Circuit
17772 - Cylinder 4 Ignition Circuit Open Circuit.
Interestingly the cylinders throwing up problems are the ones I replaced, I just used the ones Euro Car parts supplied, I can't remember the brand. The garage fitted part however looks identical, even down the colouring of the plastic on top and was the exact same price I paid so I assumed it would be the same part.
Any thoughts on what could be causing this? I've got a silicon TIP to fit, hoping the pressure leak is from around there somewhere, I already replaced all the EGR pipes which had pretty much disintegrated.
Not sure whats causing the misfires.
Physical symptoms I've noticed, are as the car comes onto boost, it comes on strong, backs of a bit then comes back, its most noticeable in 2nd gear, but as accelerating through the rev range the boost level feels like its fluctuating, so the car pulls harder then less, harder then less.
I've checked the resistance on the N75 valve, and its 30ohms.
When I reset the errors by disconnecting the battery it usually takes until the 2nd drive in the car before the error light comes back on.
The car is a 2001 1.8 8L AUM model. Any help much appreciated!
Edit: If its relevant, I only seem to get 22-28mpg, and thats 60 motorway miles every day. Not sure if thats normal or not.
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