Missfire at idle and when cruising

[gregorycbr]

Hello I have Leon fr auq engine 20vt 133000km the car has miss fire on idle till 2700-3000 RMP not at WOT pressure 1.35 over somethimes boost come and go . is stage one Revo from factory I do bypass n249 (n249 is connected hoses and plugs) and close EGR from Sai because Sai motor is broken . The has missfire we see the program at 3 shops and the engine compression leak test etc at 3 shops
new sparks bkr7eix new coils new n75 new blow off valve, new crankshaft ventilation kit original . The oil cap when I open it is shaking not sucked in the cover why ventilation is new

 

[mty12345]

Hello I have Leon fr auq engine 20vt 133000km the car has miss fire on idle till 2700-3000 RMP not at WOT pressure 1.35 over somethimes boost come and go . is stage one Revo from factory I do bypass n249 (n249 is connected hoses and plugs) and close EGR from Sai because Sai motor is broken . The has missfire we see the program at 3 shops and the engine compression leak test etc at 3 shops
new sparks bkr7eix new coils new n75 new blow off valve, new crankshaft ventilation kit original . The oil cap when I open it is shaking not sucked in the cover why ventilation is new

Hi mate, that's a difficult one, it sounds like you have tried most things..... Are the misfire's on 1 cylinder or all of them?

Have you checked that the timing belt is ok? Do the cam timing marks all line up as they should? If the cam timing is out that could cause something like this where the symptoms are worse at idle. I would also remove the valve cover and inspect the chain driving the exhaust cam. and sealing.

 

[gregorycbr]

Hi mate, that's a difficult one, it sounds like you have tried most things..... Are the misfire's on 1 cylinder or all of them?

Have you checked that the timing belt is ok? Do the cam timing marks all line up as they should? If the cam timing is out that could cause something like this where the symptoms are worse at idle. I would also remove the valve cover and inspect the chain driving the exhaust cam. and sealing.

All cylinders at WOT go pretty well but the car has Revo at vcds torque is 39kg and max at pull is 25kg is ok this? Compression is perfect.otor has only 130000km same compression all cylinders yesterday with the new oxygen sensor 1st (,3weeks old ) I have code low performance of heater etc and didn't read at vcds today works ok the oxygen sensor it's crazy those things at full throttle I don't have missfire. I have new maf and map Bosch

 

[gregorycbr]

Hi mate, that's a difficult one, it sounds like you have tried most things..... Are the misfire's on 1 cylinder or all of them?

Have you checked that the timing belt is ok? Do the cam timing marks all line up as they should? If the cam timing is out that could cause something like this where the symptoms are worse at idle. I would also remove the valve cover and inspect the chain driving the exhaust cam. and sealing.

New valve cover gasket chain at camshaft looks ok the car sell to me with this problem he can't find the problem. Has new wire harness at injectors . If it's wire harness or earth cables the car has problem at all RMP not at cruising or idle I think.

 

[gregorycbr]