c2 vts p1840 fault

[rgnaya]

Hi mates. i get this p1840 dtc from c2 vts 1.6 16v benzine 125 hp.
this car doesnt have Camshaft position sensor, so dtc refer to cylinder 4 ignition fault...
car becames to 3 cylinder.
if start the car and unplug inyector 4 car runs the same (with 3 cylinder fault) but if i unplug another (3,2,1) cylinder car has more inestable rpm..
i try this:
- another 3 bobines
- try to swap inyector 4 for inyector 3 position
- another crankshaft sensor position
- another spark plugs
- another map sensor
- wires continuity from bobine and inyectors to the ecu
- belt timming
- another ecu
- cylinders compression

body computer shows "antipolution sistem fail" then but diag do not shows nothing about it. however i try to put out the catalyst and then car runs something better. then i take to clean the catalyst. i have put the clean catalyst now but the car still the same (runs inestable and if i unplug inyector 4 car runs still the same, but if i unplug another inyector car runs so bad), now body computer shows "defective antipolution system" (before clean it, it shows "antipolution system fail")
what hapens friends? so thanks...

[autoden]

Sticking valve maybe, that would cause an unstable idle. Check camshaft lobes.

[rgnaya]

But i have checked cylinders compression and it is ok..