Sticking valve maybe, that would cause an unstable idle. Check camshaft lobes.
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...
Last edited by rgnaya; 12th April, 2017 at 08:12 PM.
Sticking valve maybe, that would cause an unstable idle. Check camshaft lobes.
marty35 (17th December, 2020)
But i have checked cylinders compression and it is ok..
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