good morning

we present the problem of a CITROËN C3II SC year 2012 mot 1.4 petrol / lpg engine type KFT

LPG leakage, lack of power and MIL light on with 1 or more errors in the engine ecu

P1337 Failure to Burn Cylinder 1 ;

P1338 failed combustion cylinder 2;

P1339 Failure to Burn Cylinder 3 ;

P1340 failed combustion cylinder 4

In addition, if present on the vehicle, the display shows the message : " ANOMALIA ANTI-PLUMPING ".

The causes of the problem are to be found in the short-distance use of the vehicle and the operation of the engine at low revs during predominantly city use of the car, which causes spark plug fouling and fouling of the valves and valve seats

Solution

check spark plugs if excessively encrusted and check valve and valve seats for fouling

replacement of engine oil and filter

Finally, perform the road test for about 30 minutes in order to perform accelerations

bringing the engine from 2500 up to 5000 rpm in third, fourth and fifth gears.

Happy reading and warm greetings from Antonio and the Marelli team