The engine is not firing on all cylinders.
The malfunction indicator lamp (MIL) flashes.(Misfire Cyl 1-5) Description: If the engine control module (ECM) detects a particular number of misfires during a set number of crankshaft revolutions, this will be interpreted as misfires that could damage the catalytic converter. Poor fuel quality (summer fuel in winter). VolvoECM-3503 Volvo DTC ECM-3503 Make: Volvo Code: ECM-3503 Definition: Misfire, Catalytic Converter Damage. Repeated cold starting where the engine coolant temperature (ECT) has reached normal operating temperature between starts Switch coil packs (1 with 2) and (3 with 4) see if the Misfires move to 2 & 4.ĮCM-3503 = Misfire, at least one cylinder. Two of the junkyard coil packs maybe defective. thoughts things to look at? Thank you for any ideas! I also thought fuel injectors, he says they look good to him. I was thinking this was something with the gasoline but I drove this car yesterday and that's when gas was put in and it ran fine for me and him yesterday. Brand new catalyitic converter and o2 sensors. Still having hard start, rough idle unless gas is pressed.įuel pump was changed for the corrected unit, we did it a few years ago when we got the car. Plugs are new, coil packs are replaced from a junkyard model -same exact vehicle and model engine, tranny etc to see if it would solve the issue really quick til parts come in as we had another car have similar symptoms and this solved it. When pressing the gas it runs fine, issues are happening when the foot is off the gas/idling. Smelling unburnt gasoline, faintly, and in the front of the car by the engine, not as strong as say a fuel pump in the rear of the car.Ĭode reader pulled up ECM-3503, ECM-3513, and ECM-3533Ĭar is hard starting, rough idle, sounds like it wants to die. Having some issues with our 2004, XC90 3.2L Turbo with 241K miles.
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