Popping and sneezing of engine in cold weather means your engine got lean running misfire..
When engine misfires, the unburned fuel-air discharged with
exhaust steam that gives a heavy gas smell ….
The misfire produces a vibration in the vehicle that differs
vehicle to vehicle as per rpm..
Engine shows a puff of grey smokes from the
cylinder with leaky injectors…
Worn spark plug
Faulty
spark
plug wires
Leaking
fuel
injector
Vacuum
leak
Worn
rings
and
valve
seals
When the spark happens, it burns out a small part of metal and gradually this process makes the spark plug worn out ….
If the damaged spark plugs not get changed in time then it can lead
to misfire…
Lean misfire happens due to weak fuel injector …
Leaking Fuel Injector
Conditions of leaking in fuel injector :
2. The faulty fuel pressure regulator or plugged fuel return line that
adding too much pressure to the injectors..
Vacuum Leak
Vacuum leak causes a lack of fuel to individual
cylinders and lead to single cylinder misfire.
Vacuum leak always caused by broken piston ring or leaking cylinder head gasket ….
Oil ashes in spark plug always caused by worn
valve stem seals or worn piston rings…
Flash Over or Carbon Tracking
The most common misfire problem happens due to flash over …
If the battery voltage exists but still the cylinder misfires then the quickest
diagnose procedure is to switch the coil from cylinder to cylinder and if still
follows then there is a problem in coil…..
Change the coil and now the engine is ready for work….
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