Misfires are usually caused by bad spark. During the combustion process any
number of engine conditions can cause emissions failures. Out of the three
systems your engine relies on to produce combustion (air intake, fuel
delivery, and spark control), the spark system has the components which
require replacement most often. Sparkplugs and spark wires are constantly
exposed to high temperatures and high voltages. You must ensure your
Plymouth Voyager's ignition system is functioning properly, by inspecting
all the sparkplugs and their wires. If any of the plugs look worn out or
have excessive carbon build-up replace them immediately. You may use any
brand of product designed to work in your vehicle. The distributor cap
should also be inspected for cracks or excessive carbon deposits. If it
appears that the cap may be faulty, you will need to replace it. More then
likely you will see an instant performance increase once these corrections
are made.
A misfire can also be caused due to high or low CO. A smog check repair
station will first have to find out if your Plymouth's fuel feedback system
is working properly. This includes ensuring the oxygen sensor is working
properly, your vehicle's emissions computer is receiving the signals from
the oxygen sensor, the computer is computing the data properly and sending
the correct signals to the fuel injectors to either increase or decrease
fuel delivery to the combustion chambers.
