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Be sure the battery is healthy and fully charged at 12.68 volts.
Added: there are several things to check in addition to the battery charge...Also check your battery cables and terminals to make sure they are in good condition. Then check and see if your plug wires are cracked/worn out..Then check the inside of the distributor cap and see if the contacts are worn/corroded.Then remove and check the rotor button inside the distributor and see if it is worn/corroded...
Since you have a distributor cap then you also have an ignition coil which is what generates the spark in the first place,this also needs to be checked along with the coil wire that runs from the ignition coil to the top of distributor cap......
If your vehicle is an even older model vehicle such as mid 70's and before it may have points that need to be checked, cleaned, and gaped or replaced completely.
(note: If your vehicle does not have a removable cap and rotor button as described above,then you have what is called a coil pack and this needs to be checked at a shop..)
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One cylinder is missing It has a weak spark at the plug I changed the plug wires and coil What else would it be?
Could be the plug itself or your distributor cap.
91 cavalier What causes spark before the coil but little after at the spark plugs?
Distributor cap & rotor button or spark plug wires may be bad. Coil could be weak.
What causes a yellow spark at the plug of a Chevy 350 you have power to the coil and the ignition control module It has a crisp blue spark from the plug wire but not at the plug?
poor spark plug gap bad wires or weak coil or bad spark plugs
Why would a 1992 Nissan Sentra 1.6 have gas but a spark so weak that it won't start?
A weak spark can be caused by a faulty ignition coil, or perhaps bad spark plug wires.
What causes weak spark?
Sometimes a weak spark in an internal combustion engine can be caused by dirty spark plugs. It can also be caused by weak distributor coils.
1994 dodge ram 1500 5.9 I replace wires plugs pickup coil rotor and cap strong spark at the coil but at the ignition wires it has a weak spark.?
If you haven't already,Try replacing the plug wires and spark plugs and regap the plugs to factory spec.
What the cause of engine hardstarting?
Weak fuel pump, partially clogged fuel filter, bad spark plugs or plug wires.
How do you know if your coil is bad?
pull the middle wire off of your distributor cap, it should be coming straight from your coil, place it near a ground, or your block, and have some one bump the motor over. you should see a nice bright spark jump. if it is weak or not there at all. if there is a strong spark, then place the wire back, and pull one from a spark plug and repeat the process. if the spark is weak at that point, look in to your points, condenser, cap, and rotor. or possibly your plug wires. if the spark is still strong, check your spark plugs. and make sure the gap on them is correct.
Why is 1999 Gmc suburban miss firing?
Check following symptoms: Weak spark? dirty plugs? old plug wires? bad ignition coil?
How do you know when you have weak spark plugs?
If the spark plug end (combustion chamber end) is coated with dry, black soot, it indicates weak spark or incomplete combustion. Note that this doesn't necessarily mean that the plug is bad; weak spark more often indicates a faulty coil or plug wire or, sometimes, an overfuelled cylinder.
What would couse number 4 cylinder to misfire after changing plugs and wires?
First thing: pull th plug and check the gap and any extreme fowling. My first question to this problem-how do you know it is the #4 plug that is mis-firing? If you are certain it is #4, pull the plug wire, insert a spark testor or an old plug, put on a glove that is well insulated (chore gloves work well dry), have somewone crank the engine, hold plug testor or plug about 1/4" from a well-grounded nut/bolt on the engine and check for spark. If the spark is blue, the spark is good. If it is an orange/yellow, it is weak-check the colil within the distributor. Anther way to check spark is with a spark plug wire light-i use a lisle 19380 wire light-just put the groove area of the tester on the plug wire and it will light if the spark is strong enough.
Why are you getting weak spark in two cylinders?
It depends on the type of ignition system you have. Some have ignition coils at each spark plug, or coils for each plug away from the plug, or coils for every 2 plugs, or a single coil for all plugs. So the coil could be bad, or perhaps simpler the spark plug wire could be bad, or a bad spark plug. If you have a distributor it could be the cap or the signal rotor. There are other possibilities including the Electronic Control Unit, and electromagnetic interference (not likely).
