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Spark plugs are timed to fire after the cylinder has taken in the fuel/air mixture and compressed, it then ignites the mixture making an explosion and driving the piston back down.
The piston then travels back up again ( no spark ) to expel the burned mixture.
The spark needs to be timed precicely at the point of maximum compression or the explosion will happen too soon or too late and the engine will not run properly.
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∙ 15y ago
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If a spark plug has too much gap will a timing light not read the spark?
First of all, it the plug gap is too large the cyl. will not fire, or fire poorly. and, if there is no spark due to that, then the timing lite will not read anything.
What is the ignition timing point gap and spark plug gap for a 1973 Pontiac 455 v8?
the gap on the distributor points is .016, the timing is advanced 4 degrees and the spark plug gap is .030
On distributorless engines spark plug timing is controlled by microprocessors called?
ecu
Spark knock on 1998 Chevrolet Pickup?
Spark plug knock on a 1998 Chevrolet pickup is an indicator that the ignition timing is correct. By adjusting the timing, the knock can be eliminated.
How do you check the timing on a 1989 ford tempo using a timing light?
Find timing marks 1 on cranshaft and a staionary one mounted to engine around crankshaft area Highlight appropriate mark with chaulk Disconnect #1 spark plug and install timing light between plug wire and spark plug Connect timing light to battery terminals Disconnect and plug vacuum advance line if so equipped Start engine and observe spark flash on timing marks Adjust distributor accordingly to align marks
What causes an engine to miss at high RPM's?
To much base timing or cam/crank timing. Spark plugs,spark plug wire,ignition coils,coil on plug(COP). Fuel pressure/delivery. Contaminated fuel.
What is the difference between advanced and retarded timing?
Advanced timing is when the spark plug fires AFTER Top Dead Center, retarded timing is when it fires BEFORE TDC.
If my '69 125 Cub is getting fuel spark and turns over why won't it start?
"Getting" is not always the answer. "When you get it" can also be an issue. Fuel, of course can come anytime with the intake stroke, however timing of the spark is major important. You already understand engines or you would not be asking this question... but check the timing. For a beginning point go to tdc and mark the flywheel with a chalk reference point. You can tell tdc if you remove the spark plug and stick a wooden rod (pencil) into the hole. You can feel for top dead center of the stroke. Your mark on the flywheel should sync with the spark to the plug. While the spark plug is out, check to see if you have compression. You also can check to see if the exhaust valve are opening. If you have the three elements, spark, fuel and compression, the only thing left is timing. Also, slim chance but the spark may not be strong enough... maybe not enough fuel, maybe not enough compression.... have fun, it is just another adventure. Fuel, spark, compression and timing are the elements of a running engine. You can check for compression and timing as described above. Apparently you know you have fuel and spark, but is the spark getting through to the fuel? Although you may be getting spark, the spark plug may be fouled or bad and the spark is not passing through it. Remove the spark plug and check for spark by inserting it into the plug wire and holding the end of the plug 1/4 inch from the engine. If you still get spark the plug is good, if not, then replace the spark plug,
How do you adjust spark plug of tmx 155?
i guess you have a wrong question..i think you want to ask "how to timing contact point" in igniting spark plug? if that so, i don't know also..
Why would there be oil in spark plug area?
Improper timing, mixture is rich, engine wear.
What causes a Dodge to back fire?
Ignition timing, spark plug or wire, internal engine,
Why is your 1996 formula stx 583 backfiring?
It is either a fouled spark plug or a timing issue.
