A good spark will be blue-white and will be plainly visible in daylight. If a good spark is present, the problem is probably not in the ignition system. Check the fuel system and/or stark timing. Weak sparks are orange or red and may be hard to see in daylight.
If the firing end of a spark plug is brown or light gray, the condition can be judged to be good and the spark plug is functioning optimally.
While most spark plugs for passenger vehicles should have somewhere in the 4,000-8,000 ohms neighborhood, your exact plug may call for different values.
The strength of the spark is revealed in the color. A red or yellow spark is weak and probably will not spark in the cylinder. A blue or white spark is strong and has enough voltage to fight across the spark plug gap even under pressure within the cylinder.
If the engine is running to rich the spark plug will look black, sometimes a glossy black if it's really rich. The goal is to get a good dark coffee brown color on the spark plug, which represents the correct color on the spark plug itself, and assures you that the Fuel to Air mixture on your carb is set correctly.
A good spark will be blue-white and will be plainly visible in daylight. If a good spark is present, the problem is probably not in the ignition system. Check the fuel system and/or stark timing. Weak sparks are orange or red and may be hard to see in daylight.
The proper method to check for spark is with a spark tester. It resembles a spark plug but has a sunken center electrode that simulates a load on the coil. Holding the plug wire and seeing if a spark jumps to ground is inconclusive. The spark is arcing in atmospheric pressure.
The strength of the spark is revealed in the color. A red or yellow spark is weak and probably will not spark in the cylinder. A blue or white spark is strong and has enough voltage to fight across the spark plug gap even under pressure within the cylinder.
It may start off as purely physical attraction, but good chemistry also happens when you talk to them. That spark can take multiple forms.
Three dates is a good rule of thumb.
This isn't a hard and fast rule, but let's say you spend two to three hours together on each date, with some emailing, texting, or phone time in between. That's a pretty fair amount of time together. If you're not feeling any sense of chemistry or attachment, it's OK to give up.
A spark-ignition engine is an internal combustion engine, generally a petrol engine, where the combustion process of the air-fuel mixture is ignited by y a spark from a spark plug. A bright blue spark is best. A yellow/orange spark signifies weak ignition.
If the spark is still weak after replacing the whole ignition system, then the normal size wiring or connector to the coil may be corroded or damaged somehow. The other real longshot is that the grounding strap between the engine/trans, body, and negative battery terminal is corroded/worn/damaged.
A red or yellow spark is weak and probably will not spark in the cylinder. A blue or white spark is strong and has enough voltage to fight across the spark plug gap even under pressure within the cylinder.
If your spark plug is white in color or appears blistered, that means something is making the plug run too hot. Check for problems in your engine's cooling, a lean fuel mixture or incorrect ignition timing.
No. You cannot get more power using the same amount of fuel to air ratio by using a stronger spark.
Intermittent misfires are almost always caused by a weak spark or a lean fuel mixture. That piece of knowledge may not tell you what exactly is causing the misfire, but it should lead you toward a coil problem or an injector problem. Random misfires are another type of misfire that can be very difficult to diagnose.
A weak spark, or no-spark, problem may originate within one or more common ignition system components: Worn or damaged spark plug wire insulation. At high temperature, this problem can produce bucking or misfires.
If the spark plug and the rest of the ignition system are working properly, you should see an obvious blue spark arcing between the tip of the inner central electrode of the plug and the curved metal top that arcs downward near it as the engine turns over.
It's important to remember that many times when a coil fails, it becomes weak. It still produces spark, and may still run the vehicle fine at times, but often under load, or acceleration, it can produce a misfire.
Serviceable Spark Plug Resistance
To help assure reliable and trouble free operations, Tempest recommends replacing spark plugs in service having a resistance value of more than 5000 ohms (5k ohms) or less than 500 (0.5k ohms). For new plugs, we recommend 4000 ohms as the maximum acceptable value.
Spark plugs may become less effective at doing their job due to time, wear, or other electrical/ignition system issues. They may become "fouled" over time due to combustion, contamination, or overheating, losing their ability to spark the air-fuel mixture and dissipate heat away from the combustion chamber.
Lack of acceleration
If your vehicle has lost its get-up-and-go, bad spark plugs could be the culprit. When a spark plug becomes fouled or dirty, it doesn't spark effectively which can cause your car to perform sluggishly.
A misfire feels like your engine suddenly loses power. You might experience a hesitation when you try to accelerate the vehicle. If it feels like your vehicle is accelerating slower than usual or if it feels rough, the cause could be an engine misfire.