How to troubleshoot spark plugs in small engine?
Examination of the spark plugs can sometimes give a physical clue of the underlying cause. Step 2: Ensure you have fuel, that it’s not contaminated nor stale. Make sure there’s no water in the fuel tank and the octane rating isn’t too low. Step 3: Select your engine concern to understand related causes.
How are spark plugs tuned to offset weak ignition?
Some tuners offset that effect with increased spark advance. We’ve seen ignition advances of 10- to 15-degrees more than baseline values to offset a weak ignition.
What causes spontaneous combustion after a spark plug is fired?
This term refers to when spontaneous combustion happens after the spark plug has fired. This problem could be caused by: Incompatible fuel octane. Lean fuel mixture (too much air). Overheating engine. Advanced ignition timing. Malfunctioning exhaust gas recirculation (EGR) system. The insulator nose will be noticeably damaged.
Which is better for spark plugs high octane or low octane?
Low-octane, as well as high-octane gasoline fuels in a rich mixture leave carbon compound deposits on the spark plug porcelain. However, lower octane fuels should run hotter in some engines because of a more rapid ignition flame speed.
What do you need to know about Spark Plug tuning?
However, a heat indication in one spark plug section may not produce a heat indication in another section of the spark plug. The spark plug has several sections to read to determine the engine tune-up: the porcelain, the housing ring around the porcelain, the strap or outer electrode, the center electrode shape, and the threads.
Where are the spark plugs on a General Motors engine?
The placement of each spark plug wire on the distributor cap is directly correlated to the engines firing order. For example; a standard V-8 General Motors engine has eight individual cylinders. However, each cylinder fires (or reaches top dead center) at a specific time for optimal engine efficiency.
How do you change spark plugs on outboard motor?
Remove the cowling (if necessary) to gain access to the spark plugs. For a twin cylinder engine, label the spark plug wires so that they can be replaced in the correct order. Pop the wires off and unscrew the spark plug(s). Keep track of which plug came out of each cylinder. Now, examine each plug care- fully.
What should the spark plug fire at before TDC?
The spark plug normally fires anywhere from 10 to 45 degrees before the piston reaches TDC, to allow the fuel/air mixture’s flame front to traverse the combustion chamber.