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The three things a 2 or 4 stroke engine needs to run

The three elements are:

fuel and air mixed together in the correct proportions
compression of the fuel and air mixture
ignition at the right time

If one of these is missing,the engine simply will not run.Now it is your job to find witch one is missing and why?If you will be able to find and fix the problem,you will save a trip to the repair shop.Good luck!

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2 Answers

What can cause my car not to start.?


must start unless there is a problem in the start circuit where there is no ignition circuit while starting ( ignition switch problem)
another problem may be excessive fuel to the cylinders from faulty injectors/ seals
if an engine has good compression, fuel/air mixture, right ignition timing right, correct firing order and the valve timing is correct , then the laws of physics demand that it fires
have you got all of those ducks lined up because if you miss any , it will not work

Nov 23, 2016 | Cars & Trucks

1 Answer

engine vibration


Poor tuning of the engine can result in higher engine vibration. So the fuel and ignition timing MUST be trimmed to allow the engine to tick with ease. if this wont happen the health of the engine is under question and must be checked.
So check the fuel quality, filter and calibration- right fuel mixture of air/fuel.
Next the ignition timing to coincide with the correct timing mark and set using a strobe.
If this wont correct the valve settings, compression and timing must be rechecked.

Apr 06, 2011 | Toyota Corolla Cars & Trucks

1 Answer

Check engine light on. 4 cylinder. Light flashes on acceleration. Sometimes idles rough. Computer scan reads random misfire and #2 & #3 misfiring. Added fuel injector cleaner but no help yet. Cleared computer and light came back on. No arcing spark plug wires that I can see. Any way to test coil?


There are three kinds of gasoline engine misfire scenarios, first there is the "under load" misfire and there is the "at engine idle" misfire, and finally there is misfire continuously. All engine misfires exist because one of three things has occurred. First, a cylinder has lost compression, a cylinder needs a certain amount of compression to operate correctly. Second, the ignition system has failed or is failing intermittently, spark is needed at the time of compression to ignite the fuel air mixture. Third, the fuel air mixture is incorrect, proper mixture is needed for the ignition system to ignite fuel properly. If any of these conditions occur in the engine, the engine will misfire.
1. Low or no compression can be caused by

a. burned or leaking intake or exhaust valves
b. worn or broken piston or piston rings
c. worn out camshaft
d. wrong weight motor oil was installed holding the cam followers from adjusting
e. broken valve spring
f. failed head gasket.
2. Ignition system has failed or is failing
a. spark plug has fouled or is worn out
b. ignition coil
has failed
c. spark plug wires have shorted
e. engine control module coil driver has failed
3. Fuel/Air Mixture is incorrect
a. vacuum leak at the intake manifold
b. fuel injector has failed
c. EGR valve is stuck open
d. mass air flow sensor has failed
e. oxygen sensor has failed
f. air intake boot is cracked

common problems:
1. fuel injector has failed or is failing
2. spark plug wire has shorted
3. spark plug is worn out or is cracked
4. ignition coil has failed is failing

Testing a coil on the car is pretty easy. No special tools are required. Just remember to be careful, the amount of electricity generated by your ignition system can be dangerous. If your coil is already off the car, or if you would like a more specific data-driven test, you can bench test your coil. To set up the test, remove one spark plug wire from its plug, then remove the spark plug using a spark plug socket. Next put the spark plug back into the spark plug wire. Be careful not to let anything drop into the empty spark plug hole -- very bad.

Dec 07, 2008 | 1999 Toyota Camry

1 Answer

Saw will not start Husqvarna 350


Hi

An engine needs three things to run(fuel and air mixed together in the correct proportions,compresion of the fuel/air mixture and ignition).Make carb adjustments,check the compression and the spark from the sparkplug.Priming the engine(put some gas into the sparkplug hole).Try to start the engine.If engine is running only the gas from the cilinder,the chain saw has a fuel delivery problem.Disassembly the carb and clean the inner parts.Check the fuel and air filters,fuel hose and gas tank ventil.

good luck!savumihai71

Dec 04, 2008 | Husqvarna "Chain Saw - 16" Bar, 3 Hp

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