what all does a car need to run ??

Question

car wont start ?? so what are the major componets for an engnie to start and also how do you test them ??

Answer 1

Fuel, air, spark and compression.
Check with the air cleaner off.
Remove the spark plugs.
Place a small wad of paper in the spark plug holes.
Crank engine and look for the paper if any are in the holes it's compression.
Install the spark plugs.
attach the plug wires.
Using a spark tester connect each wire one at a time to the tester and note the spark strength. If OK disconnect the fuel filter and test fuel pressure with a gauge. If not OK check entire ignition system.
Check fuel pressure OK probably timing if not ok replace fuel pump.

Answer 2

Hello,

the engine needs spark. fuel and air in order to operate. You shall also have an operating start motor to rev it up.

Before doing anything else, check all of your fuses and replace each necessary (with the same current rating (color) )!

Check your battery! If it's below 12.2 Volts, you have very little chance to start, because the starter revs too slow. Also check if the battery has a defect: switch on the lights and see how bright it remains duriong cranking. If the lights stall with the stalling starter motor, your battery may have a bad cell, you should replace your battery. A quiescent voltage above 13 V is also suspicious, indicates that the battery is low or out of fluid.

Fuel check:

Spark check: if you have a car with a spark distributor, just pull off the central cable coming from the transformer, hold the cable close to the engine block. If any of the cables are damaged, buy an entriely new set of spark cables! Ask someone to crank. When there are spraks between the block and the cable, you have spark (though the timing of it can't be checked this way). Do this only after making sure you are holding the cable at an insulated section ! Because this test is done with the transformer cable, you should also see the distributor and the cables going to the cylinders.

Fuel check: if you can crank but it simply doesn't come to life, you can check the following things:
- fuel stoppage - the fuel pump works, but the fuel delivered doesn't reach the injectors/carb. You can check the injectors or you might try a chemical, e.g. Kleen Flo fuel injector cleaner
You can also replace the fuel filter
- fuel pump- if you give the ignition but can't hear the sound of the pump (when it's electric and not mechanical), then you should check your fuel pump fuse. If you don't know what you're doing, and the fuse is intact, don't try to fix it yourself

Air check: check your air filter and intake for stoppage.

If the car doesn't crank, here's a method to bench-test your starter:
http://www.misterfixit.com/starttst.htm
If the starter spins, you should check and/or replace the solenoid.

Good luck

Regards

Answer 3

To start a car needs fuel to burn and spark to ignite it.
Plus some how to time it so fires at the correct time. To test for fuel crack a fuel line and see if it leaks fuel out. For spark take a wire off a plug and place a screw driver in it set it down some place you can see and turn the car over to see if it sparks, do not hold the screw driver as new cars put out a lot of power it can cause injury.
After that you would need to know what kind of sensors your car has and how they work. For instance a late model MB will not turn on the fuel pump if it does not see power to the spark plugs. Some cars will not turn on the ignition if the cam or crank sensor is not present because it thinks the engine is off. With all these things your best bet is to go to a shop. Cars are more complicated and guessing can get expensive.

Answer 4

You have three major components; FUEL, FIRE, AIR. Starting with fuel; fuel pump, fuel filter, fuel relay/fuse. Fire; Spark plugs/wires, Distributor or coil packs. Air; Intake system, throttle body/carbuerator. All these components are specific to the three major things that make your car fire up, but you also have components that cause your motor to turn over; starter, battery , ignition. Testing is little more difficult to answer because their are so many different variations that can be causing your problem, the best thing to do is buy a haynes manual, I have had good luck with these books. A whole lot of detail and step by step break down of what a home/backyard mechanic can do. Good luck!

Answer 5

Besides gas, a good battery and alternator,plug wires and spark plugs.Timing belt,Normally a computer and a large variety of sensors that control fuel and ignition.The first place I'd look if you've already checked the gas is to see if the plugs are firing.Pull off a plug wire,take out the plug,stick the plug wire back on the plug,lay it against the motor block where it's well grounded and have somebody try and start it.You should see a spark in gap while engine is turning over.If not, your problem is in the ignition system.

Answer 6

Your car won't start? What happens when you put the key in the ignition and turn it? Does the engine turn over or do you get nothing except maybe a "click"? If the engine isn't turning over, your battery is dead -- have someone give you a jump-start then drive your car on the freeway for 30-40 minutes to charge up the battery. If the same thing happens again, you'll need to replace your battery. Now, if the engine turns over but doesn't start, there are several hundred things it could be. Best bet there is to take the car to a local mechanic. DO NOT take the car to the dealer -- they'll charge you top-dollar and do lousy work.

Answer 7

It could be a number of problems. It could be a bad spark plug or spark plug cable, or the battery could be dead. If the alternator is bad The car may not be getting enough gas to start. If that's the problem try holding the gas pedal in a bit while you turn the key. This will sometimes get it started. Get this fixed A.S.A.P because it will burn more gas.

Answer 8

Fuel, fire, air, compression. There are many ways to test for these things depending on the year, make, and model of the vehicle. If the battery is fully charged, and the starter is working, bring vehicle to local mechanic for further diagnostics, or.... give more information with your question.(year, make, model, engine size, more symptoms such as cranks o.k., no start, does not crank at all. etc.

Answer 9

Four things. Fuel, correct timing, compression and ignition. If all 4 exist, it should start. Assuming that the engine is turning over. Hope this helps.Master tech 40 yrs.

Answer 10

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