Tip & How-To about Chevrolet Chevy

Cars not starting

A lot of times i see in here "my car won't start" or "I put new plugs in it and it still won't start". If it is petrol engine you need fuel (gas at the right mixture with air) in the right amount, a spark at the right time compression in other words the when the piston comes up to the firing time the valves are closed and there is no air escaping past the piston rings or blown head gasket ( low compression). If one of these things isn't happening it won't start.
It is a process of elimination, Check for spark then gas then timing, you may have a spark but at the wrong time and last of all compression test, most engines won't start under 60 lb psi.

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starter works trys tostart but wont

if it tries to start, i.e. it is catching check the level of fuel into the combustion chamber and the power of the spark.
If you crank over several times on a fully charged battery, remove one of the spark pluvs if it is a petrol/gas engine, and check the spark plug tip, it should be moist with gas/petrol or at the very least, smell stronly of it.
If you attach a plug lead to a plug and lean it on the engine and crank the starter over you should see a healthy blue spark between the electrodes.
If the fuel is there and the spark is there at the same time the engine should start, (assuming there is no makor internal problem.)

The issue might be the timing, getting the spark and the fuel to coincide in the combustion chamber when the piston is at the optimum position in the bore.

If there is a weak spark or too little fuel these should be investigated work away from the combustion chambers to the source of the fuel and electricity.
If the spark and fuel are healthy and the timing is okay check compression in the cylinders.
They should be healthy and withing a couple or five pounds of each other

It might be sensors playing up and affecting the ECU, (engine management system)



Jun 23, 2015 | Cars & Trucks

3 Answers

my 2005 kia optima LX ran out of gas and now it won't start, put gas and new battery but still won't start . please help

Paul is on the right ball - it sounds like fuel - turn over the engine with the pipe disconnected until the fuel comes through - if you don't succeed, consult a reputable shop - you need someone that knows what they are talking about to physically look at the car to solve the problem - this will save you a lot of time and expense. ?

Jul 08, 2014 | 2005 Kia Optima

1 Answer

I have a 2000 Yukon Denali, It was starting while I was pouring gas into carbirator, then would stall out. Brought to shop due to water in gas tank due to sitting unused for a long period of time. Shop performed dropping tank and installed new 1, and new fuel filter, also new spark plugs, now my truck starts , but sounds terrrible and I have to play with gas pedal to keep running. Any suggestions would greatly be appreciated.

drain your carburettor from the site check your spark plugs and wash it with petrol start the engine rev 5 to 6 times and memorise the result of it,remove air filter and spray carburettor with engine start and rev the engine up to 3000 rpm or more if you have results at last your problem lies with fuel pressure and quality petrol super with fuel injection cleaner is going to help .you.

Sep 13, 2012 | 2000 GMC Yukon Denali

2 Answers

My Mitsubushi Space Star Car won't Start. What can I try?

spark plugs are deep in the head yet you should get all the the old fuel out first, stale fuel wont ignite and will also clogg fuel filter. you need a mix of atleast 70% new fuel even then its not good for the injecters. If its a manual gearbox a tow start is a quick fix although no go for auto's. cant be much wrong if car was fine when parked, plugs-fuel-filter and possibly fuel pump for sure. If that doesnt fix take plug out put in lead and crank engine to be sure you have spark even just put any plug you know works in lead leaving your plugs in engine just to check for spark y turning over engine looking for spark on plug good spark will be blue but any spark is good.

Jun 16, 2012 | Mitsubishi Cars & Trucks

3 Answers

Stupidity on my part.

Yes you now need new spark plugs. After you change the plugs put about 1/2 a tank of low octane fuel and run that before putting anything else. After putting the fuel in the car keep trying to start the car. It will eventually start just try not to kill the battery too. :)

Sep 29, 2008 | 2006 Kia Spectra

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