The vehicle one day would not crank, took it to the mechanic they changed the starter and sure it cranks now but it wont start, another mech checked and said there is no spark to the plugs. what you think it can be?
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Re: cranks but wont start
Engine Cranks But Will Not Start
For an engine to run, you need three things to happen inside the engine. Compression, fuel and ignition, without any one of these components the engine will not run. Basic Checks:
A. Test Fuses. Test both under hood power distribution center and the fuse panel under dash. This is done with a test light tool. The test light should illuminate on both sides of the fuse, if not the fuse has failed and needs to be replaced. B. Testing Fuel Pressure Test for proper fuel pressure with a test gauge on the fuel rail, most throttle body injection cars (TBI) are between 13 psi and 17 psi. and most (DPI) direct port inject systems are between 40 psi and 55 psi. If no or little fuel pressure is observed and there is 12 volt power present the fuel pump, the fuel pump needs replacing. C. Checking Timing Belt Test for compression by removing a spark plug and insert a compression gauge. Crank the engine over about 5 seconds the gauge should read between 125 psi and 165 psi, if no compression is observed remove front engine cover to inspect timing belt or chain. Crank engine to observe cam rotation, if the cam does not rotate the timing belt or chain has failed. (note: if the timing belt drives the water pump it is best to replace the water pump at this time) D. Test for Injector Pulse Remove injector connector to insert injector test light (node) or volt meter. Observe light flash or gauge pulse while cranking. If light/voltmeter doesn't respond, an ignition distributor/crank angle sensor (CKS) or an ignition module is most likely your problem. E. Test for Ignition Spark Remove spark plug wire, insert an extra spark plug into end of wire, rest spark plug next to a ground source then crank engine. You should observe a blue spark between the spark plug gap and ground source. If no spark is observed, an ignition coil, ignition rotor or spark plug wires might have failed. (always keep hands away from engine when cranking)
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If the fuel pump is working and it won't crank, then it could be your starter. The easiest way to test that yourself is to use jumper cables hooked directly to starter. Yes that can be dangerous if done wrong. If you do, here's some pointers.
1 - Make sure the vehicle is firmly parked, E brake, neutral, wheel blocks, anything to make sure it won't move.
2 - A standard that's in gear will move when the starter turns
3 - The last time I did this I had the drive wheels off the ground, no chance of moving.
4 - hook up the cables to the terminals on the starter first, making sure the cables are not in the way of belts / fans etc. Then connect them to the battery, only briefly, if it cranks, the problem is with a fuse / wire / computer etc. If it doesn't crank, buy a new starter. Hope I helped, Grim
car wont crank or car wont start? I would say your battery cables are bad,, acid gets in from battery and erodes internal cable parts... need a Meter to check it out.. put the meter on battery while someone tries to start it, if the voltage drops from 13.5 to 10 then it is trying to turn over, I always have the new starters tester before I leave a store, they are remanufactured in Malaysa and they use old parts in most of them..
Pretty sure I know your issue... Its really common in gm cars.. It happened to my buick.. I found a site that has the fix I even did it myself.. when I took it to the mechanic they were trying to charge me 400+.. read over it Im sure it will help
If the headlights and dashboard lights are working but the vehicle still does not start, the ignition switch is most likely the problem. or a bad wire from switch. If your battery checks out, but the starter is still silent, it may be a faulty ignition switch. Turn the key to the on position (not all the way to start). If the red warning lights on your dash don't light up (and your battery connections are clean), the ignition switch is bad. If they do light up, turn the key to the start position. The dash warning lights should turn off at this key position (most cars). If you're not sure, turn on the headlights. When you try to start the car, the lights should either dim (a lot) or turn off completely. If they do, your ignition switch should be ok. If not, the switch will need replacement. check the wires to starter and see if you have power when car is switched on, do this first! good-day! if it cranks but does not start. check to see if spark and fuel, and check all fuses also.
make sure you have power getting to your starter when you crank. check the small nut on the starter. should have 12 v or very close to it. this will tell you if your getting power to the starter or if somethign before the starter and something maybe with your anti theft system or not. its hard to say online cause of that anti theft. doest the light flash at all? the anti theft light?
if your getting power to the starter when you crank make sure your getting good power to the starter by turning on the head lights and see if they dim. a good starter will cause the headlites to dim when attempting to start. if nothing dims check connections. or assume bad starter motor. make sure your also getting power to the main starter stud as well.