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The first thing you want to check for is the brake signal,without this signal it will not crank,this is the easy one make sure you get brake light,the second is to have the starter tested by a direct method,this gives the indication of the health of the starter
check and recheck all conections on battery and starter and grounds on battery and the ground on engine bblock and body ground or grounds,if not sure make another one ,check connections at battery ,it does sound like a bad ground to body and eng just make ur owne and see what happens
What's the difference between 'CRANKS" or 'TURN OVER'? Do you MEAN the engine cranks (turns over) but WONT start? If this is the problem, then there are NUMEROUS possible causes (i.e., fuel pressure (fuel pump) Bad Gas/Petrol, Ignition, Air Flow, Cylinder Compression, Crank Position Sensor, vacuum leaks, Nut behind the steering wheel, ECM, etc. An alternator belt would not cause the problem you describe. Take the vehicle back to the mechanic you replaced the belt and tell him to fix it!
A very common problem on the 99 S10 is a leaky fuel pressure regulator in the intake plenum.What happens is when the truck sits for a few hours or more the regulator leaks all of the fuel in the fuel injection system into the intake air plenum. This does 2 things, 1 it has no fuel pressure when starting and 2 it floods the air intake with raw fuel. Sometimes if you turn the key on wait 3 seconds then turn key off then turn key back on and just turn key to crank starter for a split second and wait 3 seconds.do this 3 times to repressurize fuel system then crank to start(you will hear fuel pump buzz each time you do this.also you may have leaky fuel injectors. Try to crank engine with the gas pedel to the floor. This will tell the computer to stop spraying fuel trhough the injectors and it will start. Joe ASE Master Tech
I had this problem that the malibu would not start sometimes. It turned out to be a computer chip. The dealership informed me that they had tested it earlier after we had it towed to their shop and told me it started fine. I wife drove to work and when leaving it would not start the dealership towed without charge and found out it was a computer chip problem.[