2002 chevy siliverado will turn over, but will not start
I have a 2002 Chevy 4.3, it will turn over but will not start. I have had the plugs, wires, distruibtur cap, crank sensor, intake gasket replaced. It will run for a day... then will not start again. Any suggestions this has been going on for months and thousands of dollars
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You replace parts as part of your preventative maintenance program,not to solve a problem When working on a problem only component testing will find the issues You need to check for fuel pressure at the motor with a gauge You check spark with a test plug you buy,not ground a plug or wire on the vehicle You can check for compression or cylinder leak down to test some mechanical issues I would assume ALL Fuse & links have been checked,as well as battery voltage 12.6 v or more & cables etc The ignition switch could be bad,turns starter but not all the internal contacts are good
I would verify fuel pressure is in spec.On the back of the motor on the drivers side you will find a shrader valve(kinda like a valve stem on a tire)Its just alittle larger.You can buy a fuel pressure gauge at your local parts house and they can give you the spec as well.If its not in spec the pump is in the gas tank.
Timing chain usually does not cause a miss. It may run sluggish or even backfire, but a miss is like a spark plug with the wire off. Like a dead cylinder. Chevy timing chains do stretch but those engines can handle quite abit of timing. I had one with 120K miles and it was only off 4 degrees. That's nothing for chevy to handle. A tune up is usually nothing but a set of plugs and a hook up to a diagnostic machine. I would look deeper. Go out at night, start the engine with the hood open. Make sure you are in a very dark place. Look for sparks jumping from plug wire. Another way to to use a spray bottle of water. Spray a very fine mist of water around the wires. If they are bad, a spark will jump. Check cap for deposits. You can only hope that the plugs were gapped right.