Question about 2000 Chevrolet Silverado 1500

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Help fix start problem with truck

4.3 engine all new parts: fuel pump, fuel filter, rotor and cap, plugs and wires and relay switch. Cranks but will not start.

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Sounds like you shotgunned all the parts but you did not diagnos what the problem is.. I suggest that you check to see if the engine has fuel and spark, these are the 2 things that would keep this engine from starting. OTHER than a MAJOR INTERNAL ENGINE FALIURE. Such as a broken timing chain, broken cam shaft broken crank shaft.. and yes i have seen all of these problems.
open the distributer and crank the engine see if the dist shaft/roror is turning.. This would tell you that the cam is not broken and the timing chain is functioning. Post and let us know what you find. This is a very sturdy engine. so i would look for spark and fuel delivery.

Posted on Mar 30, 2015

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1 Answer

Engine cranks but wont start


Well Dave you just can't replace parts an hope you fix it ! There are test that need to be done to find out what system is malfunctioning ! If no spark , the ignition system is at fault ! An that could be any one of a number of things , ignition control module , engine computer ,crankshaft position sensor. If the fuel system is at fault is there battery voltage getting to the fuel pump through the relay , is the PCM turning on the relay ? The relay is most often a four pin relay an where it plugs into the fuse / relay box you can test for power an ground an control of the circuit ! Another possibility would be the anti-theft system not letting it start, any light like SECURITY lit on the dash ? Rather then just replacing parts Dave in a random fashion ,you need to find out what is missing fuel , spark an is the engine in good mechanical condition an no SECURITY light ! good luck Dave !

You spent more on parts then it would have cost to take to a repair shop !

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Have your ignition module checked, my car would start and drive and would go dead after a few miles and would not start until it cooled down, turned out to be the ignition module that eventually went bad and would not start at all.

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19 Inspect Carburetor -- Carburetor Flooded or Faulty Choke.
20 Inspect Distributor Cap -- Worn, Loose, Cracked, or Incorrectly Installed Distributor Cap.
21 Inspect Distributor Rotor -- Worn, Loose, Burnt contact surface
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2 Answers

Cranks but wont start


you need to check for spark at the plugs while cranking.then check for fuel entering the intake at the injectors.you don`t say if its a 4 or 6 cylinder.if its a 4 cylinder you can look into the throttle body while someone cranks the motor and you should see fuel squirting into the intake.if you have no spark then check to make sure the cap and rotor is in good condition and the rotor is turning(if not then the timing belt maybe broken and needs replacing.also check the plugs as if they are worn so bad you won`t get any spark.a common problem on these is the coil pickup in the distributor going bad.there is a 2 wire connector that comes out of the distributor with a plug,if you follow this wire back into the distributor you will see the pickup.also check and see if you can hear the fuel pump running while cranking,you may have a bad fuel pump.you may have to remove the gas cap and listen at the filler neck or listen under the car were the gas tank is.if the fuel pump is not running then you can hit the fuel tank in the middle while someone cranks the motor and it might start.if so then the fuel pump is no good another common problem.there is a fuel pump relay under the hood on the drivers side that sometimes goes bad or there is bad connections.most of this checking is good for the 6 cylinder as well except you can see the fuel squirting into the intake.it could also be a bad computer that will have to be checked out at a shop.

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1 Answer

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1 Answer

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