Question about 2002 Chevrolet Silverado 1500

7 Answers

Knocking pinging Hello, I have a 4.3 ltr engine Silverado 02 and everytime I go uphill I hear a knocking or pinging noise. I have done a ll the major tune up and still the same. I read a book and it says check the fuel injection system. So right now I am guessing it might be the fuel injectors. The OBD is flashing a code 300 and sometimes cylinder 6 code would show up. I have changed all the wires and spark plugs too, new distributor, new fuel filter, new air filter and still same problem. So this must be the fuel injectors might last trial and error adventure. Please advise, thanks.

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  • bokols Jul 22, 2008

    Any more opinions.... thanks

  • bokols Jul 24, 2008

    That was very helpful, I will see if I can do this myself if not I need to bring it to the mechanic.

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Get your timing light out and make sure that your timing is set at O degrees. This is very important on a Vortech engine. If you had a blown head gasket the engine would have a undeniable shake. As for the piston hitting the valve, not likely unless you had somehow broken the timing chain. Then the car wouldn't run at all. Make sure the wires are secure on the cap and plug. Look under your cap and check to see if you have a tiny crack in the magnetic pickup.

Posted on Jul 22, 2008

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Hi,

A couple of ideas you can try:

  1. reroute or change the high tension wires (sparkplug wires);
  2. change plugs (cooler);
  3. improve cooling system of the engine (thermostat, coolant/additive, high velocity fan). It might greatly help if somehow you can also improve cooling of the intake air;
  4. back the timing off a bit;
  5. change fuel (octane level);
  6. check/clean/replace EGR;
  7. check/clean fuel system; and/or
  8. check/replace/reprogram (flash) the PCM.
If you have a modified/enhanced engine, have you considered "water injection"?

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Posted on Jul 22, 2008

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Before going after the injectors and just replacing at random,they can be tested through a scan tool,or manipulated is the more accurate term.They can be turned on and off,cycled,and you can hear them and feel them pulse when the engine is off.That isnt to say they aren't dirty and just dropping raw gas in,when they should be spraying a finely atomized mist.Also consider the possibility of a bad fuel pump,check the pressure and volume on the fuel rail.But,to change the subject from fuel,back up to engine basics,testing and evaluation mode.I would recommend a cylinder compression,and leakdown test.These two tests will determine the mechanical condition of the pistons,piston rings,and intake and exhaust valves.All of these mechanical parts can cause a misfire,and have to be evaluated at this point,and it is just testing,and not replacing expensive parts.If all is sound with the tests,procede to the fuel system

Posted on Jul 22, 2008

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HI.....
ON your car P300. is a ramdon missfiring detected.
But on your car the SPARK PLUGS need to be A/C Delco.
For maximun performe. The original Number is: 12571164.
Be sure Don't put Bosh. and Autolite. Because they are no good for your Chevy.
Check for the Coils, for not loss of spark . due a internal or external broke. or crack.
When they are crack the spark going out sound like poping noise. If need replace it.

Check the fuel pressure.
If the fuel pressure is good.
Removing the injector, you can check each one for stuck condittion.
If is nessesary replace.



The

Posted on Jul 22, 2008

  • Juan Guillen Jul 22, 2008

    On your Chevy the injector are under the intake.

    I recomend. get the car scanned with a compatible scanner.

    With the funtion System test, you can test each injector without removing..



    NOTE: the short number of the SPARK PLUGS is R41-932



    Chek the distributor. for the screw holes damaged. and the cap can be move due to a vibration..



    I hope this help on your problem.

  • Juan Guillen Jul 23, 2008

    Check the car for Overheat condittion.

    Check the Fan clutch.

    Try to identified the Number of cylinder with missfiring.

    And Check compression on that cylinder.

    If the compression is slow. or zero, remove the valve cover and check the Push Rod. for Bent or loose.

    Adjust if need.

    Check the timing with a timing light or Compatible Computer Diagnostic scanner. the Timing has to be between -2 and 2 degrees.



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Cleaning or replacing the fuel injectors is a good place to start. However, these engines have a knock sensor that adjusts the timing under different driving conditions, such as putting a load on the engine when going uphill. If the sensor is malfunctioning it will either not adjust or over adjust, over adjusting will cause the engine to knock or ping noticeably.

Posted on Jul 22, 2008

  • Ryan Rogers
    Ryan Rogers Jul 22, 2008

    I've dealt with a knock sensor issue before on a 4.3 Vortek V6 I owned.

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Either your head gasket has blown, a piston hit the top and is now bent (number 6 if the code appears on a scan tool should be suspect), or dirty fuel injectors. try using a cleaner from walamrt or somewhere, and put it in your gas tank. if it dont wokr. you bent a piston or the HG is blown.

Posted on Jul 22, 2008

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Yes this can the fuel injector only

no other way

Posted on Jul 22, 2008

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