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Engine Ping When Accelerating

This is a discussion on Engine Ping When Accelerating within the General Help forums, part of the LSx Technical Help Section category; Car is 1999 Z28 that was originally a V6 that got totalled and rebuilt I bought it about 2 years ...

  1. #1
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    Thumbs down Engine Ping When Accelerating

    Car is 1999 Z28 that was originally a V6 that got totalled and rebuilt

    I bought it about 2 years ago so dont know details of all the history

    120,000 miles on odometer but no way to be sure of actual mileage on engine

    Runs very good but lately has engine ping (spark plug knock) when accelerating most of the time

    I took it to Chevy dealer and they basically told me not to worry about it but it is annoying and Ive read that it can damage your engine

    Dealer also acting strange about doing any kind of computer programming on the car because "We dont know for sure what engine or chip is in there"

    Anyway, what is most likely the cause of the engine ping ?

    -EGR valve?
    -Fuel filter?
    -Knock Sensor?

    There are no engine lights coming on and as far as I know all the lights still work

    Thanks for any help and I will post some pics soon

  2. #2
    Member c5z28's Avatar
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    Quote Originally Posted by CJoel View Post
    Car is 1999 Z28 that was originally a V6 that got totalled and rebuilt

    I bought it about 2 years ago so dont know details of all the history

    120,000 miles on odometer but no way to be sure of actual mileage on engine

    Runs very good but lately has engine ping (spark plug knock) when accelerating most of the time

    I took it to Chevy dealer and they basically told me not to worry about it but it is annoying and Ive read that it can damage your engine

    Dealer also acting strange about doing any kind of computer programming on the car because "We dont know for sure what engine or chip is in there"

    Anyway, what is most likely the cause of the engine ping ?

    -EGR valve?
    -Fuel filter?
    -Knock Sensor?

    There are no engine lights coming on and as far as I know all the lights still work

    Thanks for any help and I will post some pics soon
    Pull the spark plugs and see for any excessive wear, burnt, red color etc. Go to the regional section and ask where a local tuner is.

  3. #3
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    Thumbs down

    Dealer told me spark plugs were good

    But I dont know if I trust them at this point

  4. #4
    Member c5z28's Avatar
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    so pull them-have you looked for local tuners so they can run it with the computer connected.

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    Ive talked to a different shop on the phone who seems cool. Will probably end taking car there before I go back to dealer for anything

    He told me try adding Octane booster or using lower octane gas to see if the knock gets better or worse

  6. #6
    Member c5z28's Avatar
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    May not be true for all but should be taken into account

    http://www.installuniversity.com/ins...sity/index.htm

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    Member Rk ws6's Avatar
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    HAHAH weird just had this comming home mine threw the service engine soon light and was just plug wires that werent pushed all the way on....

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    Ping is very serious for any engine, especially these, and you should address it asap. Ping or detonation or knock is the burning of the fuel mixture prematurely due to heat and compression in the cylinder and can damage pistons quickly.

    Common causes of ping:
    Engine running hot
    Lean fuel mixture
    Low octane fuel
    Wrong heat range plugs
    Carbon build up in the cylinders.

    First and easiest thing to try is different fuel and make sure you get good high Octane - 91+ octane.

  9. #9
    Retired NOT tired SteveC's Avatar
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    It could also be a timing issue.

    SteveC

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    Im already running 93 octane and always have. Should I try running lower octane or adding octane booster?

    What is the best kind/brand of spark plugs for LS1 ?
    Last edited by CJoel; 09-06-2009 at 08:22 AM.

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    Quote Originally Posted by DaddySS View Post
    Ping is very serious for any engine, especially these, and you should address it asap. Ping or detonation or knock is the burning of the fuel mixture prematurely due to heat and compression in the cylinder and can damage pistons quickly.

    Common causes of ping:
    Engine running hot
    Lean fuel mixture
    Low octane fuel
    Wrong heat range plugs
    Carbon build up in the cylinders.

    First and easiest thing to try is different fuel and make sure you get good high Octane - 91+ octane.
    If Carbon buildup is the problem, what can be done about that?

    When you say engine running hot , that means my temp guage right ? (Just want to be sure)

  12. #12
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    Top engine cleaner for the carbon build up. GM, sea foam, mopar top end cleaner - take your pick.

    Engine temp on the gauge - correct

    NGK TR55s gapped to .060 for plugs

    For fuel, sometimes just changing brands helps

    It could be timing but I wouldn't expect your timing tables to change.

    Pull the plugs and see what they look like.

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    are there any mods done to the car or pcm?

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    Quote Originally Posted by 0rion View Post
    are there any mods done to the car or pcm?
    None to the engine that I know of

    The car was lowered a little and it has 17" inch SS rims

  15. #15
    Change the fuel filter and if it still pings test the fuel system pressure. I had the engine in my 99 ta ruined becauce some idiot drove it WOT with a blocked fuel filter....number 7 cylinder doesn't take that for very long before it it spits pieces of piston into the exhaust.

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    Quote Originally Posted by 99RTA View Post
    Change the fuel filter and if it still pings test the fuel system pressure. I had the engine in my 99 ta ruined becauce some idiot drove it WOT with a blocked fuel filter....number 7 cylinder doesn't take that for very long before it it spits pieces of piston into the exhaust.
    What is WOT ?

  17. #17
    WOT=wide open throttle=broken piston if fuel filter is blocked and idiots continue to go WOT trying to get the trans working properly while the engine pings and knocks.

    If you hear pinging AT ALL in a LS1 STOP HALT do not continue unless you like fubar.
    Last edited by 99RTA; 09-08-2009 at 12:06 PM.

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    Quote Originally Posted by 99RTA View Post
    WOT=wide open throttle=broken piston if fuel filter is blocked and idiots continue to go WOT trying to get the trans working properly.
    Ah ok thanks

    How often do you change your fuel filter on your car?

  19. #19
    once a year OR if i ever hear pinging!

  20. #20
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    Quote Originally Posted by 99RTA View Post
    once a year OR if i ever hear pinging!
    Thanks for the info

    Did they fix your car after driving with blocked fuel filter?

    Hopefully a fuel filter will solve my problem

    How exactly does the fuel filter cause pinging ?

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