4.9 ping!!!

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HT4100 4.1, 4.5, 4.9 Discussion, 4.9 ping!!! in Cadillac Engine Discussion; 95 SDN DEVLLE. pings when i accelerate,93oct. premium fuel since day 1 timed an tuned a year ago. thanks in ...
  1. #1
    rick davenport is offline Cadillac Owners Member
    Automobile(s): sedan deville
    Join Date
    Nov 2009

    4.9 ping!!!

    95 SDN DEVLLE. pings when i accelerate,93oct. premium fuel since day 1 timed an tuned a year ago. thanks in advance for any info

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  3. #2
    Submariner409's Avatar
    Submariner409 is offline If it won't run, put it on 24s
    Automobile(s): 2002.5 F55 STS - 67,500 miles, 2014 Explorer XLT FWD
    Join Date
    Feb 2006
    MD Eastern Shore, Kent Island

    Re: 4.9 ping!!!

    Remove and clean the EGR valve and passages, then double check the initial timing setting. A sticky EGR valve pintle will cause a brief rattle on acceleration, at an upshift, or up a light grade: usually no ping on hard or WOT accelerations.

  4. #3
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Woodstock Ill.

    Re: 4.9 ping!!!

    The EGR passages that Sub speaks of are down in the TB. Two EGR tubes. They are likely carboned closed.

  5. #4
    brougham is offline Cadillac Owners Master
    Automobile(s): 1991 Cadillac Brougham D'Elegance 5.7 Litre, 1994 DeVille
    Join Date
    Jun 2003

    Re: 4.9 ping!!!

    Add if they aren't the EGR valve could be bad. Changing it is what fixed mine pinging.

  6. #5
    Trilo is offline Cadillac Owners Member
    Automobile(s): 1988 Eldorado
    Join Date
    Dec 2009

    Re: 4.9 ping!!!

    Was there any movement of the Throttle Sensor when you replaced the EGR. There's a specific way to reset the TPS with the ISC and throttle at absolute 0, and the battery cable must be removed to allow the ISC to relearn. Call me crazy but I've always replaced the fuel filter on those years after misdiagnosing everything from fuel injectors to fuel pumps. Clogged filters are notorious for gumming up the works.

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