EGR symptoms

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Northstar Engines and System Technical Discussion Discussion, EGR symptoms in Cadillac Engine Discussion; What are the symtoms of a sticking egr, car is surging a little new coils could possibly be a fouled ...
  1. #1
    TN Torando is offline Cadillac Owners Member
    Automobile(s): 1994 Eldorado
    Join Date
    Jan 2009

    EGR symptoms

    What are the symtoms of a sticking egr, car is surging a little new coils could possibly be a fouled plug, fuel injector, egr and suggestions.

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  3. #2
    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: EGR symptoms

    A stuck open EGR will stall the engine at idle.

  4. #3
    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: EGR symptoms

    Another symptom of a sticky EGR valve is a brief, minor ignition "rattle" on part-throttle acceleration or a low pitched ignition ping during moderate part-throttle such as going up a slight grade. And, as Ranger said, a partly open EGR will trash the idle characteristics.

    It is entirely possible that a surge could be present also, as when EGR operates it dilutes the incoming air (oxygen) charge in order to control combustion temperatures: excess exhaust gas from a fluttering EGR would upset the fuel/air mixture.

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