Calling all 4.5 PFI and 4.9 PFI Owners - Page 2
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HT4100 4.1, 4.5, 4.9 Discussion, Calling all 4.5 PFI and 4.9 PFI Owners in Cadillac Engine Technical Discussion; He used seafoam in the gas tank, not the throttle body. I have used seafoam in my gas, but didn't ...
  1. #16
    gta3mobster's Avatar
    gta3mobster is offline Cadillac Owners Member
    Automobile(s): 1990 Deville Sedan
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    Dec 2006
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    Re: Calling all 4.5 PFI and 4.9 PFI Owners

    He used seafoam in the gas tank, not the throttle body.

    I have used seafoam in my gas, but didn't notice anything.

    When it comes to cleaning out the engine, run a straw from the PCV valve hose and dip it in and out of the can while a friend keeps the throttle at ~2000 RPMs. Once the bottle is half gone, drop the straw all the way down. The engine should suck up the rest of the can and die. If it doesn't die, have the friend cut the ignition.

    GM TEC (top engine cleaner) seems to be the popular choice at the forums, but I like seafoam since it's liquid and not a spray. You can get TEC at any GM dealership.

  2. #17
    awadecki is offline Cadillac Owners Enthusiast
    Automobile(s): 76 Eldo (54k), 76 Eldo (52k), 78 Eldo (9k), 85 Deville (43k)
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    Re: Calling all 4.5 PFI and 4.9 PFI Owners

    GM TEC has been discontinued (part #10500002)

  3. #18
    Sickapotamus's Avatar
    Sickapotamus is offline Cadillac Owners Member
    Automobile(s): 93 Seville STS 4.9
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    Re: Calling all 4.5 PFI and 4.9 PFI Owners

    i have run redline fuel system cleaner on a couple acura cars i have owned and it felt like it made a difference. one bottle is about $8 is all. i haven't run it in the cadi yet. i may try it later today if i get a chance.

  4. #19
    gopedtyper is offline Cadillac Owners Member
    Automobile(s): 94" 4.9 deville
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    Re: Calling all 4.5 PFI and 4.9 PFI Owners

    94 sedan deville 280k miles needs struts and a head gasket and it still runs like a CHAMP tranny is a lil touchy changed the oil today =p

  5. #20
    gopedtyper is offline Cadillac Owners Member
    Automobile(s): 94" 4.9 deville
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    Re: Calling all 4.5 PFI and 4.9 PFI Owners

    how do i get the engine light of the the egr on a 2001 alero

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