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Thread: Low compression in cyl 3

  1. #1
    sts777 is offline Cadillac Owners Member
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    Low compression in cyl 3

    I have a '96 STS with 448,000+ original miles on it. Cyl. no.3 has been diagnosed with too low of compression for ignition at idle. The engine runs fine at highway speeds. Any solutions out there....I guess I maybe looking at engine replacement...did try 44k seemed to work for awhile. And yes..I know I have gotten my money's worth out of the motor!


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    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: Low compression in cyl 3

    The low compression is the least of your engine's worries - time to do a total top-to-bottom overhaul. EVERYTHING - no old parts.

    Better to do the job on a seasoned known strong block and heads than take a chance on a questionable reman.

    What's "44K" ?? Snake oil ??

  4. #3
    stoveguyy is offline Cadillac Owners Connoisseur
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    What does underside of car look like after 450k miles? Do you live in rust belt?

  5. #4
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    Mileage isn't going to make a difference in what the underside of the car looks like, unless he drives on unpaved roads.

    He's in Colorado.

  6. #5
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    jake99seville is offline Cadillac Owners Member
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    I can't believe he got 450k on it...
    How much did he pay foe upkeep???

  7. #6
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    That much out of the engine is only slightly impressive. But how many times has every chassis wear item been replaced?

  8. #7
    Aztec ETC ECS's Avatar
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    Re: Low compression in cyl 3

    Quote Originally Posted by sts777 View Post
    I have a '96 STS with 448,000+ original miles on it. Cyl. no.3 has been diagnosed with too low of compression for ignition at idle. The engine runs fine at highway speeds. Any solutions out there....I guess I maybe looking at engine replacement...did try 44k seemed to work for awhile. And yes..I know I have gotten my money's worth out of the motor!
    Money's worth? Solutions? Really?
    Are there lot's of tender memories attached to this car or do you want to be the first to turn over a 6 digit odometer?

  9. #8
    stoveguyy is offline Cadillac Owners Connoisseur
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    Re: Low compression in cyl 3

    find a $100 junkyard motor with bad heads. easy. probably has 100k miles. fix heads, install. why overhaul a motor for a super high miles car? trans will die in the next week. dash will say 500k, but motor will have 100k. nice

  10. #9
    Aztec ETC ECS's Avatar
    Aztec ETC ECS is offline Cadillac Owners Connoisseur
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    Re: Low compression in cyl 3


    Am I missing something here?!

  11. #10
    stoveguyy is offline Cadillac Owners Connoisseur
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    Can OP define replacement? Overhaul? A different remaned motor? Used?

  12. #11
    sts777 is offline Cadillac Owners Member
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    Re: Low compression in cyl 3

    In reply to all inquiries about my STS...it sweats a little oil...BG 44k fuel system cleaner is one of the best fuel additives out there...it is not "snake oil" and it works very well....most all chassis parts have lasted to the 400k mark...and tranny went to 377k...still on original cv boots/joints...maintenance has been meticulous....and kept on the highway. I do use a "thicker" oil than the 10w30 like 10 or 15w40. Best car ever owned made by the best: Cadillac!

  13. #12
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    Quote Originally Posted by sts777
    In reply to all inquiries about my STS...it sweats a little oil...BG 44k fuel system cleaner is one of the best fuel additives out there...it is not "snake oil" and it works very well....
    Never heard of it before today, and AFAIK, it's not endorced or recommended by any automobile or engine manufacturers. It's advertised to increase fuel economy and reduce exhaust emissions... It's snake oil.

    But anyway..... Very impressive how long some of the parts have lasted. You must drive 20 MPH on glass . Any pictures of the car?

  14. #13
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: Low compression in cyl 3

    It looks like the stuff sells online for around $19 - $24 an 11 oz. can. That certainly does add something - one heck of a lot of money added to fuel costs for some questionable gain.

    "Cleans intake valves" - Considering that the intake valves are bathed in gasoline mist every two engine revolutions, just how much more "cleaning" do we need ? "Fuel mileage increase" - IF someone uses the stuff each two tankfuls of gasoline, that adds $10 to each fill-up. Quick calculation says that it would need to increase fuel mileage by about 16% in order to break even - that's a normal STS highway mileage of about 25 mpg - add the needed increase and that's 29 mpg. Does your car get 29 mpg, highway ?

    Snake oil. Google "bg44k fuel system cleaner", get into the blogs, and read the pro's and con's from other forums ...........Some like it, some hate it. If it's bought locally, what's the spiff on a can ?

    ............. if the car is primarily highway driven - and you appear to drive an average of 26,000 miles a year - it's no wonder it lasted so long - highway mileage is easy on a car. It's the cities that kill 'em. (Remember - he said the car has been religiously maintained: That implies that anything that could/would/did wear or break was replaced/repaired - cost be damned.)
    Last edited by Submariner409; 07-08-13 at 03:24 PM.


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