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Thread: is lean cruise bad for the engine

  1. #1
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    Default is lean cruise bad for the engine

    would this affect the life of the engine even if i could do it in my LL8 I-6??

  2. #2
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    its not bad for the engine. Only problem is if it pings...
    "All that is needed for the triumph of evil is that good men do nothing..."

  3. #3
    Lifetime Member Boost's Avatar
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    I'll have to try to figure out how to enable that. I am getting tons of requests for ecomony tunes. Guess I better read up on custom OS...
    '12 Caprice PPV 6.0 L77 - daily transportation
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  4. #4
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    Well since the LL8s have never been able to do lean cruise like the Holden rides or 04 GTO, I dont know how you'd do it. As Highlander said, shouldnt have any effect unless it pings.
    ~Erik~
    2013 Sonic RS Manual - 1.4L I4T E78, tuned, turbo mods, etc.
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    Yes and No.

    If you live in an emissions state they will nail you for the NoX emissions.

    It can be a problem if you don't have it set up well.

    I have tried running the engine at 17:1 for short periods of time. Basically what I have heard is as long as the load is low you will be ok.

  6. #6
    Lifetime Member 87gmc's Avatar
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    Been running lean cruise for a couple of years now. Just get ready for it to burn the cats up

  7. #7
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    Not a problem here. No reason at all!

  8. #8
    Senior Member Sid447's Avatar
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    I was under the impression,

    lean-cruise raises cylinder head temps and thus raises ECT?

  9. #9
    Lifetime Member Boost's Avatar
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    My initial thought is that I wouldn't worry about it damaging the engine. Most of the conditions where lean cruise is enabled are very low load anyway. Severe damage occurs at high RPM / load.

    And I thought a rich mixture would cause hotter operating temps, or is that only on the rotary engine?
    '12 Caprice PPV 6.0 L77 - daily transportation
    8.7 @ 84 (1/8 mile) bolt-ons

    '02 Silverado RCSB 5.3 L59 - regularly street driven
    8.2 @ 86 (1/8 mile) stock cam and spray
    8.6 @ 84 (1/8 mile) cam and heads no spray

    Our YOUTUBE CHANNEL featuring the Silverado

  10. #10
    Lifetime Member GMPX's Avatar
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    On cars with reasonable camshafts you generally can't use it because the lean mixture causes misfiring. The jury is still out on the real world savings lean cruise actually makes, don't think it's going to turn a 6.0L in to a Honda Civic!

    Cheers,
    Ross
    I no longer monitor the forum, please either post your question or create a support ticket.

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