DIY re-gap factory spark plugs - Page 21
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Thread: DIY re-gap factory spark plugs

  1. #201
    Learning about my Cruze speedy862004's Avatar
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    I thought 35 was the optimal for a passenger car for tire pressure. Why is yours at 44?

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  3. #202
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    Quote Originally Posted by speedy862004 View Post
    I thought 35 was the optimal for a passenger car for tire pressure. Why is yours at 44?
    Off topic, but the answer is that the ECO's LRR tires are rated for 51 PSI Cold. You get better fuel economy with higher tire pressure by lowering rolling resistance. Remember, car manufacturers recommend tire pressure based on comfort, safety, and handling, in that order. Higher pressures transmit more road bumps through to the passenger compartment.

    2012 ECO MT - Black Granite/Cloth; 814 mile range; Bluetooth Stereo AUX; OEM Fogs w/Chrome Covers; GM Spare tire; VG Shark Fin
    2010 Mit Lancer GT MT (traded for ECO @31K miles)
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  4. #203
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    Quote Originally Posted by speedy862004 View Post
    Mine were all around .020. The job overall was very simple. Way to go GM for making this Cruze (as far as I've seen) simple, but boo that I have to do this to begin with. The hardest part was getting them to the correct gap without going over. Took it for a quick trip down the road, and after warm up, I punched it. Seemed to me to accelerate faster, could be just a psychological trick out from thinking I did my engine more justice than I really did it.
    Throttle response will have improved. If you have a manual transmission, the difference is very noticeable. It's not so noticeable with the automatic transmission, but fuel economy should improve slightly. I think people were seeing 1-2mpg better.

    Quote Originally Posted by speedy862004 View Post
    I thought 35 was the optimal for a passenger car for tire pressure. Why is yours at 44?
    You might be interested in this thread:

    http://www.cruzetalk.com/forum/27-fu...-pressure.html
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  5. #204
    Driver's Ed
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    Just checked mine today and found them all at around .025. Bought a wire type gap tool since the coin type can break the electrode off of iridium plugs. Didn't know this and I'm glad I stumbled upon this info since I've been running iridium in my cars for years but never had to gap them before.

  6. #205
    Handbrake Released JayZee's Avatar
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    Just did this. Between .025 and .030 on all four of them. I couldn't tell any more precisely because my gap tool only goes .025, .030, .034, .035, .040.

    I set them all at just barely fitting .034 through.

    Started the car and it sounded like it was clicking. Like a fast clock.

    I read someone else's post that said the car can normally sound like a diesel, so I took it for a spin anyway.

    After two weeks in the shop, I have a running car again.

    Just kidding. The car drove great! It seems like it has bigger balls now. I don't think it's in my head either.

    I will update again on fuel economy. Right now I have Premium in the tank mixed with a little Regular. Probably about 89-90 Octane.

    It used to sound very bad on cold mornings (~20*F). I will note this in the above update after I go through a tank or two.

    Cheers!
    titan2782 likes this.

    1995 Ford Probe SE MTX Red (Totalled. Not my fault!)
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  7. #206
    1st Gear DrVette's Avatar
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    3+ decades w/ Southern Co yielded some info.

    1. Spark plug threads; Use a minimal amount of Copper based antiseize.
    Loctite C5a copper based antiseize.
    Amazon.com: Loctite C5-A Copper Anti-Seize; 51147 C5A 8OZ BT [PRICE is per BOTTLE]: Sports & Outdoors

    Also use a pinprick amount on the plug boot end of the plug, then burnish it in(rub hard), &wipe off.

    2. Use silicone (dielectric) grease on the rubber plug boot. Cruze/Hemi style boots use on outside too.
    Apply both products sparingly.
    Permatex 22058 Dielectric Tune-Up Grease, 3 oz. Tube : Amazon.com : Automotive

    Per GM ser manual, use silicone grease on wiper blades & door gaskets (clean first)
    Last edited by DrVette; 02-05-2013 at 03:01 PM.
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  8. #207
    Handbrake Released JayZee's Avatar
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    I'm at the end of my second tank of gas, and am averaging at or below my original gas mileage.

    I think my plugs were consistent in gap size before increasing each one to ~0.34 which is why I'm not really seeing any better gas mileage.

    Oh well.

    1995 Ford Probe SE MTX Red (Totalled. Not my fault!)
    1999 Mercury Cougar V6 MTX Sport Silver Frost (Traded in for new hotness)
    2013 Cruze LT/RS MT Black Granite Metallic

  9. #208
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    JayZee - winter is a fuel economy killer. See the thread Winter Impact on Fuel Economy and Mitigation for more information.

    2012 ECO MT - Black Granite/Cloth; 814 mile range; Bluetooth Stereo AUX; OEM Fogs w/Chrome Covers; GM Spare tire; VG Shark Fin
    2010 Mit Lancer GT MT (traded for ECO @31K miles)
    2002 Pont Montana AWD (traded for 2012 LS @182K miles)
    1990 Pont Transport (traded for Montana @240K miles)
    1986 Fiero GT MT (traded for Transport)
    1985 Fiero 2M4 MT (traded for Fiero GT @8K miles)

  10. #209
    Driver's Ed Primo's Avatar
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    All my plugs were @ .25

    I can tell you it did change the behavior of the car for the better.

    cruzetalk ROCKS!!
    Last edited by Primo; 02-23-2013 at 09:42 PM.

  11. #210
    Handbrake Released phantomknight321's Avatar
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    Will be doing this either tommorow or sunday, will post the results

    EDIT** Im just going to check the gap for now, dont know if i wanna go with .28 or .35 yet
    Last edited by phantomknight321; 02-23-2013 at 04:33 PM.
    Past: 2012 Cruze LT Auto

    Current: 2014 Hyundai Veloster Turbo

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