Problems with the LE5 2.4 VVT
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New Member
Joined: 03-30-11
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From: Minnesota
Problems with the LE5 2.4 VVT
I have had my 08 cobalt sport since febuary now and I was wondering if anybody knew if there are problems and issues to watch out for or procausions like running 91 octane instead of 87. Along with is it worth running seafoam threw intake?? Thanks for the input!!
Just use 87. Its what the engine is tuned for. Only use higher octanes if you get the ECM retuned.
The only issue I really had with my LE5 was the intake cam phaser solenoid. Other than that its a damn solid motor.
The only issue I really had with my LE5 was the intake cam phaser solenoid. Other than that its a damn solid motor.
^Ummm what?
the motor is 10.4:1 compression. you can run 87, but if you drive it hard or plan on taking it to the track, use nothing less than 91.
you could Seafoam it, alot of guys do, wont hurt anything, but i dont use it.
the motor is 10.4:1 compression. you can run 87, but if you drive it hard or plan on taking it to the track, use nothing less than 91.
you could Seafoam it, alot of guys do, wont hurt anything, but i dont use it.
A higher octane rating only means that the fuel has a greater resistance to pre-ignition.
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Joined: 03-03-11
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From: Canada
Why do people speak when they don't know what they are talking about? I just.. I don't understand, quick lesson;
The number of Octane (the best fuel to handle compression) needed for best MPG is almost ALWAYS what the manufacturer tells you in your manual. For 2.4l and 2.0l Engines it recommends 91+ because they are high performance engines, the compression stroke (where the engine compresses a cylinder-full of air and gas into a much smaller volume before igniting it with a spark plug. ) in our vehicles recommends a compression ratio to keep the vehicle running smoothly. The octane rating of the gasoline you put in your car, tells you how much the fuel can be compressed before it spontaneously ignites. When it ignites from compression instead of the spark plugs, it causes knocking in the engine. Refer to the "DON'T USE CHEAP GAS, ON A HIGH PERFORMANCE ENGINE, YOU CHEAP MOTHE.." above or how they put it (more politticaly correct) "Use premium unleaded gasoline with a posted octane rating of 91 or higher." ANYWAYS back to what I was saying.. When you hear knocking, you are playing Russian roulette with your engine and unless you want to save "dollars" which *ahem* is causing worse mileage (BTW, because the compression ratio is too low and their is too much heptane [the other fuel used with Octane-> 87 octane, 13 heptane etc..). Well you are shaving "pennies" off, getting shittier gas mileage and potentially causing 1000's of dollars of damage to your engine.. oh and you are causing your vehicle to perform shitty.
If you want to use 87octane, get a prius. /thread
The number of Octane (the best fuel to handle compression) needed for best MPG is almost ALWAYS what the manufacturer tells you in your manual. For 2.4l and 2.0l Engines it recommends 91+ because they are high performance engines, the compression stroke (where the engine compresses a cylinder-full of air and gas into a much smaller volume before igniting it with a spark plug. ) in our vehicles recommends a compression ratio to keep the vehicle running smoothly. The octane rating of the gasoline you put in your car, tells you how much the fuel can be compressed before it spontaneously ignites. When it ignites from compression instead of the spark plugs, it causes knocking in the engine. Refer to the "DON'T USE CHEAP GAS, ON A HIGH PERFORMANCE ENGINE, YOU CHEAP MOTHE.." above or how they put it (more politticaly correct) "Use premium unleaded gasoline with a posted octane rating of 91 or higher." ANYWAYS back to what I was saying.. When you hear knocking, you are playing Russian roulette with your engine and unless you want to save "dollars" which *ahem* is causing worse mileage (BTW, because the compression ratio is too low and their is too much heptane [the other fuel used with Octane-> 87 octane, 13 heptane etc..). Well you are shaving "pennies" off, getting shittier gas mileage and potentially causing 1000's of dollars of damage to your engine.. oh and you are causing your vehicle to perform shitty.
If you want to use 87octane, get a prius. /thread
Thread Starter
New Member
Joined: 03-30-11
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From: Minnesota
Thanks for the advice ya I've been running 91 because there are times when I do beat on it and don't beat on it...and ya I have just herd the car will run smoother when u run seafoam threw intake and also run in oil 500 miles before oil change to help with sludge
Why do people speak when they don't know what they are talking about? I just.. I don't understand, quick lesson;
The number of Octane (the best fuel to handle compression) needed for best MPG is almost ALWAYS what the manufacturer tells you in your manual. For 2.4l and 2.0l Engines it recommends 91+ because they are high performance engines, the compression stroke (where the engine compresses a cylinder-full of air and gas into a much smaller volume before igniting it with a spark plug. ) in our vehicles recommends a compression ratio to keep the vehicle running smoothly. The octane rating of the gasoline you put in your car, tells you how much the fuel can be compressed before it spontaneously ignites. When it ignites from compression instead of the spark plugs, it causes knocking in the engine. Refer to the "DON'T USE CHEAP GAS, ON A HIGH PERFORMANCE ENGINE, YOU CHEAP MOTHE.." above or how they put it (more politticaly correct) "Use premium unleaded gasoline with a posted octane rating of 91 or higher." ANYWAYS back to what I was saying.. When you hear knocking, you are playing Russian roulette with your engine and unless you want to save "dollars" which *ahem* is causing worse mileage (BTW, because the compression ratio is too low and their is too much heptane [the other fuel used with Octane-> 87 octane, 13 heptane etc..). Well you are shaving "pennies" off, getting shittier gas mileage and potentially causing 1000's of dollars of damage to your engine.. oh and you are causing your vehicle to perform shitty.
If you want to use 87octane, get a prius. /thread
The number of Octane (the best fuel to handle compression) needed for best MPG is almost ALWAYS what the manufacturer tells you in your manual. For 2.4l and 2.0l Engines it recommends 91+ because they are high performance engines, the compression stroke (where the engine compresses a cylinder-full of air and gas into a much smaller volume before igniting it with a spark plug. ) in our vehicles recommends a compression ratio to keep the vehicle running smoothly. The octane rating of the gasoline you put in your car, tells you how much the fuel can be compressed before it spontaneously ignites. When it ignites from compression instead of the spark plugs, it causes knocking in the engine. Refer to the "DON'T USE CHEAP GAS, ON A HIGH PERFORMANCE ENGINE, YOU CHEAP MOTHE.." above or how they put it (more politticaly correct) "Use premium unleaded gasoline with a posted octane rating of 91 or higher." ANYWAYS back to what I was saying.. When you hear knocking, you are playing Russian roulette with your engine and unless you want to save "dollars" which *ahem* is causing worse mileage (BTW, because the compression ratio is too low and their is too much heptane [the other fuel used with Octane-> 87 octane, 13 heptane etc..). Well you are shaving "pennies" off, getting shittier gas mileage and potentially causing 1000's of dollars of damage to your engine.. oh and you are causing your vehicle to perform shitty.
If you want to use 87octane, get a prius. /thread
Use premium on your 2.4.
where i am 93 octane is 20 cents more than 87 per gallon at a 12-12.5 gallon tank thats approximately $2.40 more per tank.... totally worth it for added performance and being good to my motor
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Joined: 02-21-07
Posts: 16,180
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From: Calgary, Alberta
oddly with mine i have to run 87 in the winter and 91 in summer. if i run 91 in the winter i get a crazy amount of misfires and vice versa in the summer. its kinda weird lol. but it works. and i seam foam it once or twice a year.
which vacuum line do you use for seafoam? if you could post a pic of the one i would greatly appreciate it.... i have 2.4 not sure if they are different on the other motors
Senior Member
Joined: 02-21-07
Posts: 16,180
Likes: 1
From: Calgary, Alberta
i don't have a pic at them moment but just disconnect the brake booster line and plug the one end and put the seafoam into the other slowly. this will distribute it equally across all four cylinders.
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Joined: 12-06-10
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From: Hightstown, New Jersey
ok thanks o yeah btw i have 50 k on my car now and i want to seafoam it and maby change the trans fluid and sparkplugs. any imput on that
(i know there is a milloin posts on seafoaming but not for the 2.4 lol. plus i have a lsj throttlebody so there is an extra nipple for a vaccume line that i have plugged)
(i know there is a milloin posts on seafoaming but not for the 2.4 lol. plus i have a lsj throttlebody so there is an extra nipple for a vaccume line that i have plugged)
locate your brake booster line. follow it under the TB on the intake manifold. pour in from brake booster side (not in the brake booster)
i seafoamed right before changing plugs at 45k. It always helps. But do it BEFORE putting in new plugs.
im at 59k and still on original trans fluid. Spring time ill change it.
i seafoamed right before changing plugs at 45k. It always helps. But do it BEFORE putting in new plugs.
im at 59k and still on original trans fluid. Spring time ill change it.
