Question about 2004 Dodge Ram 1500

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I let my friend use my truck and he put 87 octane fuel whem it recommends 89 or higher and since then the check engine light is on and it sometimes pops and sputters and the only way to snap out of it is to hammer the gas until it comes out it.its a 2004 hemi with 72000 miles on it

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Don't think your friend putting a lower octane rating in had anything to do with this. If the 87 octane had trash (sediment, etc.) in it, then maybe there is a connection...but you could get trash in anything.

Go to your local auto parts store for a check engine light test. Many offer this service for free. They can tell you what the DTC reading is and what the likely culprit is.

Go easy on your friend, OK?

Good luck

Posted on Jan 03, 2011

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Posted on Jan 02, 2017

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Which octane is recommended for my infinti g35


yes....87 is perfectly fine and should be used all of the time with confidence. The higher octane fuels can sometimes help with a knocking engine but are mostly used for higher end vehicles.

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Tip

Octane Myth


What is octane? Octane cannot be seen, but it is of utmost importance when it comes to gasoline. One thing for sure, higher octane fuel costs more. Allot more! Simply put, octane is a measure of gasoline's ability to resist detonation, which you hear as pinging and knocking in your engine. The higher the octane the more the fuel can be compressed without detonating before you want it to. Detonation, ping, knock, whatever you want to call it, occurs when the air/fuel mixture ignites before the spark plug fires. The mixture ignites from compression and not from the flame of the spark plug. In other words, the higher the octane the less likely it is to ignite prematurely. The only benefit to a high octane fuel is that it allows an engine to run at a higher temperature and with a higher compression ratio without pinging. Higher octane fuel does not provide more energy, more power, better mileage, more torque, burn cleaner, clean your engine, and is not better for the environment. If the engine is pinging when using the correct octane fuel, then it may be necessary to move to the next higher octane to prevent pinging, and damage to your engine, unless there is another problem. If you are using higher octane fuel for any of these reasons, STOP, you are throwing your money away. Also, never use a lower octane fuel than is recommended by the manufacture. If the manufacture recommends 89 octane then use 89. If they recommend 87 then use 87. The key is what was the engine designed to run at to achieve optimum performance and mileage? One exception is when you are towing a heavy load with a vehicle designed to run on 87 and you experience pinging. In that case it may become necessary to switch to 89 while towing. In conclusion, race car engines are designed to run on high octane fuels due to their high compression engines. You cannot make your engine a race engine just by upping the octane. Save your hard earned money, and use exactly the octane you need.

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1 Answer

I have a 2006 pt cruiser. I just bought pre owned and the check engine light was on. Got the code p0882. Dealer fix it and change the alternator too. On my way home after picking up my car it ran good....


Check applicable trouble codes. Some of the national brand auto stores will check p0 codes for free. I'm not sure of engine liter size?
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Sometimes after filling up, the fumes in the gas tank are stirred up, You may have to check evap system?

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