Question about 2001 Ford F150 Styleside SuperCrew

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Valve knocking when I put regular gas on my 2002 F150 I hear valves knocking when the truck is cruising and then I switch back to higher octane is fine ,what can I do ?

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Run some stp fuel treatment in it

Posted on Nov 27, 2008

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What type of gas to use for a 1977 ford pickup


87 octane--this least expensive one

If it has a lot of carbon & other problems
try 89 octane if it knocks

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What is the cause of detonation noise ?


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Your engine should use regular gas. But you might be getting some low grade gas. You can try using a higher octane fuel. Or try adding a octane booster.

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Can an 2005 acura run safely on regular gas


The only reason to run higher octane fuels to to reduce the chance of (engine ping) or (engine knock).Try the regular gas(dont completely fill car) and take notice under hard acceleration if engine makes a pinging noise.If pinging happens then add some high octane gas to compensate for regular.Unless this is a modified engine the regular gas will not do any damage it will result in pinging and loss of fuel milelage.

Feb 13, 2011 | 2002 Acura 3.5RL

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I have 2001 V6 Mustang. I was keep putting 87 octan gas but just recently I changed ontan gas from 87 to 91. Is it going to hurt? I shouldn t change it?


No it will not hurt and there is no reason to switch to a higher octane gasoline with this engine. Certain engines in Corvette, Cadillac, etc with special combustion chambers utilizing different types of metal for performance need higher octane gasoline. Your v6 does not. If you hear knocking, have your valves checked and make sure you oil pressure is good. If you switched for no reason, switch back and save yourself $$$

Jan 12, 2011 | 2001 Ford Mustang

1 Answer

Developing a ping... not bad gas, low miles


It may not be bad gas, but it could be the wrong octane rating for that engine. Check your owner's manual and see what octane is recommended for that engine. If you're running 87 octane and it requires 91 or higher octane, then you need to be running the higher octane fuel. By running lower octane fuel in an engine that requires higher octane, your getting pre-ignition, the knocking sound you hear. What's happening is that as the piston moves up on the compression stroke, the gas/air mixture is compressing and as the pressure goes up, so does the temperature of that mixture. It's possible that temperature can get so hot that the gas/air mixture ignites from the high temperature and not from the spark plug. Higher octane fuel will help this since higher octane fuel is harder to ignite. I say try running some 92 or higher octane fuel in your car and see if you still hear the knocking.

Jun 06, 2010 | 1986 Lincoln Town Car

1 Answer

2003 f150 supercrew 2wd 4.6 romeo has 62000 miles.Pinging noticed when thermostat opens after cold start.Pinging occurs with most throttle positions/loads except full throttle (cant hear it) or idle.EGR...


do not use any fuel additives at all. and only use 87 octane fuel nothing higher. 4.6 and 5.4 ford engines do have a pinging sound especially with a load. but it is normal

Aug 19, 2009 | 2003 Ford F150 Regular Cab

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Can I put regular gas in my cadillac deville 1998?


If you mean regular as in to the octane rating, is yes. The octane rating for your car is 87 octane, you could use the higher rating with out harming the engine. But that's just money out the tail pipe. Good luck and hope this helps.

Jun 11, 2009 | 1998 Cadillac DeVille

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Premium or regular gas


Fuel comes in different grades due to octane levels, the higher grade the higher octane, the higher price. If you have the owners manual or window sticker, you would see that the car was probably made to run on 87 octane (regular unleaded), I have been through the different octane levels for more than 30 years and I have decided that the cheapest runs as well as the most expensive. The higher octane will sometimes cause an engine to ping or rattle under acceleration, if this happens to yours go back to the cheap stuff and everything will be fine. That is my opinion, others may differ, but I run my BMW on the cheapest I can find and I still get 31 MPG hwy.

May 20, 2009 | 1998 Hyundai Elantra

1 Answer

My 2004 Cadillac SRX has intermittent pinging or


The pinging noise that you hear is detonation occuring in one or more of the cylinders. The dealer suggested to move to a higher octane inorder to prevent this because the higher the octane the higher the prevention of Detonation.

The Probable cause of the pinging, would be that you refilled with a bad batch of gasoline. Premium should be used in this vehicle no matter what. Due to the clearances of the heads and valves in the motor. And also due to the material used to make the cylinder heads, if severe detonation occures then the valves could be damaged.

Apr 30, 2009 | 2004 Cadillac SRX

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