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Why is my 2003 ford expedition making a knocking sound when stepping firmly on gas?
That knocking sound could be any number of mechanical and non-mechanical noises. It is most likely in a vehicle that new, the noise you are hearing is not mechanical at all. Its called fuel knock, or more commonly known as gas ping. That noise is actually two different flame fronts in the cylinders hitting each other. It occurs when your spark plug is lighting the air fuel mixture in the cylinder at the top, but heat is actually lighting the mixture at the bottom. When the flames hit each other, you get a metallic ping noise. Now picture all 8 cylinders at 2,000 rpm, having this problem. It can make a really hell of a racket.
First thing you should do is change your gas. I'd use a different gas station, and start buying the next higher octane level. So if you have been using regular (89 octane), go one step up to mid-grade (91 octane). The higher the octane, the harder the gas is to burn (ever so slightly). That will make it harder for heat to set of the mixture in your cylinders.
If that still doesn't work, take your vehicle to the garage, and ask for a carbon clean out. Picture an I.V. for a person at a hospital. They will do the same thing for your car, and they will drip a chemical into your engine that burns a lot hotter than gas does. This will hopefully burn off all the excess carbon that might have built up in your cylinders.
GOOD LUCK!
What else can I help you with?
What is making the engine knocking when driving?
your foot
What is another meaning for knocking?
In many card and token games a player is required to knock the table when he's down to one token/card The player so doing is said to be 'knocking' A gasoline motor is said to be 'knocking' when the air/gas mix is too lean Knocking can also be criticising, using a knocker of a door, declaring an auction over Knocking off: finishing work for a break, or the day: making a hasty job of: robbing Knocking up: waking: making pregnant: making hasty job of Knocking over: robbing Knocking down: to assault and to beat to the ground
Your 1997 BMW 4 DR 328I Sedan is making a knocking noise and it over heated once what could it be?
my 1995 BMW 325i is making a knocking noise after i replace the water pump
Why does the air conditioner in RV start making a knocking noise?
your face a bru
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probably broken bearings
Where does the phrase put your foot down come from?
The phrase "put your foot down" likely originated from the action of stepping firmly on a car's accelerator pedal in order to increase speed or assert control. It has since evolved to mean taking a firm stand or making a decisive decision in various situations.
When you are changing gears in your 98 camaro it starts knocking and making banging sounds what do you do?
get a new trany or rebildit cuz its going out unless the knocking is from moter it might be timing
Why does the rear end of your 1999 Subaru Outback Legacy sound like its knocking?
i don't know if it helps, but my '99 legacy outback was making a knocking sound. turned out that the oring on the brake caliper pin had worn out, and the pin was kind of knocking around.
Condensing unit for heat pump unit making knocking noise What causes my heat pumps condensing unit to making knocking noise?
There could be loosened internal mounts (connecting rods, pistons, pins, crankshafts or other related parts) in the compressor causing the banging or knocking noise. A simple call to a technician should resolve the issue.
Your car is turned off and it is making a knocking sound What is the problem?
open the trunk and let your spouse out.
2002 trailblazer when you accelerate it makes bad knocking sound?
IT is your CV Joints which is making this noise.
What causes a knocking sound when you are making a turn at low speed?
Could be a worn CV joint
