Re: 2000 mustang 3.8 l motor makes rattling noise when...
The 2000 ford Mustang has a factory defect. there is a missing Baffle in the Valve cover which is allowing oil to be sucked in to the combustion chamber through the PCV valve. the Fix is to install a filter or to install the new valve covers you will need to buy through your local ford dealer.
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Adding an octane booster will not cause this issue. They are designed to go into the tank. You need to check and see if the computer has any stored codes. Best guess at this point in time are cloged catalytic convertors, bad mass air flow sensor, bad map sensor, bad egr.
sometimes, different engines call for higher octane gas, look it up into your owners manual to see what grade of gas is desirable for your engine, if you don' have a owners manual, going to the next higher grade of gas will not harm . if you do decide to go to a higher grade of gas , and after driving a while, you still hear the rattling, i would have the car checked out.
you should have a factory affixed sticker inside gas compartment cover listing premium fuel only or also listed in your owners manual. Otherwise if you notice that you're vehicle is making a pinging sound while accelerating or climbing a hill for instance then you may want to step up to 89 or 93 octane and try to avoid purchasing fuel with ethanol added it's **** and degrades your fuel quality/octane ratio
Humm, give it some time. there are upper cylinder cleaners, but I worry about converter damage, and oxygen sensor damage. The lower the octane, the hotter and more masssive the burn, exactly backwards from what you would think, but higher octane is slower burn and av.gas is really, really slow.
Ford has had slow to start issues that traced back to drivers using too high octane....
Still, if it keeps pinging, you may need to run higher than spec octane.
I would have thought that your car would have knock sensor that would trim this issue...
Could be carbon build-up on the pistons, causing erratic flame travel in the combustion chamber... 'pinging'...... Decarbon the engine and use a high grade fuel for a few tanks.... also an octane booster can help