2000 S-type,v-8(Ford Engine)Has anyone heard excessive engine noise just from using regular fuel instead of premiem?

 

What are we talking about. Is it knocking or pinging? If you want the same performance as when using premium gas then you'll have to put the pedal down more and you'll get more intake and exhaust noise.

 

Hi Rod, for this particular question, I'd definitely post it in the specific s-type forum. General tech help is usually vague and can cross over multiple models, engine sizes, and general car questions.

good luck!

 

Jags. tend to have high-compression petrol engines, my XJ6 had 10.5:1,one of the reasons it ran so well on LPG.
Such an engine is best with fuel of high-ish octane (RON), but if you put in 'regular' or lower octane petrol, it should still run without pinking/detonation, as the knock-sensing device will instruct the ECM to retard the ignition until the pinking/detonation just disappears. If this isn't working (the sensor being the most likely culprit, or it's wire) you will get knocking, pinking/detonation. This sounds like somebody rattling a big chain under the bonnet/hood, most especially when the engine is hot and pulling hard, e.g. wide open throttle. On low loads or cold-running, there is less of this.
Of course, this is speculation. The noise you hear might be something else entirely.
I remember one contributor included an audio file of a noise he had, which we thought was loose baffles in his silencer/muffler.
Leedsman.