Hi all. My RR P38 has recently, and quite suddenly within the space of a week, developed a backfiring / mis fire problem. I think it's more a back fire than a misfire.....as you hear the noise of it back though to the large air scruber filter box. So firstly, am I correct in thinking it's a back fire, not misfire???
In any event, the firing problem seems to be mildly present even on tick-over.....but the backfiring becomes more serious at a certain throttle rev range?...and is enough to make the vehicle judder. The problem came to light last week on a very damp and wet day (remember all the rain we'd been having!!) and as I was accelerating away (doing a rolling start off blocks on the M6 TOLL plaza...as you do with a V8!!!!!!) it started playing up.
I took it easy and limped home, and I've since checked usual things like plugs and plug leads for secureness or dampness, and that all viseable electrical connections look ok, and that all viseable 'air intake' related hozes and pipework look ok. Which they all visually look ok and secure. I've had some friends tell me that the symptoms sound like something really serious and expensive like maybes a burnt exhaust valve or broken air-meter sensors etc. Has anyone out there come across similar probs, and / or can offer any advice.
Cheers, John-o.
SIII 88 County RR Classic Vogue RR P38 4.6