Guys, Need some help. After a high speed run (maxed the car out @ 300 KPH) for approximate 15 miles. I have developed a roughness with the engine. Its back firing and popping at idle and down shifting and the has lost its responsivness through the rev range. It does rev all the way but seems to be holding back. The cylinder check lights have not come on. I am getting black particulates building up on the exhaust ends. The exhaust ends used to be grey whitish deposit. The engine / exhaust note seems different to, more a a TVR sound instead of ferrari scream sound through the rev range. The car is going in a major service in the next week. I have looked at the spark plugs and they are OK but they do need changing a little worn, the spark leads are sparking and seem OK because I can hear the clicking nosie of the eletrode when you remove the lead from the plug while the car is running. Could I have a bad lamber sensor and is that same as the 02 sensor ? Maxing the car out for 15 miles could I have cooked the exhaust sensors ? I have not cats and a tubi on. The engine temperature and water temperature where fine. No smoke appearing from car on idle or while driving it. It seems to be a electrical fault somewhere. The car has never had any problems before. They car ecu's do work. When I disconnect them the slow down lights come abd go off when I connect them back up. Any ideas, much appreciated.
I thought I was going nuts! I responded to this post in the Technical Q&A and then tryed to see if the response had posted but I looked it up here...and there was nothing....thought my computer erased my post! Ahhhh.....It's late...I'm going to bed!
Had the same experience. In my case it seems to be a blown headgasket, the roughness coming from coolant which enters the cylinder. Repair is scheduled for February.
Were in the heck were you able to run it flat out for that long? And dang bro, 186 mph that is flying in 348! Who did the port job on your heads?
