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I NEED SOME ADVICE,
I REPLACED THE STARTER AND THE FUEL FILTER THIS WEEKEND AND THATS IT. NOW WHEN I START THE OLE 86 I GET A TERRIBLE RATTLE SOUND FROM UNDER THE CAR AT IDLE AND NOW WHEN I ACCELERATE IT DOWN SHIFTS BUT NO PICKUP ,FEELS LIKE IT HAS NO POWER AND I GOT A SLIGHT "EGG" SMELL FOR A SECOND.
THE CAR IDLES FINE BUT NOW POWER UNDER WOT
I just noticed the air pump hose has came loose from the converter.
The car operates fine under normal conditions but at wot feel like no power
a bad converter perhaps??????
I'm not sure if your car has 2 pre cats and the main cat (the one with the air pipe). Clogged cats could be the issue but those things don't usually go bad over night. If you want to swap it out I have a brand new never been used High Flow cat converter posted in the C4 parts for sale section for a great price.
I'm still leaning toward the fuel pressure check first. Get a hold of a fuel pressure gage and check the pressure at idle and leak down times with the key off.
The rattle and egg smell definetly sounds like the cat, and it would also cause the performance issue you're describing.........my money is on the cat.