Flat Spot

[Donaldiesel]

Hi,
My Peugeot 305 S5 (XU5S engine) has a bad flat spot about 3000 revs and poor acceleration. I have cleaned the plugs and twin choke carburettor, checked the timing & compression(good) and checked for air leaks, but with little difference.

This weekend I checked the valve clearances and they were all wider than spec. I also noticed that the cam tips came to a shallow 'V' point. Does this indicate a knackered camshaft? Also, would this explain the symptoms I describe?
Regards,
Donaldiesel

[madrat]

Have you tryed rebuilding the carb, somtimes they get a bit tired espeshialy if its a solex. somtimes as the engine moves as you rev it a gap can open in exhasust manafold/system and cause probs. Also could be a distributer advance problem could cause the problem, sticky weights week springs, leaky vacume advance, worn shaft etc. As for the valves I wouldnt wory too much, whats the mileage? just adjust the clearances and compare cam loabs to pic of one in Haynes manual and see if ther is much differance.

[cido]

did you check ot the amount of air that came along with the essence? mostly a bad acceleration is caused by not enough or to much air intake into the carter room !