Renault Laguna lack of power and starts splutering after 4 thousand rpm

Car: Renault Laguna
Variant: 1.8 rt sport man
Model Year: 1999
Categories: Running Rough, Starting & Power Loss
the car has a big loss in power and seems to have even less at higher revs, often starts to spluter after 4 thousand rpm but up to then is quite smooth, it sounds quite loud as if the exhaust is blowing but it passed an MOT like that, it starts first time every time and ticks over smoothley for 20-30 seconds and then the revs seem to drop and rise very slightly. its been like thisfor several months and hasnt got any worse or better, gave it a service with plugs oil oil filter air filter and 10K boost with no change, the cars done 158,000 miles, is it just at the end of its life? please help.
Posted: Aug 11, 2010 (14 years ago)
Checked compressions ?
Posted Aug 11, 2010 (14 years ago)
get compression test done head gasket may be going
Posted Aug 11, 2010 (14 years ago)
Hi berty did you find the problem as mine is doing similar. Is beuatiful on the motorway but increase the revs especially in lower gears and it is very hit and miss and is now really tugging back all the time

Cheers
Posted Oct 10, 2010 (14 years ago)
hello had car to the garage on diagnostic and it didnt come up with anything had a look and the flexy part at the bottom of the manifold/top of cat was moving alot under acceliration and he suggested the cat was blocked. took the cat off and it now works fine. new cat cost about £80
Posted May 29, 2011 (13 years ago)

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