16v - No Power - Help

[neilc]

Right my Mk1 Clio 1.8 16v has been playing up for ages now and if I cant get any ideas from here I am going to have to bite the bullet and pay Renaults super high prices to have a look :(.

The car tick overs fine but when driving it hard there is no top end power, like all the torque has gone. It hits a wall most of the time at about 5k and just splutters and stops reving, some times it even does it lower down.

Like the car is over fueling or something.

So far I have changed.

Water pump (then all of the above started)
TDC
Coolent sensor (white square one)
lamber
fuel pump
fuel filter (couple of months ago)
throttle pretensionometer (second hand)
ECU (second hand)
new plugs
Idle control valve (second hand and cleaned)
dizzy cap, arm, leads and coil have all been tested and have been told they are fine.
also tried a second MAP sensor and checked all the pipes

and still after all that, no change :(

any one have any ideas ??

[Andyvalver]

I had the same problem as you a while back. Mine used to hit a brick wall at 5k then it got worse and was idleing all over the shop and sometimes it cut out and wouldnt start. I replace alot of stuff like you have. The one day i decide to take off all eaths and sand them shiney and bolt them back on super tight. Its been fine ever since. Your problem could be an earth. Clean up the box earths and the earth straps

[Mattie]

tryd cleanin your throtle body m8?

[neilc]

already done that :(

ps. couldnt beleve how many earths there were lol

[neilc]

tryd cleanin your throtle body m8?

Carb cleanerd it to death

[Andyvalver]

Sounds silly but even a piece of grit under an earth connection can **** up the running of your car.

[neilc]

I will give them another look just to be sure.

[matty]

Checked fuel filter and also tried any fuel system cleaners like Forte? My valver always seems to go better when its had its regular 6000 mile dose of Forte or similar and fuel filters often get neglected.

Have you run out or petrol recently causing crap from bottom of tank to get into fuel lines etc?

[neilc]

I had the fuel pump replaced and pressures check out.

Always run on Optimax aswell.

[kj16v]

Valvers' designed to run on 95 RON. IMO The only benefit of running Optimax is to Mr. Shell's wallet!

What about the injectors? On other cars I've used Gunsons Colour Tune to pinpoint what's going on in the engine. Really useful for checking for fuel or spark problems.

Marybe a leak in an inlet-side gasket. Sometimes you can't hear them.