Loss Of Power To Wheels Over 4000rpm

[johnkg]

Had a quick search but couldn't find anything obvious.

 

Car drives fine in all circumstances except if I have to rev over 4000rpm. If I hit this magic number, or somewhere just over it, the car slows, as if its no longer making the wheels go round (technical B) explanation), ease off accelerator and all is fine again. The revs don't drop, just the power to the wheels.

 

Can't reproduce when stationary as the car seems quite happy to rev that high.

 

R-Reg 2.3 petrol 120000 on the clock.

 

Thanks in advance

 

John

[cyborg]

am thinking throttle position sensor

or something more basic the variable exhaust valves are sticking open on the exhaust at high revs because the oil is the wrong viscosity or is old sticky sludge either way , it would need an oil change .

Edited August 3, 2009 by cyborg

[johnkg]

cheers cyborg,

 

I'll get it checked it out. Will post back when resolved...

 

John

[mk2vr6]

if the engine is hitting 4k and above with no load then I would look at a drive train problem? is it a slush box or a manual?

[big_kev]

if the engine is hitting 4k and above with no load then I would look at a drive train problem? is it a slush box or a manual?

 

Manual

[mk2vr6]

in that case why are we jumping straight to major engine componants when we should looking at where the loss of drive is occuring? start with the clutch, if the engine is revving ok with no load in theory it should be ok under load! the main link between the engine and gearbox and the weakest link that fails with age is the clutch and its operating parts! so get it checked out first before we strip down the head!

[big_kev]

Manual

 

Or automatic.......one of the two !

[johnkg]

Hi again,

 

Well just to add mystery into the mix, dropped it off at the garage this morning and they phoned me this afternoon to tell me they could find no fault! They did say something along the lines of 'there was a fault code from the MAF(?) which we reset but didn't think that was anything to do with it'. Told me to bring it back it if it happened again. They didn't charge me either.

 

So, I took it took for a spin and sure enough no-probs even over 5000+ rpm, though I did notice that you can hear a whine kick in over 4000rpm.

 

Can't really add anything else, but I'll post again if it starts playing up. I'm off on hols with it soon so that'll add a fair few hundred miles to it.

 

btw, it's a Manual ;)