Case Book: TRack down the problem

[joshwa]

It's a Toyota Avensis, and the car mats don't actually clip to the floor, so they've slid under the accellerator pedal, thus stopping the driver from revving the engine fully...

[Howard]

LOL Josh that's a very good point, something might be stuck under the pedal or in the throttle body itself

[Zak33]

Sounds gearbox related to me.

It wont rev propery even in neutral. It feels restricted somehow.

[Zak33]

timing chain / belt out by a notch? sounds like its not timing right

Nope the timing belt is fine. It's not out of alignment and was not touched on the service.

[Zak33]

It's a Toyota Avensis, and the car mats don't actually clip to the floor, so they've slid under the accellerator pedal, thus stopping the driver from revving the engine fully...

a good thought, but he checked the throttle opening earlier that day with his mate (see previous post)

[Howard]

Any fault codes showing up?

[Zak33]

nope. None

[Howard]

So if you floor it in neutral it doesn't immediately shoot up to the redline like normal? Sounds fuel or ignition related

[Zak33]

It shoots up to about 5k but then slows where it used to get faster to the redline.

When yuo drive it, it just wont rev under load at all. The old red line was high, way over 7k but now it wont get there. It has been like it since its service and got worse & worse within days of the service.

[fraggie]

spark leads? if they are worn they may not allow for a proper spark (mind you it would be missing then)

theres no easy way of telling but it might be a bent conrod due to water compression? is there any tapping?

Perhaps the fuel is not being put in at proper pressure, try the fuel pressure regulator?

[joshwa]

Have they put the wrong viscosity oil in? 10/40 when it should be 0/30 or 5/30 etc?

[Zak33]

spark leads? if they are worn they may not allow for a proper spark (mind you it would be missing then)

theres no easy way of telling but it might be a bent conrod due to water compression? is there any tapping?

Perhaps the fuel is not being put in at proper pressure, try the fuel pressure regulator?

Leads are fine

The Regulator is a very good idea. It is replaced and it doesn't help but it was a great idea

No tapping, and it's not had water ingress, so con rods are fine

[fraggie]

no fault codes would suggest that the sensors are all working correctly so were looking at something mechanical.

Before we go there though check the crank sensor, oh and just check for me that it is well earthed (all of them) and the battery is in good condition?

On those avensis's is it fly by wire or an actual throttle cable? perhaps the throttle sensor is dodgy if its fly by wire. Are there any leaks at all? (be it coolant petrol or oil)

[digit]

Has the fuel pump been checked? Perhaps its faultly and not pumping petrol to the engine fast enough?

[joshwa]

Have the "cheaper" (dodgy?) garage that serviced it de-tuned it so that he has to go back numerous times to get it fixed?

[Skii]

wrong petrol type ? runing normal unleaded and should be the pricey stuff ?