sticky valve

[Jazmac]

After the useful help from u guys about my post on my stuttering impreza i had it down for a diagnostics at a mates garage in dumbarton, no fault codes what so ever were logged on the onboard com. However what he feel what was wrong was a sticky valve in one of the cylinders,after he took a suction test from the small air pipe from the manifold infront of the turbu unit. the instrument needle confirmed his thoughts as it jumped about and was not stable, so he sucked some forte injector cleaner straight into the pipe and the rest in the tank, and told me to rip the arse out the motor to try and free the valve, and to conduct a pressure test on the valves when i got home, which i done, Valves 1,3,4 were reading approx 160psi and 2 was less than 55psi, so there is my problem, i just hope a couple of days driving will free the valve, if not its a strip down job for me. Does any one have a link or diagrams for removing the cylinder heads, as ur prop aware there are no manuals about to buy???

[jamie_wood]

Stuck Valve ?? Hmmmm

<< Valves 1,3,4 were reading approx 160psi and 2 was less than 55psi >>

Take it you meant Cylinders???

Is there any "tapping" from No.1 cylinder??

Dont suppose you have had the rocker cover off and checked for a broken spring/bent valve/damaged rocker???

Whats the history of the car? Have you just bought it??

Had any timing belt work or recent engine/box work done??

I would be tempted to pull the rocker cover off and check the cam/rocker/valve movement.

If your valve is stuck down a little then there will be other signs too.

Ps, I wouldnt "rip the arse out of it" until more testing had been done

[wilky]

There ye are! My son will square ye awa!

[Jazmac]

nope not stripped anything as yet, only the plugs and and leads trying the easy stuff 1st, yeah i mean the cylinders. I think the pressure test on No 2 cylinder says thats the main fault, but just need to take it stage by stage to find the exact fault within, the car i have had for a year, full service history, 77k, my98. was just about to bookin for a service when the turbo went 3 weeks ago and now this so service has had to wait, no other mod or engine work has been carried out while i have owned it apart from a back box and a dump valve and other cosmetic styling,the service will need to wait untill its running rite, the thing is that the warranty ran out just a matter of 5 weeks ago, kick in the balls i'll tell u, but thats the way these thing always happen.

[jamie_wood]

What happened with the turbo??

Did it break up?

[Jazmac]

was heading home from work oneday stoped at lights and there was no power car topped out at 65 and took a day and a week to get there,took off the turbo and stripped it down to find the brass bearings in the core wore away and inturn wore away the turbinre and compressor blades off the side of the aluminium and cast outer cases due to the extra play from the worn bearings, no real damage to outer housing, bought the centre section complete and balanced from AVS turbos in england for £430 inc vat.

[tino]

Wouldn't recomend anyone 'ripping the @rse out of it' with a sticky valve. If it sticks at the wrong moment it will hit the piston...adios muchachos!! If the valve is bent don't run it as it will eventually snap due to the repeated sideways loading.

[johns]

If you've got low pressure in one of the cylinders, then ripping the a**e out of the car could only do more damage than good.

From the sounds of things it could be a piston ring, in which case it's probably advisable to take the car to a garage/dealer that knows about the cars and can do a proper diagnostic test on it. If it's something like a faulty injector, then best too to get this seen to asap (though you could swap these over yourself to see if the problem moves to another cylinder).

There are workshop manuals available to download from the internet somewhere if you look hard enough, though please note that they are copyrighted material.

John

[Jazmac]

The car is off the road and wont be driven untill fixed, all test have been done and its either a burnt valve or a piston ring, either way the RHS cylinder head has to come off, i have 10 cars in my family at the moment and many in the past have been bought and sold, not one of them ever hits the garage they just screw u over parts my be fairly priced but the labour is just OTT, my pop and i do all our engine repairs and requirments with the cars. we have a good kitted out garage at home.