I had a 997 gen 2 so the DFI engine in for a misfire fault .. another garage had looked at it but kinda moved it on .
Fault was an injector .. no actual way of testing it though .. 3 hours of stripping parts out to get at it only to find it jammed in place and i couldn't get it out.
Also no way of testing it when half the engine is in bits .. wiring tests proved that side was ok ...Fuel pressure is 48 bar on idle with upto 230 bar at times... a little dangerous to mess about with .
Engine drop .. i had a look at the valves at this point .. lets just say i took about 20 pictures but the images below are the best i could get .
Valves are heavily covered in carbon .. to be expected when there is no fuel to " clean them " .. even so it was a bit of a surprise to see just how bad they were .
We bought a walnut cleaning machine and proceed to " shot blast them" .. end result after modifying adaptors to get the best results was pretty good ..
henry the hoover got a good workout .
Still working on a way of doing this in situ but atm we feel the " water machines " for want of a better description might be best .. not sure how well they would deal with the level of carbon this car had on it though , personally i don't think they will do a thorough clean .. maybe several attempts and then see .
A lot of work and not what the customer paid but we used him as a guinea pig to work out the best way forward as this is going to be more common we feel .
For us it's a work in progress but i thought i would share it ... we learn when we get a problem .. we find a solution as does any garage that is most cost effective .
Pictures were taken after i had removed the manifold .. the dirt you see is what you all will have ... all cleaned up afterwards though .
Anyways .. i just thought you might want to have a look .
EDIT .. right click on the images and open in a new tab ... or enlarge them to get a better image .
Fault was an injector .. no actual way of testing it though .. 3 hours of stripping parts out to get at it only to find it jammed in place and i couldn't get it out.
Also no way of testing it when half the engine is in bits .. wiring tests proved that side was ok ...Fuel pressure is 48 bar on idle with upto 230 bar at times... a little dangerous to mess about with .
Engine drop .. i had a look at the valves at this point .. lets just say i took about 20 pictures but the images below are the best i could get .
Valves are heavily covered in carbon .. to be expected when there is no fuel to " clean them " .. even so it was a bit of a surprise to see just how bad they were .
We bought a walnut cleaning machine and proceed to " shot blast them" .. end result after modifying adaptors to get the best results was pretty good ..
henry the hoover got a good workout .
Still working on a way of doing this in situ but atm we feel the " water machines " for want of a better description might be best .. not sure how well they would deal with the level of carbon this car had on it though , personally i don't think they will do a thorough clean .. maybe several attempts and then see .
A lot of work and not what the customer paid but we used him as a guinea pig to work out the best way forward as this is going to be more common we feel .
For us it's a work in progress but i thought i would share it ... we learn when we get a problem .. we find a solution as does any garage that is most cost effective .
Pictures were taken after i had removed the manifold .. the dirt you see is what you all will have ... all cleaned up afterwards though .
Anyways .. i just thought you might want to have a look .
EDIT .. right click on the images and open in a new tab ... or enlarge them to get a better image .