Thanks for the info and support I think I will give it a try. Which intake cleaner did you use and does it matter? Also the two allen bolts on the pipe you removed are they obvious and are they near the EGR valve? I am not a mechanic by any means and dont want to start spraying solvent down the wrong pipe. Cheers
Hello Sportywagon. this is the stuff I bought. I found some at Halfords and some at a motor factors Halfords | Wynn's Fuel Injection & Carburettor Cleaner 500ml
the two allen bolts are visible at theinterface between the black plastic intake pipe and the inlet manifold, near the EGR valve. You will see the pipe, it is obvious, it is the one seems to come around the front of the radiator, and then turns up towards the n/s top of the engine.
As yoiu look into the engine bay, with the battery on the right the intake pipe comes joins with the manifold about 6 inches to the left of battery.
My manifold is plastic, not the usual troublesome alloy one, but i guess they both have issues.
I would definitely try the soak method first, for which I had to remove the battery so that I could get the aerosol level with the intake pipe. Spray the cleaner in using the thin extension tube, aiming it to the far end of the manifold and all around the insides
Probably best not using more than 1/4 of a can the first time, and leave it to stand for a while, 30 mins at least (that helps soften some deposits and lets a lot of cleaner evaporate away) . I hydro-locked one cylinder, as you read, which can be dangerous for some cars if you persistently try to turn the starter motor against it. I have heard of bent conrods happening like this, but that was on a little 1100cc petrol engine with thinned down race conrods. Still, take your time, if you go to start the engine and the starter stops turning pull the key out immediately to stop it, wait another few minutes to let the pressure down and try again.
With the engine running, at tickover, I also sprayed 1/4 can or so into the inlet pipe just after the resonator box ( the black box on the driver's inner wing, piped into the large plastic air inlet pipe).
the best results happened after soaking the inlet though. You can also spray cleaner into the inlet manifold while the engine is on tickover. The engine misfires a little bit but the spray gets pulled into the main air channels and clings to the walls in ways which can be missed just by spraying it in the manifold with a stationary engine.