The first thing I'd check is the crankcase pressure relief valve (PCV) these are sprung loaded and are only meant to 'burp' excess pressure every now and then. The exiting gas is piped back to the inlet , however should the valve stick open then the engine tends to suck the air out of the crankcase all the time and this carrys oil over with it.
If you remove the air intake pipe and look inside where the crankcase breather is plumbed in you may find evidence of oil.
Hi, Matt. Thanks for reply. Have tried to find out where the PCV valve is located on TDDI engine and not even Ford Jennings, a Ford main dealer can tell me! Have you any knowledge of this engine?
Thanks Matt. I will look at the Haynes manual to try to identify what you've mentioned. Will let you know early next week if I am successful. Thanks. John
Hi Matt. Have looked at Haynes and there is no mention of a PCV for the diesel - plenty for the 4 & 6 cyl petrol engines.Could a sticking EGR valve have the same effect? Will continue to look for the valve. Thanks, John
Hi, Matt. Haven't had a chance to dismantle anything yet. How come the engine revs freely when not under load? The problem only occurs when in gear travelling at an even speed, when it fails to slow down. I've discovered there's a fault on the alternator, and it's been suggested that this could have an effect. Would you agree? I'm hoping to get a replacement tomorrow. Thanks,John
Thanks for reply. The alternator was producing an erratic charge. Have since had it checked by an autoelectrician and it's not repairable. Have just purchased a secondhand unit from a Ford specialist dismantler as I've spent enough on this motor-next car, a 3.0 ltr Tdi '55 plate Audi A4 Avant is waiting on the drive under cover but I must sell this one first! Will tell you if this repair works. Thanks,John
Tried to change alternator but couldn't slacken belt enough! - 5 frustrating hours! However, just travelled 15 miles and the problem didn't reoccur! I obviously removed the 3-pin connector and sprayed it with electrical-cleaner before reconnecting, so possibly could have been the cause of the erratic voltage readings? Will be travelling further tomorrow so will give you an update later. Thanks, John.
Hi Matt. The tensioner on the Mondeo is accessed via a 13mm square recessed hole-only problem is that there is only 1" clearance between it and the inner wing! You either need the special tool from Ford or make one as a bloke on e-bay has. Anyway, the problem seems to have disappeared for the moment so possibly the contact had simply deteriorated with age. Many thanks for your suggestions. Next questions will probably be about the Audi! John
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