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ionMr. Hugo. what to what you do have is the viscosity of your engine oil. Most probably is either long mileage used engine oil and due to that oil mud built up inside the engine, in the oil pan and most likely close to the oil pressure pump filter reducing the suction and that is why you do have cold lifter knocking,as the engine oil that time is thicker and when it gets hot become thinner and lifters stopped knocking. My persona advise do flush the old engine oil using ( RESTORE MOTOR CLEANER ) pour it into the engine old oil,start the engine in idle and few times reving it for 40 minutes. Then drain it and renew the engine oil with new and recommended engine oil for your engine,by renewing the oil filter as well. Also in the new engine oil put also (RESTORE FRICTION REDUCER ) additive and run the engine.For next oil change please do it every 5000 km ( 3000 miles)
Lissa, Hate to deliver the bad news, but it doesn't sound good... One of the simple things you can do is to check the oil and see what it looks like, if it is foamy, you got water in to the oil and a major expense. the nest woudl be to have a compression check done, it shouldn't take a good mechanic but a half hour to diagnose and estimate. Best regards, Ck
It's a common problem with these cars i am actually fixing mine as of now. That car is all about oil pressure and when it is low you'll start to get a tap and or what sounds like a knock due to the lifters not having enough pressure. Try taking your oil pan off and check your oil pick up line going from the oil pan to the turbo. A lot of times it gets a lot of sludge build up and makes the pressure little to none. If that looks clear check the slump inside the oil pan and see if that has sludge build up. Well hope this helped
depending on the noise, I know the 3.4 had a TSB out for excesssive piston to cylinder clearance, which would cause a light knocking noise on cold start. On the other hand it may be loosing the prime on the oil pump. Kinda of hard to say exactly with actually hearing it. ; <
Knocking can be a symptom of worn engine bearings, a worn wristpin on a piston or piston "slap" Engine bearing problems cause low oil pressure and are serious. Lifters can also become noisy from an internal malfunction or wear, sometimes they can become noisy with low oil pressure which is related to either bearing problems or an obstructed oil pump screen. Servicing the lifters in that case will not fix the problem. One other cause of knocking is a cracked flywheel (cracks usually are between crankshaft bolt holes and require trans removal to actually see the damage) Diagnosis begins with removal of the oil pressure sending unit replacing it with a mechanical gauge so actual oil pressure can be determined. This, along with the ear of an experienced technician will make the diagnosis complete. Obviously, the repair depends upon the tech's findings.
Change oil and filter. Use a synthetic blend oil, add 1/2 pint of marvel mystery oil, and drive for a short time, 30 minutes or so. If knock continues, the damage is already happened. Use only synthetic blend or synthetic oil in the 2.7 litre engine.