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a light tapping noise is quiet normal .Use a flushing oil before you change the oil and filter.then use 10/40 semi synthetic(as recc by VW)when engines at operating temp run at 3500 fo 30 secs,this will "charge" the hydraulic tappets,a cold engine has a valve rattle for about 15/20 secs but if longer then cam followers faulty.normally at 120,000m(roughly)
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It sounds like the hydraulic lifters are bleeding down after sitting for a while... there are ball checks which are supposed to prevent this... Try using a good engine flush (a product that frees sticky lifters) and replace the oil with a good synthetic... Hope this helps...;-)
i have a 1997 Golf GTI 2.0 liter engine the motor was replace and has 40,000 on it but the body has close to 150,000 on it everytime i shift 1st to 2nd somethings hitting the ground somewhere and secondly the intake maniflold has like a rattle in it or something of that sort and i dont know where its coming from its sounds like a missfire but im not 100% sure yet can someone help me and oo and 4th and 5th gear the clutch makes a biut of grinding noise like not loud and only when your fully in gear and the clutch is all the way out any ideas
for the sake of cheap expense could be worth renewing the engine management coolant temp sensor as could be faulty and not telling computer more fuel needed when cold or if have means of a multimeter being handy then check resistance between pins 1 and 3 and measure resistance readings should be approx at a temperature of 10.c between 3350 to 4400 ohms at 20.c between 2250 to 3000 ohms and at 30.c between 1500 to 2100 ohms.Also check resistance of intake air temp sensor between pins 1 and 2 and should read similar to the figures above at them temps too. Hope this helps.