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1,6,7,8 - Series and Mini Cooper General Chat related to models that do not fit into particular categories above. Please try to put your discussion in more appropriate sections. This section does cover the 1 Series, MINI Cooper and 8-Series vehicles: BMW 830i, BMW 840Ci, BMW 850i, BMW 850Ci, BMW 850CSi, M8, Alpina B12, BMW CS Concept and others.

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Old 09-07-2010, 05:30 PM   #1 (permalink)
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1999 740i Clicking sound from engine

Ok, so all of a sudden this morning when I started my car, I heard a clicking sound comming from the engine. The service engine light is on. I took off the engine plastic cover to try and pin point where the noise is comming from, and it sounds like it is near the valve cover. Any idea what his may be? Faulty valve? The car drives fine, though I did smell some vapor odor upon starting the car. I have 156,000 miles on it.
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Old 09-08-2010, 08:44 AM   #2 (permalink)
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Is the frequency of the clicking sound linked to the revs of the engine?

Does the engine rev freely in neutral, or does it hesitate or struggle to make power?

Could it be an injector pin is stuck open/closed? Try putting the pointy end of a screw drive on each injector (in turn) and the handle end on your ear to isolate the sound, unless you have a stethescope type tool.

Have you check the oil recently?
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Old 09-08-2010, 06:21 PM   #3 (permalink)
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Just did an oil change with synthetic oil. It seemed to go away when the new oil circulated within the engine, then about 10 seconds later, the tapping began again. Yes, it is linked with the reving of the engine. It sounds like I can hear the tapping comming from the valve cover. I can almost feel the tapping too.
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Old 09-08-2010, 06:24 PM   #4 (permalink)
OMFG another one!?
 
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Could be noisy valves that need adjusting.
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Old 09-08-2010, 07:46 PM   #5 (permalink)
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It sounds like that the noise is coming from underneath the MAF into the middle of the engine, Near the water pump or just abve it.
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Old 09-08-2010, 08:31 PM   #6 (permalink)
OMFG another one!?
 
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That 4.0 V8 has a timing chain right? How about the timing chain tensioner?
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Old 09-09-2010, 06:51 AM   #7 (permalink)
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How dirty or gunked up was the oil you took out? Was it dirty enough to have blocked some of the oil paths to the valve train?
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Old 09-17-2010, 10:22 PM   #8 (permalink)
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sounds like a timing chain issue to me. usually it will have a rattle sound when you start it for the first time of the day.
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Old 09-18-2010, 01:27 AM   #9 (permalink)
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I did read somewhere of a car that had a ticking noise that ended up being the main serpentine belt missing a chunk of the grooved face, it hadn't actually failed, but it was well on its way. The way the other guy tracked the fault down was to put a mark on the belt to see if the mark was at a similar frequency to the mark flashing past. Its worth a look to see what condition you belt is in.
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Old 09-20-2010, 02:53 PM   #10 (permalink)
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Yes, it was a timing chain. It now broke and I am out of an engine. Needs to be replaced. Going to either part out the car or sell it as is for peanuts.
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Old 09-21-2010, 06:20 AM   #11 (permalink)
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Bad luck. Sorry to hear that you are parting company with it.
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Old 09-24-2010, 03:12 PM   #12 (permalink)
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You have the 4.4 V8 witch being a 1999 I reckon its the double Vanos version, so it will be the Vanos...I can explain but it will take me all night,,,Google e38 vanos..its fine to drive so dont worry..
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Old 09-24-2010, 05:09 PM   #13 (permalink)
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sorry that i was right on this one. the key word was first thing in the morning.
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Old 09-24-2010, 06:32 PM   #14 (permalink)
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You have the 4.4 V8 witch being a 1999 I reckon its the double Vanos version, so it will be the Vanos...I can explain but it will take me all night,,,Google e38 vanos..its fine to drive so dont worry..
Good to see you back Marti.
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