Engine Tapping
06-19-2012, 07:33 AM
#41
Senior Member
Join Date: Dec 2011
Posts: 344
I switched my engine to full synthetic at 140,000 miles (currently at 146k, was given to me at 136k) after it had been run on conventional for its entire life before that (my mother was the original owner up to that point). This is also taking into account that she had run it almost completely out of oil once in the car's life (luckily I had caught that mistake before it led to a major problem). As soon as I got the major work that needed doing to the car (full exhaust, suspension, etc) I switched it over to full synthetic... on my second oil change since switching and it just keeps running (and sounding) better and better the more the sludge keeps getting worked out. The extra power is nice also. 
06-19-2012, 12:03 PM
#43
Senior Member
Join Date: Feb 2009
Location: Columbia SC
Posts: 2,284
[QUOTE=asand1;8030395]Not sure on that one. Does the knock come with the light every time? Is it an even knock, or or is it funky rythm (same two or three cylinders)? Does it sound like its deep in the crank case, or in the heads?
Two possibilities that come to mind are oil pressure reliefe valve, or main bearing
sometimes spinning and
blocking off oil galley to crank.[/
QUOTE]
I had a 91 chevy beretta v6 that had a similar issue. I started it up one day n all i got was a tapping noise like it wasnt gettng enough oil or the oil pump had blockage. Drove it around to try and build up the pressure. And the tapping stopped, then it came back, and it would do it bak and fourth. Mechanic said the oil pump was dying. Putting some heavyweight oil in the engine helped a little to buy some time. But eventually i ended up blowing the engine from oil starvation(oil pump died.
Two possibilities that come to mind are oil pressure reliefe valve, or main bearing
sometimes spinning and
blocking off oil galley to crank.[/
QUOTE]
I had a 91 chevy beretta v6 that had a similar issue. I started it up one day n all i got was a tapping noise like it wasnt gettng enough oil or the oil pump had blockage. Drove it around to try and build up the pressure. And the tapping stopped, then it came back, and it would do it bak and fourth. Mechanic said the oil pump was dying. Putting some heavyweight oil in the engine helped a little to buy some time. But eventually i ended up blowing the engine from oil starvation(oil pump died.
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