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  • 1996 - 2004 SN95 Mustang -General/Talk-
  • SN95 4.6L Mustang Tech

Cant figure this out

  • Thread starter Thread starter 99gsx
  • Start date Start date Mar 28, 2010
9

99gsx

New Member
Mar 28, 2010
2
0
0
Mar 28, 2010
#1
  • Mar 28, 2010
  • #1
I have a tapping noise coming out of my engine. It is there %100 of the time but gets loud once the engine heats up and gets louder as the rpms increase.
I checked for loose plugs, loose chains, bad lifters, I thought maybe the head might be messed up so I swapped heads (had an extra set). There isnt any metal in the oil, the oil isnt low, there isnt an exhaust leak from the head-headers, there isnt anything that fell into my oil pan, its not a pulley hitting anything. I had a compression check done and there all the pistons read pretty much the same. Im stumped.
Im gonna take a video tomorrow and post it as well.
 
E

e8597cobra

New Member
Mar 7, 2010
17
0
0
lancaster pa
Mar 28, 2010
#2
  • Mar 28, 2010
  • #2
k i have had a 4.6 sohc in the past. i had the thing blow on me going down the highway. my problem was the timing chain guides. they wear out after a bit and the chain slaps ageist them. they are made of plastic and are held in by 2 10mm bolts, also there are chain tensioners that also go bad but the taping started off soft then grew louder over time i hated the block so i ran it to the ground. i would look there first if all else fails there is always the oil pump in the front but i doubt that's the problem. and worse case is it could be the piston slap or a internal problem. i will watch the vid when you put it up its really hard to diag a car when you cant see it lol.
 
9

99gsx

New Member
Mar 28, 2010
2
0
0
Mar 28, 2010
#3
  • Mar 28, 2010
  • #3
Im trying to upload a vid but it wont let me upload vids off my phone. Im gonna try and get a video camera. If it is my chain guides couldnt I just take them out?
 

trinity_gt

10 Year Member
Jan 31, 2003
3,125
81
99
Canada
Mar 28, 2010
#4
  • Mar 28, 2010
  • #4
Rod bearing.
 

nyuk98gt

15 Year Member
Oct 10, 2000
1,427
6
79
Chesterfield, MO
Mar 28, 2010
#5
  • Mar 28, 2010
  • #5
99gsx:

Chain tensioners?

When did the knocking start? Was it right after a WOT run? Has the oil level ever been low? More details, please. (Let's hope it is not rod knock but trinity_gt might be onto something.)

Chris
 
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