Tapping noise
November 9th, 2009, 10:11 AM
#1
CF Beginner
Thread Starter
Join Date: Nov 2009
Posts: 12
Likes: 0
Received 0 Likes
on
0 Posts
Tapping noise
Hi all,
It is probably a general question about 4.3 engine.
I have 98' Astro with 200000 miles on it. It was developing a tapping noise that could be heard on transition from high revs to idle. A few days ago I started it in the morning and I heard this didtinct tapping noise, which sounded like a lifter to me. It desappeared as engine warmed up. I drove the van for couple of days and that noise never came back. Yesterday I was driving it as usual and after one stop that noise came back when I started it hot. It would disappear after a few minutes of driving. also I noticed that when it knocks the oil pressure is all over the map - low at low rpms, and tops up at higher rpms. When noise stops - the pressure is in the middle at all rpms. Any suggestions before I rip it apart to change the lifters?
Thanks in advance.
Also my coolant disappears, oil level is OK though, and no traces under the vehicle.
It is probably a general question about 4.3 engine.
I have 98' Astro with 200000 miles on it. It was developing a tapping noise that could be heard on transition from high revs to idle. A few days ago I started it in the morning and I heard this didtinct tapping noise, which sounded like a lifter to me. It desappeared as engine warmed up. I drove the van for couple of days and that noise never came back. Yesterday I was driving it as usual and after one stop that noise came back when I started it hot. It would disappear after a few minutes of driving. also I noticed that when it knocks the oil pressure is all over the map - low at low rpms, and tops up at higher rpms. When noise stops - the pressure is in the middle at all rpms. Any suggestions before I rip it apart to change the lifters?
Thanks in advance.
Also my coolant disappears, oil level is OK though, and no traces under the vehicle.
Last edited by Aviator5; November 9th, 2009 at 10:38 AM.
November 11th, 2009, 9:57 AM
#3
CF Beginner
Thread Starter
Join Date: Nov 2009
Posts: 12
Likes: 0
Received 0 Likes
on
0 Posts
No bubbles in the rad, and no white smoke. This morning was cold and that tapping noice was really pronounced, it muffled down quite a bit after motor warmed up. But comes back if I shut down for a while or idle it for a while.
Thread
Thread Starter
Forum
Replies
Last Post
