Loud tapping noise passenger side 3.1L
#1
Junior Member
Thread Starter
Join Date: Sep 2008
Location: San Diego
Posts: 18
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1991 Pontiac Firebird
Engine: 3.1L V6
Transmission: 700r4
Loud tapping noise passenger side 3.1L
So I bought a 91' firebird and it had a slight knock after it was fully warmed up. I pulled the intake manifold to see if it was a lifter, valve spring or rocker arm and all of those were fine. Everything's back together and now when I start it up it makes a loud *** tapping noise that sounds like it's coming from the upper passenger side of the engine. Any ideas? Also, would a bad exhaust leak have anything to do with this *** **** noise?
#2
Senior Member
Join Date: Jun 2006
Location: Desert Heat
Posts: 503
Likes: 0
Received 0 Likes
on
0 Posts
Car: 90 RS/90 Z-71/73 Vega
Engine: 3.1/5.7 TBI/5.7
Transmission: 700R4/700R4/350turbo
Axle/Gears: 3.23/3.42/3.42
Re: Loud tapping noise passenger side 3.1L
since you didnt get any replys..maybe give us a little more info.Like did you adjust/remove/install anything when you had the intake off or V/cover off?.I would guess its misadjusted valve lash...it also sounds like you might have a collapsed lifter...meaning one or so lifters isnt pumping up.You could try an additive or thicker oil and see if it gets quiet or to a lesser degree of noise to kinda narrow it down.
#3
Member
Join Date: Dec 2007
Posts: 115
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1991 firebird/1990 firebird
Engine: 3.1
Transmission: 700R4
Axle/Gears: 3.23:1
Re: Loud tapping noise passenger side 3.1L
I have a simmilar noise (sorry cant say same without hearing yours) on my '91 3.1 and it's a loose wrist pin. It sounds just like a lifter/valvetrain noise except when you tap the throttle it changes frequencies.
#4
Senior Member
Join Date: Jun 2006
Location: Desert Heat
Posts: 503
Likes: 0
Received 0 Likes
on
0 Posts
Car: 90 RS/90 Z-71/73 Vega
Engine: 3.1/5.7 TBI/5.7
Transmission: 700R4/700R4/350turbo
Axle/Gears: 3.23/3.42/3.42
Re: Loud tapping noise passenger side 3.1L
Very true fictmich...it could be that too..I had a 68 bird with a piston pin tick and it would go away with a additive for a few weeks and then come back but I ran the crap out that motor with it making noise like that and it never blew..sold the car with it still making noise.
I wanted to add something..if I recall I pulled one plug wire at a time to narrow down the cylinder,while it was running ..the noise went away when you got to that cylinder cause there was no power stroke?.might try that
I wanted to add something..if I recall I pulled one plug wire at a time to narrow down the cylinder,while it was running ..the noise went away when you got to that cylinder cause there was no power stroke?.might try that
#5
Member
Join Date: Dec 2007
Posts: 115
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1991 firebird/1990 firebird
Engine: 3.1
Transmission: 700R4
Axle/Gears: 3.23:1
Re: Loud tapping noise passenger side 3.1L
Very true fictmich...it could be that too..I had a 68 bird with a piston pin tick and it would go away with a additive for a few weeks and then come back but I ran the crap out that motor with it making noise like that and it never blew..sold the car with it still making noise.
I wanted to add something..if I recall I pulled one plug wire at a time to narrow down the cylinder,while it was running ..the noise went away when you got to that cylinder cause there was no power stroke?.might try that
I wanted to add something..if I recall I pulled one plug wire at a time to narrow down the cylinder,while it was running ..the noise went away when you got to that cylinder cause there was no power stroke?.might try that
That's one way to find the bad cylinder. Just don't pull the wires while it's running unless you want to get shocked.
#6
Member
Join Date: Oct 2007
Location: Marengo,IA
Posts: 484
Likes: 0
Received 0 Likes
on
0 Posts
Car: 89 Firebird
Engine: 2.8L out of a 89 camaro
Transmission: 5 speed
Axle/Gears: ?
Re: Loud tapping noise passenger side 3.1L
use rubber insulated gloves.. the good rated ones.. 10k volts or so..?
#7
Supreme Member
Join Date: Oct 2001
Location: NWOhioToledoArea
Posts: 8,113
Likes: 0
Received 5 Likes
on
5 Posts
Car: 86-FireBird
Engine: -MPFI
Transmission: T5
Axle/Gears: 3:42
Re: Loud tapping noise passenger side 3.1L
Get it warm where it does that, then park somewhere dark dark dark and pop the hood.
Trending Topics
#8
Re: Loud tapping noise passenger side 3.1L
definitelly exhaust manifold gasket...I had the same problem....figure out which one is louder and cahnge it or just do both at the same time
Make sure you use a lot of PB blaster when taking nuts out....ITs really hard to drill them out if you break the studs...(because there isnt much room under the hood)
Make sure you use a lot of PB blaster when taking nuts out....ITs really hard to drill them out if you break the studs...(because there isnt much room under the hood)
#9
Junior Member
Join Date: Feb 2009
Location: Virginia Beach
Posts: 70
Likes: 0
Received 0 Likes
on
0 Posts
Car: Camaro RS
Engine: 3.1l v6
Transmission: 700r4
Thread
Thread Starter
Forum
Replies
Last Post
corlando52
Interior Parts Wanted
0
08-24-2015 11:32 AM