Knocking Noise From Top End

boostedsuby · 06-21-2005, 05:24 AM

I have another post about dist wires, but here's another question: When the engine was running (before my bro-in-law sold it to me) there was a knocking sound coming from the valve cover area. My brother swears its a rod, but the noise is definitely up high. Does anyone familiar with Supras know what I might check before resorting to yanking the engine and checking the bottom end?? Thanks again.

mrnickleye · 06-21-2005, 06:20 AM

Is it a light tapping sound? = valve adjust......
Piston slapping the walls ???

Rod knocks, (bearings) sometimes can be made to sound up by lightly playing with the throttle. Barely increase and decrease the rpm a little bit, if it gives a rattle sound, it could be a rod bearing. Pull spark plug wires, one at a time, and ground them. If the sound stops on a certain cylinder, its that one bad.

boostedsuby · 06-21-2005, 03:18 PM

It doesnt sound like piston slap. We did pull a plug wire (before the wire chopping) and found the source. The fact that the noise goes away then is the reason my brother thinks its a rod. Im unconvinced. The sound is up high. I put my ear next to the valve cover (drivers side) and can distinctly hear it there. Nowhere else. Does anyone have any guidance on adjusting valves on these cars? I didnt know lash could be adjusted on them. Im trying to avoid buying a manual until I know whether to keep it or not. Call me cheap....Anyway, thanks.

ddmcse · 06-21-2005, 03:23 PM

there are manuals online

http://www.cygnusx1.net/supra/library/TSRM/index.html

KingDiamond · 06-22-2005, 05:44 PM

Does it make the noise constantly no matter what, if it doesn't do it all the time, does it do it under load, when your actually driving the car. Does it do it if you just raise the rpms up from under the hood?

boostedsuby · 06-24-2005, 04:10 AM

The knock is always present. At idle and revving. It does go away when the plug wire is removed and only then. It did quit briefly when the previous owner had it for about 2 minutes when he started it, but came back. Thanks.

06-21-2005, 06:20 AM	#2
mrnickleye 1000whp postwhore Join Date: Jun 2005 Location: Mojave Desert, Calif. Posts: 1,705	Is it a light tapping sound? = valve adjust...... Piston slapping the walls ??? Rod knocks, (bearings) sometimes can be made to sound up by lightly playing with the throttle. Barely increase and decrease the rpm a little bit, if it gives a rattle sound, it could be a rod bearing. Pull spark plug wires, one at a time, and ground them. If the sound stops on a certain cylinder, its that one bad. __________________ Had a Red 1989 N/A. Automatic. Sports Pkg. w/wing. TEMS, and some nice MODS. Sold to a friend 10/08/08.

06-21-2005, 03:23 PM	#4
ddmcse 500whp yet? Join Date: Jun 2005 Location: CT U.S.A. Posts: 966	there are manuals online http://www.cygnusx1.net/supra/library/TSRM/index.html __________________ 300+ RW HP Dyno run, jdm,mod turbo,3"exh,electfan,greddyboost Blown HeadGasket info My Supra KiXGaS

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
engine knocking	red_armie_soviet	Non-Generation Specific Questions	1	09-28-2007 10:06 PM
Potentially buying 1987 Supra Turbo with knocking noise	saturnvii7	MKIII Supra	3	04-24-2007 05:59 PM
Terrible noise from the Drivebelt area	94TT	MKIV Supra	2	12-04-2006 12:29 PM
HELP! My engine just started a weird noise...	idoke	MKIII Supra	12	10-05-2006 05:06 PM
help on knock knock noise	Guest	MKII Supra	3	05-31-2005 07:41 PM

06-21-2005, 05:24 AM	#1
boostedsuby Stock Join Date: Jun 2005 Posts: 6	I have another post about dist wires, but here's another question: When the engine was running (before my bro-in-law sold it to me) there was a knocking sound coming from the valve cover area. My brother swears its a rod, but the noise is definitely up high. Does anyone familiar with Supras know what I might check before resorting to yanking the engine and checking the bottom end?? Thanks again.

06-21-2005, 03:18 PM	#3
boostedsuby Stock Join Date: Jun 2005 Posts: 6	It doesnt sound like piston slap. We did pull a plug wire (before the wire chopping) and found the source. The fact that the noise goes away then is the reason my brother thinks its a rod. Im unconvinced. The sound is up high. I put my ear next to the valve cover (drivers side) and can distinctly hear it there. Nowhere else. Does anyone have any guidance on adjusting valves on these cars? I didnt know lash could be adjusted on them. Im trying to avoid buying a manual until I know whether to keep it or not. Call me cheap....Anyway, thanks.

06-22-2005, 05:44 PM	#5
KingDiamond 12psi boost Join Date: Apr 2005 Location: West Milford, NJ Posts: 357	Does it make the noise constantly no matter what, if it doesn't do it all the time, does it do it under load, when your actually driving the car. Does it do it if you just raise the rpms up from under the hood?

06-24-2005, 04:10 AM	#6
boostedsuby Stock Join Date: Jun 2005 Posts: 6	The knock is always present. At idle and revving. It does go away when the plug wire is removed and only then. It did quit briefly when the previous owner had it for about 2 minutes when he started it, but came back. Thanks.