Help me fix the ticking.
Thread Starter
TECH Addict
Joined: Mar 2002
Posts: 2,189
Likes: 0
From: Glendale, CA
Help me fix the ticking. Here is the most complete list of symptoms I could gather and steps I've taken to resolve them.
-The tick is audible with the hood closed while standing next to drivers side front door.
-It is loudest from underneath car and seesm to be coming from the collector of the header.
-During acceleration it ticks, but when I let go of throttle, ticking stops.
-I have done the AIR restrictor mod, but it only silenced the tick a tiny bit. I am pretty sure check valves are burnt up, and if so, will those still be fluttering and ticking?
-I have checked the spark plug wires and they are on tight.
-When i open the engine bay and listen for the tick, I can hear a very slight ticking coming from check valves, but most of the ticking seems to be coming from the injectors.
Any suggestions on where to look next? I'm pretty sure it's not an exhaust leak because i've checked the hell out of it.
Thanks all.
-The tick is audible with the hood closed while standing next to drivers side front door.
-It is loudest from underneath car and seesm to be coming from the collector of the header.
-During acceleration it ticks, but when I let go of throttle, ticking stops.
-I have done the AIR restrictor mod, but it only silenced the tick a tiny bit. I am pretty sure check valves are burnt up, and if so, will those still be fluttering and ticking?
-I have checked the spark plug wires and they are on tight.
-When i open the engine bay and listen for the tick, I can hear a very slight ticking coming from check valves, but most of the ticking seems to be coming from the injectors.
Any suggestions on where to look next? I'm pretty sure it's not an exhaust leak because i've checked the hell out of it.
Thanks all.
TECH Fanatic
Joined: Aug 2002
Posts: 1,101
Likes: 0
From: Bloomington, IN
Re: Help me fix the ticking. Maybe a bad lifter. Put your ear next to the wheel well. If it is loudest there, it is most likwly a lifter. Could be the valves slamming back in thier seat, and the sound maybe amplified by the headers. See my mods. My car ticks, but not a damn thing is wrong with it. I just have a very noise valvetrain due to the cam velocity of my cam.
Re: Help me fix the ticking. I have the same thing...noisy valve train...extrem cam lobes....and I can hear the exhaust hitting the bottom of the headers at the collector...
its a well oiled...hard runnin..fast as hell...highly tuned............sewing machine.
its a well oiled...hard runnin..fast as hell...highly tuned............sewing machine.
Re: Help me fix the ticking. BigBlack Z28. We should get together, I have the exact same sound as you have described. I need to get to the bottom of this, because it is driving me nuts and has me worried. I think it might be a bent pushrod or a bad lifter as smokeford mentioned above. Let me know if you find out what it is. Nice hood..looks just like mine. 
Re: Help me fix the ticking. Valvetrain noise does not respond to throttle
position, only RPM. If you foot-stall it, give
it gas, and it gets louder, it's an exhaust leak.
Thin-wall headers will transmit more of the
exhaust pressure pulse through the wall, making
more noise. No getting around this (except maybe
by wrapping them to muffle it). But you ought to
take a stethoscope (or make one out of a few
feet of 5/16" clear PVC tubing, stuck in both
ears; those cheapo airplane headsets work too)
and listen close to the collector flange and
the merge welds. If you don't find any leaks
then chalk it up to acoustic transmission
through the tube wall.
position, only RPM. If you foot-stall it, give
it gas, and it gets louder, it's an exhaust leak.
Thin-wall headers will transmit more of the
exhaust pressure pulse through the wall, making
more noise. No getting around this (except maybe
by wrapping them to muffle it). But you ought to
take a stethoscope (or make one out of a few
feet of 5/16" clear PVC tubing, stuck in both
ears; those cheapo airplane headsets work too)
and listen close to the collector flange and
the merge welds. If you don't find any leaks
then chalk it up to acoustic transmission
through the tube wall.
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Thread Starter
TECH Addict
Joined: Mar 2002
Posts: 2,189
Likes: 0
From: Glendale, CA
Re: Help me fix the ticking. Thanks JimmyBlue, I will try what you said.
LS1MONSTERRRRRR
so far I jsut went ahead and ordered some check valves for the AIR system as I'm sure those are toast.
If that doesn't get rid of the ticking, then hell I'll just have to live with it. That's what the sound system's for in a Chevy right? To Muffle the valvetrain noise and body squeaks and rattles?
LS1MONSTERRRRRR
so far I jsut went ahead and ordered some check valves for the AIR system as I'm sure those are toast. If that doesn't get rid of the ticking, then hell I'll just have to live with it. That's what the sound system's for in a Chevy right? To Muffle the valvetrain noise and body squeaks and rattles?
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