valvetrain noise under load
Thread Starter
Teching In
Joined: Mar 2009
Posts: 19
Likes: 0
From: Belton, TX
valvetrain noise under load Alright guys and gals, looking for a little help here, I'm gettin bad valvetrain noise. Driving around town at 30mph, sounds like it should, nice and quiet(valvetrain that is 
). I get this valvetrain noise when the car is under high load low acceleration configurations. For example, when i go up a big hill it will make the noise. It also makes the noise under hard acceleration. I have adjusted the valves twice to double check my work, and it still makes the noise. Pre-load is at 3/4 turn past zero lash (used to be 1/2 turn but figured I would tighten it a 1/4 turn more just in case that was too loose but it still makes the noise). Rather than just start taking stuff apart, I would like a second opinion. Thanks Folks.
). I get this valvetrain noise when the car is under high load low acceleration configurations. For example, when i go up a big hill it will make the noise. It also makes the noise under hard acceleration. I have adjusted the valves twice to double check my work, and it still makes the noise. Pre-load is at 3/4 turn past zero lash (used to be 1/2 turn but figured I would tighten it a 1/4 turn more just in case that was too loose but it still makes the noise). Rather than just start taking stuff apart, I would like a second opinion. Thanks Folks. That most likely is not valvetrain noise or the valves rattling( where the hell that phrase came from I have no idea)
Sounds like detonation to me, and its bad. Need to find out why.
Sounds like detonation to me, and its bad. Need to find out why.
Sounds more like an exhaust leak to me. Check around all your exhaust ports, around the spark plug boots, header bolts and flanges to see if there's any carbon buildup.
At first start up put your hand around all these areas to see if you can feel anything as well. Exhaust leaks can sounds exactly like excessive valvetrain noise. Check for loose spark plugs as well.
At first start up put your hand around all these areas to see if you can feel anything as well. Exhaust leaks can sounds exactly like excessive valvetrain noise. Check for loose spark plugs as well.
Thread Starter
Teching In
Joined: Mar 2009
Posts: 19
Likes: 0
From: Belton, TX
Well among further investigation, it appears to be a "lean misfire". It just recently started doing this, but stumbles a little bit as well at higher loads as well as the detonation, or "valvetrain" type noise that I had described earlier. Thanks for the heads up, Im going to take a look at fuel pressure tomorrow as well as filter to see if I'm lacking pressure then look for any possible air leaks that would cause it to run too lean. I'll keep you guys updated.
Throwing a code? what is it?
I installed Roller Rockers and noticed a bit of a difference but I installed valve springs and it got even louder..
I also hear my headers A LOT.. not leaking, just "exhuast".... If that makes sense..?
I installed Roller Rockers and noticed a bit of a difference but I installed valve springs and it got even louder..
I also hear my headers A LOT.. not leaking, just "exhuast".... If that makes sense..?
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