Valve spring change, now idles different
Thread Starter
TECH Regular
Joined: Dec 2011
Posts: 461
Likes: 0
From: Hastings, Nebraska
Valve spring change, now idles different As stated I changed the springs and now I have a slightly rougher idle (sounds like its a bigger cam) and in 4th gear anything under about 1700rpm ~40 mph it lugs the engine pretty hard which I didn't have problems with before. Wonder if the rockers are set to tight?
Yep, they're probably too tight.
Finding zero lash is where most people err. You might be surprised at how much you can move the rocker around at zero lash. If it's tight and it takes any effort at all to spin the pushrod, you've gone too far.
Finding zero lash is where most people err. You might be surprised at how much you can move the rocker around at zero lash. If it's tight and it takes any effort at all to spin the pushrod, you've gone too far.
Several different procedures to adjust valves here:
http://shbox.com/1/4th_gen_tech2.html#adjust_valves
I would suggest not using the engine running method since it's quite possible the valves are out of whack.
http://shbox.com/1/4th_gen_tech2.html#adjust_valves
I would suggest not using the engine running method since it's quite possible the valves are out of whack.
Trending Topics
I have always adjusted them with the engine off and just rotating the motor over by hand until they are all adjusted. I tighten until I feel a very slight drag on the pushrod, then I go 3/8-1/2 turn with roller rockers and 1/2-5/8 turn with standard stamped rockers.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?
Pouria Savadkouei
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
