classic 3rd to 2nd tonight
Thread Starter
Staging Lane
Joined: Jul 2006
Posts: 65
Likes: 0
classic 3rd to 2nd tonight ran some cars tonight and you guessed it, went straight from 3rd gear to 2nd gear. Scan tool is registering tons of misfires on cyl 5 and 6. Multiple misfire code popped up. Drove car home staying under 2k rpms. M
My question is What all do I need to check to get her running like a champ again.
Pushrods?
roller rockers?
head damage?
What exactly should I look at?
My question is What all do I need to check to get her running like a champ again.
Pushrods?
roller rockers?
head damage?
What exactly should I look at?
Pretty much all of those things. Pull your heads, roll pushrods on a flat surface, check heads for damage (valves too), check valve guides, also check for piston head damage. You may want to pull your heads apart to check if the intake and exhaust valves are still straight and true. Of course that requires the tedious work of pulling all the valvesprings off 
Check your cylinder sleeves for any scorching or gouges. They should feel smoothe to the touch around the whole sleeve. You will have to crank the motor by hand of course to check the all the cylinder sleeves. And like you said check your rockers and also your valvesprings for damage. Look for any metallic pieces laying around in the heads if you find some then you have to investigate to where it came from. If I missed anything I'll edit later but for the most part it looks like you got some splainin' to do ;-) . I've mis-shifted from 5th to 2nd so don't feel too bad. Good luck!
Check your cylinder sleeves for any scorching or gouges. They should feel smoothe to the touch around the whole sleeve. You will have to crank the motor by hand of course to check the all the cylinder sleeves. And like you said check your rockers and also your valvesprings for damage. Look for any metallic pieces laying around in the heads if you find some then you have to investigate to where it came from. If I missed anything I'll edit later but for the most part it looks like you got some splainin' to do ;-) . I've mis-shifted from 5th to 2nd so don't feel too bad. Good luck!
Intake and exhaust valves are IN the heads yes. They sit directly beneath the valvesprings. The valvesprings are held on the intake and exhaust valves with retainers and locks. You need a valvespring compressor tool to get the valvesprings off. It's a real PITA and if you get the tool from CSK or Napa make sure it's not the one that requires you to squeeze the handle to compress the spring. Or you will not be able to feel your hands tomorrow. If you're not sure on how to get the heads off there's a good writeup here: http://www.ls1howto.com/index.php?article=3
TECH Resident
Joined: Jul 2005
Posts: 907
Likes: 1
From: NJ
also, start getting into the habit of holding the gear **** with the palm of your hand facing the passenger side when going from 3rd to 4th. youll have less of a chance of pulling the shifter toward 2nd.
That and buy an aftermarket shifter like the pro 5.0 or similar. I dont think I've ever missed that shift w/ the new shifter on.
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
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!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
if its only reading a bunch of miss fire clear the code, if it comes back on then you might have messed up the plugs but do you heer any noises and is the smoke coming out the back but you engine shold have governed and just in a way locked up the rear tires
Thread Starter
Staging Lane
Joined: Jul 2006
Posts: 65
Likes: 0
Cylinders 5 and 6 measured tons of misfires so i took out the pushrods in those two and they looked perfect. took a look down the valley of the motor and the valves appeared fine. rockers looked fine even when manually turning the motor. Some one suggested the coil packs on 5 and 6 could have burnt out. Any suggestions.
