Vvt delete is a new timing cover necessary?
Vvt delete is a new timing cover necessary? I’m doing a dod and VVT delete on an LC9 to go in an older truck that will be using an aftermarket computer that only needs a crank signal
Do I need a new cover in this instance or can I simply use the correct cam sprocket on my cam and rock on?
same goes for my chain guide.
Do I need a new cover in this instance or can I simply use the correct cam sprocket on my cam and rock on?
same goes for my chain guide.
TECH Senior Member
Joined: Jun 2016
Posts: 22,298
Likes: 3,619
From: Central Cal.
I’m doing a dod and VVT delete on an LC9 to go in an older truck that will be using an aftermarket computer that only needs a crank signal
Do I need a new cover in this instance or can I simply use the correct cam sprocket on my cam and rock on?
same goes for my chain guide.
Do I need a new cover in this instance or can I simply use the correct cam sprocket on my cam and rock on?
same goes for my chain guide.
im not using any sensors associated with the camshaft sprocket. So it sounds like I should be good
speeduino ua4c. So it’ll be batch fire, semi wasted spark
Last edited by krochus; Dec 2, 2019 at 08:33 AM.
TECH Senior Member
Joined: Jun 2016
Posts: 22,298
Likes: 3,619
From: Central Cal.
Trending Topics
You can use whatever front cover and cam gear you want if you aren't going to be running a cam sensor. (as long as the cam gear is the right one to bolt to the cam obviously)
And chain guide... which are you talking about, I assume you mean the chain damper. If that's what you mean they're all the same that I'm aware of.
And chain guide... which are you talking about, I assume you mean the chain damper. If that's what you mean they're all the same that I'm aware of.
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
Launching!
Joined: Jan 2004
Posts: 199
Likes: 20
Funny, i was wondering the same thing.
Talked with Texas Speed, "non VVT cover is required due to spacing of the cam sensor. A VVT cover with actuator removed will put the cam sensor too far away to read correctly. VVT cam sensor will bolt into the non VVT cover, 2 extra wires for actuator will be - extra"
I havent bolted this up yet, just ordered parts yesterday. Correct me if needed.
Talked with Texas Speed, "non VVT cover is required due to spacing of the cam sensor. A VVT cover with actuator removed will put the cam sensor too far away to read correctly. VVT cam sensor will bolt into the non VVT cover, 2 extra wires for actuator will be - extra"
I havent bolted this up yet, just ordered parts yesterday. Correct me if needed.
Funny, i was wondering the same thing.
Talked with Texas Speed, "non VVT cover is required due to spacing of the cam sensor. A VVT cover with actuator removed will put the cam sensor too far away to read correctly. VVT cam sensor will bolt into the non VVT cover, 2 extra wires for actuator will be - extra"
I havent bolted this up yet, just ordered parts yesterday. Correct me if needed.
Talked with Texas Speed, "non VVT cover is required due to spacing of the cam sensor. A VVT cover with actuator removed will put the cam sensor too far away to read correctly. VVT cam sensor will bolt into the non VVT cover, 2 extra wires for actuator will be - extra"
I havent bolted this up yet, just ordered parts yesterday. Correct me if needed.
if you need a cam sensor you need a VVT delete cover.
Teching In
Joined: Aug 2025
Posts: 13
Likes: 0
From: Lafayette ga
Teching In
Joined: Aug 2025
Posts: 13
Likes: 0
From: Lafayette ga
TECH Addict
Joined: Dec 2017
Posts: 2,190
Likes: 976
You say "long crank":
Does it start up right EXACTLY half the time; and the other EXACTLY half the time, it will crank forever and not start the first time you turn the key, but cranks right up IMMEDIATELY the 2nd time you hit the key?
Does it start up right EXACTLY half the time; and the other EXACTLY half the time, it will crank forever and not start the first time you turn the key, but cranks right up IMMEDIATELY the 2nd time you hit the key?
Teching In
Joined: Aug 2025
Posts: 13
Likes: 0
From: Lafayette ga
It's starts Everytime but the first time u crank it it takes longer to start an it might backfire alit before it starts an after that it starts faster but still not as fast as it did before it spins alot longer now
TECH Addict
Joined: Dec 2017
Posts: 2,190
Likes: 976
OK, so it's doing EXACTLY what I said then, right:
First time you go to start it up, EXACTLY half the times you try, it cranks forever and a half, and only spits back into the exhaust, if anything; but then you turn the key again, and it starts RIGHT UP? And EXACTLY the other half of the time when you go to start it, it starts like normal?
First time you go to start it up, EXACTLY half the times you try, it cranks forever and a half, and only spits back into the exhaust, if anything; but then you turn the key again, and it starts RIGHT UP? And EXACTLY the other half of the time when you go to start it, it starts like normal?
Teching In
Joined: Aug 2025
Posts: 13
Likes: 0
From: Lafayette ga
OK, so it's doing EXACTLY what I said then, right:
First time you go to start it up, EXACTLY half the times you try, it cranks forever and a half, and only spits back into the exhaust, if anything; but then you turn the key again, and it starts RIGHT UP? And EXACTLY the other half of the time when you go to start it, it starts like normal?
First time you go to start it up, EXACTLY half the times you try, it cranks forever and a half, and only spits back into the exhaust, if anything; but then you turn the key again, and it starts RIGHT UP? And EXACTLY the other half of the time when you go to start it, it starts like normal?
TECH Addict
Joined: Dec 2017
Posts: 2,190
Likes: 976
Since you said you changed out the cam sensor, it needs a crank relearn.
It behaves like this because it knows from the crank sensor which cyls are at TDC, butt DOESN'T know which half-rotation the cam is on; so EXACTLY HALF the time, it tries to fire off #6 when #1 should be firing, etc.; each of those pairs of cyls that come to TDC at the same time, butt only one is firing, while the other is just closing the exh valve and opening the int. EXACTLY THE OTHER HALF of the time it guesses right the first time. Although I don't know the EXACT logic the ECM uses, apparently it's smart enough that if it knows that it isn't sure about the cam signal, and it doesn't start the first time you hit the key, it guesses that it guessed wrong, and changes its guess to the other cyl of the pairs at TDC at the same time; and lights right off.
Kinda the equivalent of dropping in the dist 180° out in the old SBC, except EXACTLY half the time.
When you get your tune, let em know that it needs a crank relearn first.
It behaves like this because it knows from the crank sensor which cyls are at TDC, butt DOESN'T know which half-rotation the cam is on; so EXACTLY HALF the time, it tries to fire off #6 when #1 should be firing, etc.; each of those pairs of cyls that come to TDC at the same time, butt only one is firing, while the other is just closing the exh valve and opening the int. EXACTLY THE OTHER HALF of the time it guesses right the first time. Although I don't know the EXACT logic the ECM uses, apparently it's smart enough that if it knows that it isn't sure about the cam signal, and it doesn't start the first time you hit the key, it guesses that it guessed wrong, and changes its guess to the other cyl of the pairs at TDC at the same time; and lights right off.
Kinda the equivalent of dropping in the dist 180° out in the old SBC, except EXACTLY half the time.
When you get your tune, let em know that it needs a crank relearn first.
