LS2 Runs On
Thread Starter
Teching In
Joined: Jan 2012
Posts: 34
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From: Previously Michigan (90's) Florida (2000's) and Currently Somerset, England.
LS2 Runs On I recently got my LS2 Crate fired up for the first time. I have plumbed the steam line into the top hose because I am running a Speed Demon carb on an Edelbrock intake and an MSD ignition box. If I run the engine for a while, then shut the car off, it tries to run on for a bit. Very diesel sounding. Just for a couple of seconds, but enough to sound worrying. I am concerned that the top of the engine isn't cooling properly. Any suggestions or previous similar experience would help.
Whats the idle at? If i let mine (carb ls2 also) idle at 1k it will run on for a second. If i knock it down to even 900 it wont. With the cam i have it wants to be up there though so i usually throw the fan or blower motor on right before i kill it and it shuts right off
Yea dads with a carb on it did that last year tried a bunch of stuff best thing I found was to kick the AC on when pulling in somewhere and then shut it off.
With EFI it dosn't do it.
Tim
With EFI it dosn't do it.
Tim
Thread Starter
Teching In
Joined: Jan 2012
Posts: 34
Likes: 0
From: Previously Michigan (90's) Florida (2000's) and Currently Somerset, England.
I have run the engine a couple more times. I have the idle screw on the Speed Demon backed right out and I cannot get below 1100 rpm. I find that if I blip the throttle and shut the ignition off before the engine gets back to idle, it doesn't do it.
There is no A/C on this car. It is not worth it for the 2 weeks of summer we get in this country, and we already had them in March.
When I finally get it on the road, I will experiment with fuel quality.
There is no A/C on this car. It is not worth it for the 2 weeks of summer we get in this country, and we already had them in March.
When I finally get it on the road, I will experiment with fuel quality.
I have run the engine a couple more times. I have the idle screw on the Speed Demon backed right out and I cannot get below 1100 rpm. I find that if I blip the throttle and shut the ignition off before the engine gets back to idle, it doesn't do it.
There is no A/C on this car. It is not worth it for the 2 weeks of summer we get in this country, and we already had them in March.
When I finally get it on the road, I will experiment with fuel quality.
There is no A/C on this car. It is not worth it for the 2 weeks of summer we get in this country, and we already had them in March.
When I finally get it on the road, I will experiment with fuel quality.
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Do you have a PCV valve somewhere? I see you have a fresh air hose going to nowhere on the driver's valvecover and I'm guessing you're pulling PCV from the valley cover back to the carb. If you don't have a PCV valve between the carb and the valley cover (or built into the valley cover), it will act like a vacuum leak. Try pinching off the PCV line going to the carb and see if your idle comes down.
Last edited by -TheBandit-; May 7, 2012 at 01:23 PM.
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Teching In
Joined: Jan 2012
Posts: 34
Likes: 0
From: Previously Michigan (90's) Florida (2000's) and Currently Somerset, England.
Thanks for the suggestions. I will try this stuff out and report back. I read somewhere that there is a pcv valve under the valve cover on these engines???
Did a little searching and it looks like it may be integrated into the valley cover.
https://ls1tech.com/forums/generatio...cv-system.html
High idle speed indicates a potential vacuum leak to me, which is why I suggested looking a the PCV system, but you should check all the vacuum connections on the carb & intake.
Sorry I didn't mention it before, but it looks like a very well done swap. Very clean install. do you have any shots of the whole car?
https://ls1tech.com/forums/generatio...cv-system.html
High idle speed indicates a potential vacuum leak to me, which is why I suggested looking a the PCV system, but you should check all the vacuum connections on the carb & intake.
Sorry I didn't mention it before, but it looks like a very well done swap. Very clean install. do you have any shots of the whole car?
