Died in neutral?

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Mar 19, 2017 | 10:32 PM

All Stock Ls2

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Instructor

Joined: Mar 2017

Posts: 239

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From: Columbus, GA

Died in neutral?

Hello everyone I'm new to the Corvette world but not quite to the ls world having helped build my brothers 700hp ls2 gto. Anyway, I picked up a heavily moded c6 3 days ago and it had given me ZERO issues. After a 2 hour drive on the third day of owning it I turned it off and left for about 30 minutes for a haircut. When I hopped back in and took off again there was hesitation when hitting the throttle there was about a half a second delay and it would hiccup while driving. When I finally got back on base I threw it in neutral at around 25mph and the rpms dropped to nothing and it would catch itself and pick them back up to 1k but it kept doing that and after throwing it in neutral a third time to test it it actually died on me. When I went to turn it back on it started no problem and idled just fine. When I have it gas and the rpms dropped they dropped to 400 then picked back up to 1k. I parked the car and after 40 minutes (car temp still hot) I turned it on and no problems at all I mean zero. Any ideas where I should look first? The car is doing just fine now but it'd be nice to know where to begin looking. Thanks in advance!

Last edited by All Stock Ls2; Mar 19, 2017 at 10:38 PM.

Mar 19, 2017 | 10:34 PM

All Stock Ls2

Thread Starter

Instructor

Joined: Mar 2017

Posts: 239

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From: Columbus, GA

The mods are as follows (and tuned by vengeance) making 502whp and 447wtq
- Vengeance Racing Kaotik cam
- Trickflow 225 heads
- Comp Cam push rods
- Yella Terra Roller rocker arms
- BTR .660" dual spring titanium valves
- Callaway Honker cold air intake
- FAST LSXR 102 intake manifold
- FAST fuel rails
- Stage 2 clutch
- Eibach Anti-Roll Kit
- NITTO NT05R Drag Radials

Mar 19, 2017 | 10:37 PM

Dcasole

Le Mans Master

Joined: Oct 2014

Posts: 8,673

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From: Atlanta GA

Vacuum Leak ??

Dave

Mar 19, 2017 | 10:40 PM

All Stock Ls2

Thread Starter

Instructor

Joined: Mar 2017

Posts: 239

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From: Columbus, GA

Quote:

Originally Posted by Dcasole

Vacuum Leak ??

Dave

Could possibly be but I hadn't seen it before and after turning it off I haven't had any issues. I should also mention there's an exhaust leak midway to the back

Mar 19, 2017 | 10:43 PM

All Stock Ls2

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Instructor

Joined: Mar 2017

Posts: 239

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From: Columbus, GA

Quote:

Originally Posted by Dcasole

Vacuum Leak ??

Dave

Also, where should I begin to look for a leak test? I read something about carb cleaner but I'm still lost where would I spray it and so on

Last edited by All Stock Ls2; Mar 19, 2017 at 10:44 PM.

Mar 19, 2017 | 11:45 PM

HK770

Burning Brakes

Joined: Aug 2014

Posts: 1,240

Likes: 258

From: Tampa FL

Spraying carb cleaner

A Vacuum leak is sucking extra air into engine. Its the propellant usually propane sprayed around the intake and hoses that does the trick.

If extra fuel is drawn into the engine, you will hear an increase in engine RPM. Vacuum leak found!!
Luck

Mar 20, 2017 | 12:44 AM

All Stock Ls2

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From: Columbus, GA

Quote:

Originally Posted by HK770

So spray around the hoses and intake and if I hear the sudden rpm change that's where my leak is seems pretty straight forward does starting fluid work? And if it isn't a vacuum leak (fingers crossed it is) what would be next in line for me to check? I appreciate taking your time to reply btw

Mar 20, 2017 | 05:13 AM

HK770

Burning Brakes

Joined: Aug 2014

Posts: 1,240

Likes: 258

From: Tampa FL

A one time thing would be hard for a master tech to understand. I am not that person, sorry unable to guess!

luck to you and yours ....HK

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Mar 20, 2017 | 11:20 AM

0Daniel@Vengeance

Former Vendor

Joined: Dec 2011

Posts: 2,559

Likes: 162

From: Cumming Georgia

As others have said here it sounds like a vacuum leak for sure. This should hopefully be a quick and easy fix for your issues!

Mar 20, 2017 | 09:48 PM

#10

All Stock Ls2

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Instructor

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From: Columbus, GA

Quote:

Originally Posted by David@Vengeance

As others have said here it sounds like a vacuum leak for sure. This should hopefully be a quick and easy fix for your issues!

Hi David thanks for taking the time to reply! My car was actually tuned by you guys a while back which was a huge relief knowing you guys did the work! When I have time on the weekend I'll check to see! By the way incredible work on you guys' part the idle is so smooth for such an aggressive cam you guys rock! Also, what dyno do you guys use is it a lower reading dyno? Just curious. The car made 502whp and 447wtq

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