What could be leaking? - LS1TECH

Go Back   LS1TECH > VEHICLE SPECIFIC FORUMS > Cadillac CTS-V
Log In 
Search


Cadillac CTS-V
The Caddy with an Attitude...


What could be leaking?

Reply
 
Thread Tools Search this Thread
Old 08-18-2012, 08:51 PM   #1
Teching In
 
Trader Rating: 1
Join Date: Aug 2011
Posts: 20
Default What could be leaking?

I recently put a ported throttle body on my car and when rolling down the highway if i push the clutch in and throw it in neutral the revs spike up. I recently put the stock throttle body back on and the issue remains. My tuner also said that the LTFTs have been allover the place and that the cars running lean
. Just curious where i should start looking for leaks? Thanks
howanicm is offline   Reply With Quote
Old 08-18-2012, 09:53 PM   #2
On The Tree
 
cammedv's Avatar
 
Trader Rating: 0
Join Date: Jan 2012
Posts: 118
Default

def going to be a vacum leak
use carb cleaner/brake clean, spray enigne down when running and listen for spike in rpm, that will help pin point the leak.
check the vacum lines, intake maniflod, anything post maf
cammedv is offline   Reply With Quote
Old 08-18-2012, 10:57 PM   #3
TECH Resident
 
Trader Rating: 2
Join Date: Apr 2010
Posts: 868
Default

Doesn't brake clean drop the rpm?
__________________
'06 CTS-V (Black on grey)~K&N FIPK II~muff & res delete~Magnaflow Tru-X~CS motor & trans mounts~PISNUOFF shifter~H&R sport springs (spaced up 3/8ths in the rear)~MM spacers~Z06 front endlinks~Hyper Black Linea Corse Venetos w/ 245/40-19 & 275/35-19~MAP trailing arms~eBay clear fogs~various LED conversions~Brake Motive D/S rotors~Gripforce LS7 clutch~
wes8398 is offline   Reply With Quote
Old 08-18-2012, 11:23 PM   #4
Staging Lane
 
jrane's Avatar
 
Trader Rating: 10
Join Date: Aug 2011
Location: TEXAS
Posts: 68
Default

Starting fluid works real well

But there arn't many places on the V's for a vacuum leak. The vacuum hose to the brake booster, the hose from the valley cover, the plastic hose at the neck of the intake that runs to the back of the car, or on the back of the intake manifold there is a small nipple that has a plastic cap that break off sometimes next to where the break booster hose plugs in (you can just cap it), or there is a crack in the manifold somewhere.

That's about the only places where you can get a vacuum leak on the ls2 V's idk how different it is on the ls6's
__________________
2009 Cts-V - TT
2008 Vette - GONE
2006 Cts-V - SOLD
2000 Silverado - SOLD
1979 Z28 - 5.3/Single Turbo - SOLD
jrane is offline   Reply With Quote
Old 08-19-2012, 12:22 AM   #5
Teching In
 
Trader Rating: 1
Join Date: Aug 2011
Posts: 20
Default

The starting fluid idea is a good one. I should have mentioned its an ls6 v. But im gonna get a can of ether to see. Another member on CF mentioned about 10 places to check so i guess ill just spray a bunch of ether on all those places. Thanks for all the input and ill keep you guys posted if i get it fixed or not..
Thanks again
howanicm is offline   Reply With Quote
Old 08-19-2012, 12:39 AM   #6
Staging Lane
 
Brian68's Avatar
 
Trader Rating: 0
Join Date: Sep 2011
Posts: 67
Default

The problem with starting fluid is it makes narrowing down a smaller leak near impossible since there is so much fuel evaporation going on all at once. There is also a much larger chance of a marginal plug wire, alternator or the like lighting off the starting fluid compared to brake or carburetor cleaner.

If you don't find a leak there might be issues with the throttle position sensor, MAP, and mass air flow correlations. I am not by any means a tuner, so ask them first. I am just starting to lurk in the PCM tuning forum and have sooooo much to learn.

Good luck.

Last edited by Brian68; 08-19-2012 at 12:50 AM. Reason: Added information
Brian68 is offline   Reply With Quote
Old 08-19-2012, 08:19 AM   #7
TECH Fanatic
 
RADEoN's Avatar
 
Trader Rating: 12
Join Date: Mar 2010
Location: Harrison City, PA
Posts: 1,561
Send a message via AIM to RADEoN Send a message via Skype™ to RADEoN
Default

howanic, you're allowed to give me a call.

I sold him the throttle body, and I had no issues like this, whatsoever. I think you either have a cracked/leaking vacuum line, or a bad TB gasket.
__________________


TMS408-PRC 2.5 HEADS-TSP GIANT CAM-WALBRO255-DEKA60-FAST102-547.66/502.3
RADEoN is offline   Reply With Quote
Old 08-19-2012, 06:09 PM   #8
Teching In
 
Trader Rating: 1
Join Date: Aug 2011
Posts: 20
Default

I just took it for a ride and it seems worse. I had my trinity plugged in and it looks like when i let off while rolling to a stop w/ the car in neutral the absolute throttle position goes up like 10-13% could this be my throttle position sensor going bad but not bad enough to throw a code? Also while i was driving it it went into reduced power mode and threw a code but i didnt catch it cuz i cleared it to get out of traffic. But i did see intake manifold something sensor bank 1 i believe
howanicm is offline   Reply With Quote
Reply


Tags
bad, car, common, drive, leak, leaks, ls2, vacuum


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off


 

All times are GMT -5. The time now is 09:35 AM.


Powered by vBulletin® Version 3.8.7 AC2
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Advertising - Terms of Service - Privacy Statement - Terms of Service - JOBS
Emails & Contact Details