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Old 06-23-2013, 03:36 AM   #1
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how to check for leaks after header installation

Ok so I know its the v8 section but I ask in the v6 and all I got was.. if u have a leak, u will get soot around that part.. well that's not good enough for me.. there has to be a better way to find out if there is a leak.. any suggestions?? This is why I ask.. I installed them and was told it would be a big power booster.. well I dont feel it.. the car feels actually less responsive.. the rpms seem to go quicker and the car feels stronger but if feels like it takes a minute to kick in.. reading some of the reviews in here.. some ppl have had the same experience.. so.. I have a tune but have not data log yet.. maybe AFR is all crazy?? Also I disconnected the ecu for about two days during the installation.. maybe its relearning the mods?? Should I re tune??

Any help from car enthusiastic r welcome..
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Old 06-23-2013, 04:02 AM   #2
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Well, my first question would be do you have the famous rotten egg smell? Your cats are supposed to clean this out so you don't smell it. So if you have cats with your LT and you can still smell the rotten egg smell then I would be guessing that you would have a leak.

As far as AFR, from my understanding LT won't affect your AFR, but a cai would. I'm not a 100% on this, but thats what I've read on the forum. Good luck.
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Old 06-23-2013, 04:09 AM   #3
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No smells at all.. I will retighten everything tom and see what's happening..
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Old 06-23-2013, 04:30 AM   #4
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Can you hear anything around the headers? The soot method is pretty damn reliable. If it's leaking, you should be able to hear it and see black soot around that area. Your AFR's shouldn't be affected by a exhaust leak.
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Old 06-23-2013, 05:38 AM   #5
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Actually, any leak in the exhaust before or within a foot or so behind the front O2 sensors will skew closed loop fueling drastically. The air infiltration confuses the sensors into thinking the mix is too lean and the ECU will fatten it up. Bad enough & it'll pop a CEL.

Closed loop positive fuel trims roll into WOT as well.
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Old 06-23-2013, 05:49 AM   #6
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Will the soot build right away? Only had the headers for 60 miles.. will a leak affect performance?
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Old 06-23-2013, 07:20 AM   #7
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I you have a leak you should also be able to hear it. It would sound like a ticking noise.
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Old 06-23-2013, 08:39 AM   #8
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Quote:
Originally Posted by Wuiquen View Post
Ok so I know its the v8 section but I ask in the v6 and all I got was.. if u have a leak, u will get soot around that part.. well that's not good enough for me.. there has to be a better way to find out if there is a leak.. any suggestions?? This is why I ask.. I installed them and was told it would be a big power booster.. well I dont feel it.. the car feels actually less responsive.. the rpms seem to go quicker and the car feels stronger but if feels like it takes a minute to kick in.. reading some of the reviews in here.. some ppl have had the same experience.. so.. I have a tune but have not data log yet.. maybe AFR is all crazy?? Also I disconnected the ecu for about two days during the installation.. maybe its relearning the mods?? Should I re tune??

Any help from car enthusiastic r welcome..
The simplest method I can think of is to have a Strong friend help you.

Set him up with Either Welding gloves or Heavy Pot holders, the wife might not be too happy with you after LOL

With the Car Idling, have him Cap the Exhaust tips as best he can an you look and listen for exhaust leaks, you will hear a Hissing sound wherever there are leaks.

You may have to repeat this several times as it gets pretty hot pretty fast and Arms Get tired holding back the pressure.

This is Very effective method.

Ted.
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Old 06-23-2013, 09:21 AM   #9
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Teds the man. This is the way I check for leaks and works great. The v6 has a small ticking sound and can play tricks on you.
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Old 06-23-2013, 10:24 AM   #10
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Ok.. I can try this.. right now my I dont have tips so the pipes r at the hangers where the old mufflers started..

Glad u say about the v6 having ticking noises.. I was able to post that.. just came back from a drive.. and listen to the engine.. I hear ticking but I think its the engine.. search with a flashlight for soot at least on the top part of the flange.. found nothing.. gotta look under and see what's up..
Now the big question is would a leak make u lose performance?? After my drive this morning I think maybe I was just expecting a lot more power. The car does feel stronger and faster.. maybe I thought It would be more but maybe I got it right.. idk.. I'm almost all modded up minus ported IM.. so maybe my gains won't be as much as other than do headers first than any other mod..

Thoughts???
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Old 06-23-2013, 10:25 AM   #11
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BTW u guys are awesome.. posted on the v6 section and got one person's attention.. I think they hate me over there.. they always ignore my threads.. oh well.. figure u guys over here might have some other ideas.. never hurt to reach out.
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Old 06-23-2013, 12:02 PM   #12
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We are even nicer if you own a v8. I think it can or may affect performance if on the head...the rest is just annoying.

congrats on your headers!
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Old 06-23-2013, 09:00 PM   #13
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By heads u mean flanges of the headers??

Thanks..
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Old 06-23-2013, 09:15 PM   #14
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Quote:
Originally Posted by Iam Broke View Post
Actually, any leak in the exhaust before or within a foot or so behind the front O2 sensors will skew closed loop fueling drastically. The air infiltration confuses the sensors into thinking the mix is too lean and the ECU will fatten it up. Bad enough & it'll pop a CEL.

Closed loop positive fuel trims roll into WOT as well.
In a closed system, the exhaust will help scavenge exhaust but once you have a leak at the header/heads section, it will blow out. This is the reason the soot forms on the outside. If there were a suction, the soot wouldn't be on the outside.
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Old 06-24-2013, 02:54 PM   #15
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gotcha.. well Ill keep my eyes open for soot but so far we are good..
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Old 06-24-2013, 03:14 PM   #16
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Quote:
Originally Posted by axis View Post
In a closed system, the exhaust will help scavenge exhaust but once you have a leak at the header/heads section, it will blow out. This is the reason the soot forms on the outside. If there were a suction, the soot wouldn't be on the outside.
It travels in pulses. Sometimes there is a pressure wave that will exhale through a leak. Sometimes there is a slight vacuum that will scavenge from wherever it can. If it is capable of pulling intake charge, then it is capable of pulling air through a bad enough leak. In closed loop operation, that could feasibly cause the front O2s to read lean.
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Old 06-24-2013, 06:22 PM   #17
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A leak is not gonna kill your power. You likely need a tune or something. Also, your butt is not a dyno...you need something more scientific.

Quote:
Originally Posted by Wuiquen View Post
Ok so I know its the v8 section but I ask in the v6 and all I got was.. if u have a leak, u will get soot around that part.. well that's not good enough for me.. there has to be a better way to find out if there is a leak.. any suggestions?? This is why I ask.. I installed them and was told it would be a big power booster.. well I dont feel it.. the car feels actually less responsive.. the rpms seem to go quicker and the car feels stronger but if feels like it takes a minute to kick in.. reading some of the reviews in here.. some ppl have had the same experience.. so.. I have a tune but have not data log yet.. maybe AFR is all crazy?? Also I disconnected the ecu for about two days during the installation.. maybe its relearning the mods?? Should I re tune??

Any help from car enthusiastic r welcome..
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