Need Help Fast: LS6 Intake Install Problem (people knowledgable with HPTuners inside)
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From: Davenport, Iowa
Need Help Fast: LS6 Intake Install Problem (people knowledgable with HPTuners inside) OK, me and a few guys installed the LS6 intake manifold as well as removed EGR and AIR. Well after everything was put back on, we started her up and she idles like there's a huge cam (basically like a really bad vacuum leak or something). Thing is, BAM-BAM (member here) came over with his laptop and HPTuners, we deleted the EGR codes and such, and what the graphs showed was that my fuel injectors were showing no pulse whatsoever.
It also showed that the "long term" fuel things (I'm a technical newbie) were maxed out, and the "short term" ones were going up until maximum to compensate. We checked around and all hoses and electrical plugs, injectors, everything is plugged in as far as we could tell (hard to tell with the hoses in the back of the intake though). All fuses were fine too.
Has anyone ran into this problem? I'm so lost, as are just about everyone else who've tried to help resolve this problem. And the thing is, I'm in a hurry because in a week and a half, I leave for Ohio for Thunder in the North.
Anyone, any help would be incredibly appreciated, especially those who know HPTuners in-depth.
It also showed that the "long term" fuel things (I'm a technical newbie) were maxed out, and the "short term" ones were going up until maximum to compensate. We checked around and all hoses and electrical plugs, injectors, everything is plugged in as far as we could tell (hard to tell with the hoses in the back of the intake though). All fuses were fine too.
Has anyone ran into this problem? I'm so lost, as are just about everyone else who've tried to help resolve this problem. And the thing is, I'm in a hurry because in a week and a half, I leave for Ohio for Thunder in the North.
Anyone, any help would be incredibly appreciated, especially those who know HPTuners in-depth.
did you unplug the air pump under the drivers side fog light? I let mine plugged in, and it did that on the first start up. Also, have you started it back up again, sometimes it takes awhile for the car to relearn the fuel trims. Also I just removed my egr+air several weeks ago, and CONAN (member) told me that after about 100 miles of driving, two or three new codes will show up, I know 410 is one low effiecenty airpump history or something like that so you better keep bambam handy.
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Yeah, I uplugged the AIR hose from the "canister" behind the driver-side headlight before the very first start-up. We started it up multiple times, flashing the computer numerous times, etc. We definitely played it safe with everything we did though: nothing stupid was done. I haven't driven it though. I really don't wanna drive it with the way it even idles: just makes me too nervous. I'm just so lost.
Edit: Also FWIW, the intake is used (BAM-BAM's old setup). It had only 5K miles on it before. I didn't check the intake for o-rings, but I assume it had/has them anyways since all BAM-BAM did was take it off, sell it to me, etc. The o-rings weren't tampered with basically, so I imagine they're still on there. Hopefully that helps to narrow the possible problems down a bit.
Basically, what would cause the injectors to show ZERO pulse on the graphs? And would that cause the car to idle/run like it does?
Edit: Also FWIW, the intake is used (BAM-BAM's old setup). It had only 5K miles on it before. I didn't check the intake for o-rings, but I assume it had/has them anyways since all BAM-BAM did was take it off, sell it to me, etc. The o-rings weren't tampered with basically, so I imagine they're still on there. Hopefully that helps to narrow the possible problems down a bit.
Basically, what would cause the injectors to show ZERO pulse on the graphs? And would that cause the car to idle/run like it does?
Last edited by TransAm52804; Jun 8, 2005 at 08:21 PM.
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From: Davenport, Iowa
Originally Posted by 2xLS1
Did you replace the coolant tube with the LS6 one and plugs in the rear? Did you remove the 2 plastic clips taped to the knock sensor wiring harness?
What would removing those clips do, BTW?
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I think what we're gonna do, probably have to do, is just take it all back off, go over ever single detail twice, and make sure, one by one, that every single thing goes correctly when re-installing.
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Verdad Gallardo I just ran into this problem, although my injectors were still pulsing, but take a can of ether, or propane torch(not lit) with the car runnning, spray where the base of intake and heads meet, if the idle rises and levels out you have a leak. Go slow, as if it does this on one side over like (example) number 2 intake port that is where your leak is. I also posted a thread asking this in internal engine call lsx????? check it out, there might be some information useful to you
actually, there are gaskets. They're grey oring gaskets that go in each port. make sure you have all of them in. Also, make sure you torqued the bolts down in the right sequence also. My LTFT's were pegged at 25+ when I had a vaccum leak. That was the reason. Reseat the intake and make sure the fuel injector sensors are all plugged in correctly and that the injectors are seated in the manifold also.
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Well everyone, after a week of guess-work and suggestions, me and a few buds took the manifold off tonight because we were basically gonna start over from scratch and check every detail.
A few of you were right: there was not a SINGLE manifold gasket out of all eight!!!!! How it slipped past of the first time, I dunno. I didn't know too much about all of it so it didn't cross my mind. But tonight, when turning the manifold over to check for the gaskets, I was first pissed off but then SOOOOOOOOO relieved to see not a single gasket, because that meant I found the problem and know it will easily be solved!
I'm gonna get the new gaskets tomorrow and we're gonna re-install the LS6 on Sunday night. God I'm so freakin' happy right now. I've been in the "f*ck everything" state of mind the past week because I was so lost with this.
Now I can get her ready for Thunder in the North next weekend.
Also FWIW, you can see my current best with just lid and catback: 13.1@108.4... Would the LS6 enable me to hit 110 on a good night? Of course I'd love to see 12.9's too, but would it give me about another 2 m.p.h.?
A few of you were right: there was not a SINGLE manifold gasket out of all eight!!!!! How it slipped past of the first time, I dunno. I didn't know too much about all of it so it didn't cross my mind. But tonight, when turning the manifold over to check for the gaskets, I was first pissed off but then SOOOOOOOOO relieved to see not a single gasket, because that meant I found the problem and know it will easily be solved!
I'm gonna get the new gaskets tomorrow and we're gonna re-install the LS6 on Sunday night. God I'm so freakin' happy right now. I've been in the "f*ck everything" state of mind the past week because I was so lost with this.
Now I can get her ready for Thunder in the North next weekend.
Also FWIW, you can see my current best with just lid and catback: 13.1@108.4... Would the LS6 enable me to hit 110 on a good night? Of course I'd love to see 12.9's too, but would it give me about another 2 m.p.h.?
glad I could help solve the problem. I did the same damn thing. The funny thing is that I got it tuned like that and put 377/371 
I actually just retuned my idle and part throttle today and finally set my pinion angle correctly on my car!!! Im loving her again
I actually just retuned my idle and part throttle today and finally set my pinion angle correctly on my car!!! Im loving her again 
Missing intake gaskets, how could you guys miss this? Glad you figured it out without breaking anything or killing anyone. 
Intake gaskets aren't cheap. I got mine from Thunder for around $65 for the set. 
I haven't checked dealer prices.
Intake gaskets aren't cheap. I got mine from Thunder for around $65 for the set. I haven't checked dealer prices.
Originally Posted by JustAnIlluzion
how much u guys paying for new gaskets?
