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please read: problem after cam install..never heard of this

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Old Oct 26, 2007 | 02:48 PM
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Default please read: problem after cam install..never heard of this

ok, so sunday i was able to get it to start and idle fine after some work, it was its first time..so after awhile it sounds like this http://www.youtube.com/watch?v=tskKVcOuApQ

ok sounds good...now, i go away to school for the week, come home today..go to start it up...and it labors at like 500 rpms, then shoots itself up to 4000 rpms...then comes down and kills itself off below 500 rpms...it did this twice. also, i let it go the second time to the 4000 and anticipated when it came down i would try to pedal it to keep it alive at around 1000 to idle and got no throttle response...

please help!!
the computer was tuned by HP tuners, he knew all of my mods and what not...why in the world would it idle fine like in the clip (that took a while to get it to do that) and now a week later it does this!?
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Old Oct 26, 2007 | 02:50 PM
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sounds like a vacuum leak
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Old Oct 26, 2007 | 02:52 PM
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where in particular any ideas
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Old Oct 26, 2007 | 02:54 PM
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Did you take the intake manifold off?
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Old Oct 26, 2007 | 02:56 PM
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well its stock mani was the ls1 and putting an ls6 manifold was one of my mods that i just did...along with everything in the sig.
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Old Oct 26, 2007 | 03:01 PM
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did you use new gaskets?
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Old Oct 26, 2007 | 03:03 PM
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sounds like a vacuum leak to me, check all hoses, ect...
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Old Oct 26, 2007 | 03:05 PM
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I'd loosen the intake. Dont take it out, but just lift it up to unseat it from the heads.

Then seat it again and tighten the bolts down in the correct sequence and torque them properly. See if that fixes your problem.
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Old Oct 26, 2007 | 03:09 PM
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theres only a few hoses that would constitute checking right? i mean, hose wise im not sure what it would be....i am beginning to question the intake manifold myself...do you think it would be a gasket issue? i used the gasket that came with the mani new
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Old Oct 26, 2007 | 03:10 PM
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it was running sweet last sun, now it decides it needs to rev to like 4000 rpms then kill itself off lol
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Old Oct 26, 2007 | 03:10 PM
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it has to be something silly......check and re-check everything...i know you hate hearing that but it must be done....did you get the 02 extensions?...when i fired mine up the first time i was so excited i left the damn 02's out...once i plugged them it took a solid 15min before the car would idle on it;s own.....thats even with the 90/90 that comes with the adjustable throttle screw
dont feel too bad this happens to everyone in one form or another
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Old Oct 26, 2007 | 03:13 PM
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yeh did the o2 extensions those are in alright...its safe to say its likely not a bad tune though? i question it needs tuned slightly diff or its something with the intake
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Old Oct 26, 2007 | 03:18 PM
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you never know about tuning......as far as bikes go.....even the land elevation is taken into consideration.......trailered my bike to jackson hole, wy and ran like **** in the middle of the summer......got back home ran like a raped ape!!!
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Old Oct 26, 2007 | 03:19 PM
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make sure your maf is plugged in
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Old Oct 26, 2007 | 03:20 PM
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yeah that is what is so odd is how it can run just fine one day..turn it off come back a week later and then have that...can the brake vacuum line from the back of the intake effect nething if it had a leak
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Old Oct 26, 2007 | 03:20 PM
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ok, ill check the maff, cant imagine being that stupid but u never know when it comes to me lol
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Old Oct 26, 2007 | 03:23 PM
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yea it can......have u ever unplugged that line.....it;s like the lifeline in a sence for the entire car
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Old Oct 26, 2007 | 03:26 PM
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obviously when i put the new manifold on i had to put new hose on my new manifold then run it over to the brake booster.
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Old Oct 26, 2007 | 03:29 PM
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Originally Posted by bowe1632
obviously when i put the new manifold on i had to put new hose on my new manifold then run it over to the brake booster.
he meant while it was running
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Old Oct 26, 2007 | 03:31 PM
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negative, never done that...ill check to make sure its connected properly though.
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