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5.3 Vortec runs like its Camming or at 4000 rpm with no throttle...

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Old 11-24-2012, 08:02 PM
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Do you have any software that can monitor your timing and MAP KPA?
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Old 11-24-2012, 08:08 PM
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Originally Posted by 1FastBrick
What color is the intake gasket??? Are they original???

Did you plug the vacuum line from the back of the intake manifold to the brake booster in correctly???
They are the orange factory ones.

I believe I did, I screwed with that for a few minutes after getting in, kind like a "that's it? it doesn't go any further...?" However I did a homemade smoke test with a cigar and it did not seem to leak. In that area.


Originally Posted by 1FastBrick
Are you sure the intake throttle cable isn't pinched some were holding the throttle open???
Throttle cable is actually on the loose side, I checked that...

Originally Posted by 03sierraslt
I am really thinking a intake leak somewhere, at the gasket, a vacuum port not hooked up or something.
I just hopped on the bike (37 degrees out right now...) rode to Oreilys and got the intake manifold gaskets... God I hope this solves it. An hour job turned into a 10 hour thing. Ahhh

Originally Posted by AndysC3
what color are the manifold gaskets? the older ones are orange and are prone to leak. the updated one is green.
Orange... I have bought new ones. They are blue... not green like I read.
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Old 11-24-2012, 08:19 PM
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There not actuall dark green there more like a blue green. See attached picture.

If the original orange ones were nearly flat, then there leaking guaranteed ... The bead needs to be raised on both side's in order to seal properly.
Attached Thumbnails 5.3 Vortec runs like its Camming or at 4000 rpm with no throttle...-intake.jpg  
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Old 11-24-2012, 08:23 PM
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I hope the parts store is close, 37 on a bike sucks. Once its below 40 I loose interest.
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Old 11-24-2012, 08:41 PM
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Originally Posted by 03sierraslt
I hope the parts store is close, 37 on a bike sucks. Once its below 40 I loose interest.
About a 15 minute ride there, cursing the entire way as the wind hits my neck and a regret not wearing a baklava.... Had no choice.
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Old 11-24-2012, 09:18 PM
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Ohh ya, gotta cover all skin in that temp especially neck and chin. All this assuming you had a full face on.
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Old 11-24-2012, 10:54 PM
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Silly question but have you checked the codes yet? I notice the light flashing on your dash in the video...
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Old 11-24-2012, 11:31 PM
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Just had a thought after watching the Video. All though you said you put everything back together correctly, Inspect the Injector plugs. It's very easy for them not to be properly seated and cause a miss fire condition.
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Old 11-25-2012, 09:31 AM
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Originally Posted by 03sierraslt
Ohh ya, gotta cover all skin in that temp especially neck and chin. All this assuming you had a full face on.
For sure. No brain buckets here.

Originally Posted by N20zuki
Silly question but have you checked the codes yet? I notice the light flashing on your dash in the video...
I really need to buy a code reader.... Not yet tho

Originally Posted by 1FastBrick
Just had a thought after watching the Video. All though you said you put everything back together correctly, Inspect the Injector plugs. It's very easy for them not to be properly seated and cause a miss fire condition.
I think I've got them seat, I updated that now as soon as you crank it, straight up to 3500 RPM... No camming sputtering...


About to take the rest of my sunday and try again... I swear if this thing doesn't run by tomorrow morning...
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Old 11-25-2012, 11:46 AM
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Intake gasket fixed it.

Finally. Acted like it was going to do it again after I put it all back together again... then settled down.


Thanks all for the help.
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