Lets talk about my KR (update 11-28) - Page 8 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 11-26-2007, 09:12 PM   #71
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Quote:
Originally Posted by TJ'sblackbonne
Lets hope it isnt something internal causing this. I am also going to switch out the knock sensors with the other ones i have. I figure might as well try it. Any ideas on things that maybe causing internal noise?
Maybe the harmonics of the 105# springs?
Or..
You definitely don't have an exhaust leak right?
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Old 11-26-2007, 09:27 PM   #72
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I dunno bout the springs.


I cant hear an exhaust leak, but i guess it maybe possible. Is there any way to check say the manifolds to make sure they arent leaking. I did reuse the gasket on the front for the plog so i mean maybe. Can i like spray it kinda like checking for a vac leak. any suggestions?
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Old 11-26-2007, 10:54 PM   #73
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ive never tried it for exhaust, but would the soap water trick work on hot exhaust? it should.
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Old 11-26-2007, 10:57 PM   #74
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well what i do is put my hand near the exhaust you will feel the hot air if there a leak
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Old 11-26-2007, 11:04 PM   #75
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TJ, an exhaust leak will tick. You should also see carbon tracing near the leak on the cylinder head. Use a flashlight and a mirror on a dark night (no ambient light).

Don't rule out cracks in the rear manifold.

Don and I were talking about the possibility of a wrist pin. He had the same symptoms on his with that as a root cause.
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Old 11-26-2007, 11:06 PM   #76
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Quote:
Originally Posted by samueljackson
ive never tried it for exhaust, but would the soap water trick work on hot exhaust? it should.
maybe on cold manifolds, but definitely dont try that on aan already warm engine.

and would that leave a dis-coloration on the em'*?
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Old 11-26-2007, 11:20 PM   #77
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Quote:
Originally Posted by willwren
TJ, an exhaust leak will tick. You should also see carbon tracing near the leak on the cylinder head. Use a flashlight and a mirror on a dark night (no ambient light).

Don't rule out cracks in the rear manifold.

Don and I were talking about the possibility of a wrist pin. He had the same symptoms on his with that as a root cause.
Thats been on the back of my mind as I have been following this thread.. At first I couldn't hear the wrist pin tap.... But every now and again the PCM would pick it up bit by bit... It got worse to the point it was all around KR just about all of the time... I had KR at light throttle and it pulled timing like H*** at 2700 Rpms

I'm thinking you should see KR at 4500-6000.... I would think if you were short on fuel and you may be on the top end, I wouldn't think you'd have KR so low down in the band...

But I'll wait and see what TJ figures out

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Old 11-27-2007, 08:40 AM   #78
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see what confuses me, is this motor ran perfet before the cam install. No hiccups at all.

So that is why i am thinking something cam related. not enough fuel, possible exhaust leak, bumped a knock sensor on motor reinstall, ect, ect.
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Old 11-27-2007, 12:26 PM   #79
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Quote:
Originally Posted by TJ'sblackbonne
see what confuses me, is this motor ran perfet before the cam install. No hiccups at all.

So that is why i am thinking something cam related. not enough fuel, possible exhaust leak, bumped a knock sensor on motor reinstall, ect, ect.
Don't discount the possibility there could be a problem with the cam itself. It'* possible it wasn't ground right and maybe a lobe is off causing a lifter tick deep in the engine that only the knock sensor can pick up. There are all sorts of things that could be wrong here, mechanically, that could be causing this false KR. But like I said before lets get the fuel taken care of and then see what can be done with the KR.

Concerning finding exhaust leaks, I have a trick way of doing this. Go get yourself one of those automotive stethoscopes that has the mini-megaphone looking attachment for it. Then, with the engine running, move this probe over all exhaust components and mating surfaces to see if you can hear anything puffing out at the probe. This thing also works great for finding vacuum leaks or narrowing down rocker ticks.

-ryan
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Old 11-27-2007, 01:42 PM   #80
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I'm right there with you on the need for bigger injectors, TJ.

With all my little nickel-and-dime L36 mods (PLIM, PEM, L67 TB, GAB/K&N, 2.5"DP, hi-flow cat) plus SR rockers, my WOT IPW'* lead me to believe that, once I ditch the rockers and go to a GT1 cam, I'll need bigger injectors, too.
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