5.3 First Startup Noisy - The 1947 - Present Chevrolet & GMC Truck Message Board Network

steve aleve · 03-06-2015, 06:46 PM

I wanted to post this because I have been building a 5.3 with an LS1 intake for my 55.1 chevy 3100 and finally took a stab at the first start up. It took about three or four attempts to get it to start and here is the video. It was a bit louder than I expected. I have since hooked up an oil pressure gauge and on the next start up I will check the oil pressure, and also check to see if there are any exhaust leaks. Other than that... any thoughts on what else may be going on?

More info: the engine had about 100 thousand miles on it (had roller tick) I swapped the cam and rollers. I fabbed the x pipe and the mufflers are stock c6 mufflers. its a 4l60e transmission from CL... starter is from CL... Throttle body, alternator and water pump are from CL...

http://youtu.be/o0T7nx_A7R4

Marty68 · 03-06-2015, 08:31 PM

was it an exhaust manifold leak?

**Hart_Rod** · 03-06-2015, 09:36 PM

How much lift does the cam have? Did you check the pushrod length?

steve aleve · 03-06-2015, 11:37 PM

I hope it's exhaust leaks. I'm going to start it up and going to check the exhaust tomorrow and it's a stock corvette cam so I didn't think it would cause trouble. Is this still a possibility?

BR3W CITY · 03-07-2015, 02:26 AM

Obviously a cell phone camera + people talking during video + being really short doesn't give us a ton to work with.

Tell us what the oil pressure is (and if its coming up right away, or bouncing around/with rpm).

The loud puffing is the just the intake huffing without a filter (and you were standing right by it), but thats not the problem. I feel like I hear valvetrain noise, but the exhaust leak can easily mislead.

Is it sputtering/dieseling at all or is that just the low idle in the video?

homemade87 · 03-07-2015, 10:48 AM

Once you get it running fair enough to get a good heat cycle in it the lifters should quiet down . It also sounds like it has the lope of a cylinder not firing at low idle. I would verify this by a inferred gun on the exhaust manifold if you have one . These ls injectors are bad to stick if they sit for a while .

Also the engine will be louder with no body over it . Makes a bid difference. Looks like things are coming together .

steve aleve · 03-07-2015, 06:52 PM

Thanks all for the help!!! I had a chance to start it up again today and I found some vacuum leaks, a couple exhaust leaks and br3w city, you are right... The intake was huffing quite loudly. I fixed my leaks and the idle smoothed out very nicely. I also got my oil pressure gauge hooked up and at idle I'm getting about 30 psi. I'll have to look and see what these engines are supposed to run at but at least now I know oil is moving through the engine!!! Hopefully I'll have another video to post soon!!! Thanks again

steve aleve · 03-09-2015, 05:28 PM

So here it is now...

Thanks again for the comments!

http://youtu.be/C2HLgiFoXOE

03-06-2015, 06:46 PM	#1
steve aleve Registered User Join Date: Nov 2012 Location: Albuquerque New Mexico Posts: 187	5.3 First Startup Noisy I wanted to post this because I have been building a 5.3 with an LS1 intake for my 55.1 chevy 3100 and finally took a stab at the first start up. It took about three or four attempts to get it to start and here is the video. It was a bit louder than I expected. I have since hooked up an oil pressure gauge and on the next start up I will check the oil pressure, and also check to see if there are any exhaust leaks. Other than that... any thoughts on what else may be going on? More info: the engine had about 100 thousand miles on it (had roller tick) I swapped the cam and rollers. I fabbed the x pipe and the mufflers are stock c6 mufflers. its a 4l60e transmission from CL... starter is from CL... Throttle body, alternator and water pump are from CL... http://youtu.be/o0T7nx_A7R4

03-06-2015, 08:31 PM	#2
Marty68 Registered User Join Date: Nov 2014 Location: west coast, Wi Posts: 534	Re: 5.3 First Startup Noisy was it an exhaust manifold leak?

03-06-2015, 09:36 PM	#3
Hart_Rod ************* Join Date: Apr 2005 Location: Pensacola, FL Posts: 17,835	Re: 5.3 First Startup Noisy How much lift does the cam have? Did you check the pushrod length? __________________ Rob - https://www.instagram.com/hart_rod_c10 As Iron Sharpens Iron, So One Man Sharpens Another. Proverbs 27:17 FOR SALE: DBW pedal bracket - http://67-72chevytrucks.com/vboard/s...d.php?t=651123 FOR SALE: Hood Brackets http://67-72chevytrucks.com/vboard/s...d.php?t=679945 1987 Silverado SWB - 34.5K original miles http://67-72chevytrucks.com/vboard/s...d.php?t=801834 1969 SuperBurb - http://67-72chevytrucks.com/vboard/s...d.php?t=200387 1968 Farm truck - http://67-72chevytrucks.com/vboard/s...d.php?t=358692 1968 SWB - http://67-72chevytrucks.com/vboard/s...d.php?t=551258 1948 Chevy - http://67-72chevytrucks.com/vboard/s...=122164&page=3

03-06-2015, 11:37 PM	#4
steve aleve Registered User Join Date: Nov 2012 Location: Albuquerque New Mexico Posts: 187	Re: 5.3 First Startup Noisy I hope it's exhaust leaks. I'm going to start it up and going to check the exhaust tomorrow and it's a stock corvette cam so I didn't think it would cause trouble. Is this still a possibility?

03-07-2015, 02:26 AM	#5
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: 5.3 First Startup Noisy Obviously a cell phone camera + people talking during video + being really short doesn't give us a ton to work with. Tell us what the oil pressure is (and if its coming up right away, or bouncing around/with rpm). The loud puffing is the just the intake huffing without a filter (and you were standing right by it), but thats not the problem. I feel like I hear valvetrain noise, but the exhaust leak can easily mislead. Is it sputtering/dieseling at all or is that just the low idle in the video? __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

03-07-2015, 10:48 AM	#6
homemade87 Registered User Join Date: Apr 2010 Location: Guntersville Alabama Posts: 1,073	Re: 5.3 First Startup Noisy Once you get it running fair enough to get a good heat cycle in it the lifters should quiet down . It also sounds like it has the lope of a cylinder not firing at low idle. I would verify this by a inferred gun on the exhaust manifold if you have one . These ls injectors are bad to stick if they sit for a while . Also the engine will be louder with no body over it . Makes a bid difference. Looks like things are coming together .

03-07-2015, 06:52 PM	#7
steve aleve Registered User Join Date: Nov 2012 Location: Albuquerque New Mexico Posts: 187	Re: 5.3 First Startup Noisy Thanks all for the help!!! I had a chance to start it up again today and I found some vacuum leaks, a couple exhaust leaks and br3w city, you are right... The intake was huffing quite loudly. I fixed my leaks and the idle smoothed out very nicely. I also got my oil pressure gauge hooked up and at idle I'm getting about 30 psi. I'll have to look and see what these engines are supposed to run at but at least now I know oil is moving through the engine!!! Hopefully I'll have another video to post soon!!! Thanks again

03-09-2015, 05:28 PM	#8
steve aleve Registered User Join Date: Nov 2012 Location: Albuquerque New Mexico Posts: 187	Re: 5.3 First Startup Noisy So here it is now... Thanks again for the comments! http://youtu.be/C2HLgiFoXOE



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