had some problems the other night

[mattc]

well i was driving the truck around doing some logs and went over to a friends house, on the way home i got on the gas a little and let off, when i did this the valvetrain started making alot of noise sounds like a sewing machine sorta. i searched on ls1tech and alot of people say this is normal but its never made this noise before.

also when i pulled over to investigate the truck died and wouldnt start back up, i got under the hood and saw nothing physically wrong nothing leaking nothing disconnected, i did however see my belt tensioner gave out and tossed my belt. we got it back on and the truck still wouldn't crank, it would fire for 1-2 seconds then die immediatly, i reflashed a previous tune that i knew works and still nothing, put in my lastest tune again and nothing again as well. after scratching my head for a while we disconnected the battery for about 20 seconds and hooked it back up and she fired up just fine.

could all of this be related somehow? the louder noise makes me really nervous and by the time i got home after fixing the tensioner the truck wouldnt stay running on its own and took about 35% throttle to stay running. i had to go out of town so i havent had time to pull the valve covers or anything really to see whats going on, anyone had any experience with this type of problem?

[TRPLXL2]

We actually just had something similar happen, we had a sewing machine type noise in our 5.7 and from researching it said it was either piston slap or noisy lifters. Oil weight was also mentioned as being a big factor, we were running 10w30 Mobil 1 but we switched to 5w30 Mobil 1 and it's been quiet ever since.

As far as your second problem, I have a feeling it's a shorted wire. I had a ground wire from the oil pressure switch short out on me, and would cause all kinds of no start conditions and stalling. Mine would also restart when the battery was disconnected and left sit over night, I hope you find your problem!!

[mattc]

We actually just had something similar happen, we had a sewing machine type noise in our 5.7 and from researching it said it was either piston slap or noisy lifters. Oil weight was also mentioned as being a big factor, we were running 10w30 Mobil 1 but we switched to 5w30 Mobil 1 and it's been quiet ever since.

As far as your second problem, I have a feeling it's a shorted wire. I had a ground wire from the oil pressure switch short out on me, and would cause all kinds of no start conditions and stalling. Mine would also restart when the battery was disconnected and left sit over night, I hope you find your problem!!

well i'm already running 5w-30 mobil one synthetic i thought maybe if i changed the oil and went to something thicker it may help?

i also think the wire was a short or something but i have no proof and nothing to really give me any ideas i just hope it doesnt happen again lol.

the valvetrain noise really makes me nervous and i hope i didnt hurt anything by driving it home gonna be a long winter if this beast is already broke after only 200 or so miles on it lol.

[kerrige]

Bad gas can also cause these types of problems. I was running regular(85 in Utah) and when I switched to 88/91 it got a lot quieter and the KR went away.

[pl4yboy]

What springs are you using?

[mattc]

What springs are you using?

Comp Cams #26926 springs

got it all with the EPP cam kit from brutespeed

[ducky]

Pull the valve covers and check the rockers to see if the middles have come apart. Supposedly they are known to do that

[pl4yboy]

I'm not sure if those are double springs or not as I'm on my phone and don't have very good service ti check. Like David said, pull the valve covers and check the rockers, springs, and pushrods.

[mattc]

I'm not sure if those are double springs or not as I'm on my phone and don't have very good service ti check. Like David said, pull the valve covers and check the rockers, springs, and pushrods.

sorry yeah they are doubles

[pl4yboy]

sorry yeah they are doubles

You may have broken one of the inner springs.