2000 Gmc Sierra/Chevy Silverado 5.3 cold starts
Just wondering if any one else has had a problem
with a knocking or rapping noise from the 5.3 V8
only for about three seconds on start up,in fact
you may not hear it unless you stand outside the
truck and start it,and only on cold or first
morning starts after sitting all night, once
started the engine runs fine and is quite. this
started on my 2000 GMC Sierra ext cab SLE Z-85(the
about 3300 miles, thinking maybe a plugged or
restricted oil filter causing valve train noise I
changed the oil, 5-30 as the book says and the
pf-59 delco filter, no change, same noise, did a
little checking around and tried a better oil
filter(better check valve for drain back)mobile 1
filter did help a little as does idling the engine
@ 1000 rpm for a few seconds before turning the
engine off,Have spoken to the dealer and they say
it is a wrist pin on one of the pistons and will
cause no damage and will run for 100,000 miles,
ummm I wonder ?? Thanks for any help in this
matter, other than this problem I love the truck
with a knocking or rapping noise from the 5.3 V8
only for about three seconds on start up,in fact
you may not hear it unless you stand outside the
truck and start it,and only on cold or first
morning starts after sitting all night, once
started the engine runs fine and is quite. this
started on my 2000 GMC Sierra ext cab SLE Z-85(the
about 3300 miles, thinking maybe a plugged or
restricted oil filter causing valve train noise I
changed the oil, 5-30 as the book says and the
pf-59 delco filter, no change, same noise, did a
little checking around and tried a better oil
filter(better check valve for drain back)mobile 1
filter did help a little as does idling the engine
@ 1000 rpm for a few seconds before turning the
engine off,Have spoken to the dealer and they say
it is a wrist pin on one of the pistons and will
cause no damage and will run for 100,000 miles,
ummm I wonder ?? Thanks for any help in this
matter, other than this problem I love the truck
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Comments
2000 w/ 5.3 and heard this same noise at the
bottom end. asked several dealers about and was
told that some top and/or bottom noise is normal.
have listened to several different 5.3's
including guys i hang out with and noise is same.
mine was worse with mobil #206 filter so i went
back to PF59. sounds more like rod play rather
than wrist pin. one service also told me that rod
clearence is a noticable noise on the new
engines.
hope this helps to take out some of the fear.
...RED
On the filter issue, my filter stands straight up so I see no way oil could drain out of the filter while it is parked. Is this why you were trying the different filters?
to post #4 this motor uses hydaulic roller lifters, they are not solid lifters. This motor is basically an LS1, as is in the Camaro and Vette.
I actually don't hear any noise on an overnight cold startup. Mine occurs after I have driven it to get to full operating temperature and shut the engine off for a few minutes and restart it. The clicking only lasts for about 2 seconds then goes away.
What are your alls oil pressure guages registering? Mine shows about75-78 while cold idleing and 55-60 while hot idleing.
Has anyone tried the 10w-30. I think this is the oil viscosity gm says you can use in warmer climates. If so, did it help any?
play in steering wheel shaft adjusted for side
play. while it was there they checked into my
engine noise(was concerned about possible
detination) and they confirmed that the new
Vortec's are setup with slightly more rod
clearance than older 350's. that is why as i'm
told that you sometimes hear a knock sound when
you first start after engine is warm. we had an
olds than had these same symptoms and it never
burned a drop of oil, but it sure ran like an
animal.
...RED
In response to post #3 ,in my case with my truck I have not heard the noise at any time other than the first few seconds on a cold start, normally the first start of the day.I did run my engine up and down through the rpm ranges you spoke about,in fact in my case after the first few seconds my engine doesn't sound to bad.
In response to post #7,yes I did try 10-30 as the book says for warmer weather and it made the problem even worst on cool morning starts so I went back to 5-30 , fastest oil change ever. As for the detonation, this is the first time I have heard of this problem,from what you know do you think this would be only for a few seconds on a cold start and never any other time?in my case I still think it may be mechanical or oil related , my engine only makes this knocking or raping for a few seconds on cold starts the only difference between the first start and the rest of the day is engine temp and the amount of oil up in the engine. at the time I am getting the noise the engine has not changed temp from start up and in just a few seconds the the noise is gone? this leads me back to the oil and keeping it up in the engine over night.back to the detonation you spoke of , are you saying higher octane or lower octane is better I have run 93 or 94 since the first tank. well I hope someone can use this info, I am starting to look at it like I have 5 years or 75k before it really becomes my problem so I am going to keep asking questions and keep my ears open and hope for the best , while trying to to enjoy the truck rather than check out every new noise , I guess it doesn't matter how much you spend these days they all come with problems.
Like you say, all vehicles have their problems, but I love this truck.
It may return later, but for now it's ok.
gmc sierra
Peter
gmcsierra - That could be some unburned fuel detonating in the hot cat.
Your "upside down pistons" had me LOL.
mrurl,
For the life of me, I can not imagine how pistons could be installed 180 degrees wrong. Even if GM did something idiotic like put the skirts on the pistons parallel to the wrist pin it still wouldn't make any difference. If the piston skirt wasn't destroyed on the first revolution the engine ever turned, they would never be. I'm sorry but I just can't see noise caused by a piston 180 degrees out!
That assistant service manager just might try to sell you some new muffler bearings too.
Rich
this topic is being "frozen." It will be archived or deleted in the next 10 days or so.
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