Last post on Jul 22, 2000 at 4:19 PM
You are in the Pickups - Archived Discussions
#9 of 28 rod clearance... (redsilverado)
Apr 21, 2000 (2:38 am)
picked up my truck today from service, was having
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
#10 of 28 thanks for the responses
Apr 21, 2000 (9:22 pm)
Thanks for the responses to my original posting about engine noise on cold starts. I guess it is good to know that I am not the only one hearing these things. in reference to post #2, it doesn't matter where or how your oil filter is mounted to the engine,the oil filter has a drain back valve or what you could call a check vale to prevent the oil that is in the upper lubrication system of the engine from draining back into the oil pan through the oil filter and then causing the oil pump to have to fill the whole system before the oil gets to where it is needed, the drain back valves as they are called are made of different materials on different filters , I guess most are OK and will do the job but I have read that you should stay away from fram filters, in fact most of the filters are made by one company for all the other brand names, So far I have tried the delco PF59 that that came on the truck and I also have tried the Mobile 1 oil filter (#206) which was rated very high,the difference in price (cost of the mobile 1 is like three times as much as the PF59)so far has not made that much difference in the noise. however the the mobile 1 filter did improve the problem somewhat . I am going to try the purolater pureone next oil change also a well rated filter. The other thing I talked about was the Z-85 pkg on my truck, it comes with an oil cooler which means more places to pump oil before it gets to where it is needed, just wondered if anyone with this noise also has the Z-85 or the oil cooler option. I have read that on the old 350's with oil cooler options they had problems.
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.
#11 of 28 Detonation problem
Apr 22, 2000 (2:19 am)
Actually the detonation I was speaking of was when driving. I heard a slight pinging/ticking at the dr side rear of the motor when pulling hills at around 1100 rpm. Had a friend ride with me and he heard it on passenger side too. I switched from 87 to 89 octane and this went away. On the other hand it did not affect the start-up noise. I think I misread an earlier post on that part of it. Seems to me like 93 is an over kill for this motor unless your using one of the Hypertech programmers to change the ignition advance curve.
Like you say, all vehicles have their problems, but I love this truck.
#12 of 28 Warm start detonation
Apr 27, 2000 (3:31 am)
I have a 2000 LS 1500 with the 4.8 V8 with 1400 miles on it. I also get detonation if the truck is fully warmed up - shut off - and restarted within 10 minutes or so. The "pinging noise" only seems to be there during the 1 or 2 seconds it takes to start the engine. Should I have the dealer look at it? Love the truck - no problems at all - so far!
#13 of 28 Warm start detonation
May 14, 2000 (7:39 am)
Yep,I have it,it's slight,but I could hear it tonight when I left for work.I kind of figured it was going to do it,my friend's Camaro does it,and another friend's 99 Silverado too.It just does ONE "CLACK",and that's it,so far..
#14 of 28 Silverado cold starts
May 24, 2000 (11:37 pm)
I must add my name to the list of people experiencing what sounds like lifters for 10-20 seconds during cold start. The dealer reconized the symptom's and stated GM was aware of the problem which was actually carbon build-up on the cylinder walls. The recommended fix was to soak each cylinder with a solvent overnight. This did not work and by the way while they were working on my truck when two more came in with the same problem and experienced the same result. GM has no solution at this time. I have requested a extended warranty until they solve the problem. No response yet. 99 1/2 5.3 24k mi
#15 of 28 Mine is gone now
May 25, 2000 (12:22 am)
I just changed my oil the other day at 1600 miles give or take a few. That break in oil was really thin!!! Put on a new pf59 filter and topped it off with 5w-30 Mobil 1 (non-synthetic) and that little ticking noise is gone for now. Also clicking off better gas mileage since the change(about 1 mpg) overall.
It may return later, but for now it's ok.
Jun 06, 2000 (12:13 am)
The cold knocking is most likely your rod bearings. Several months ago there were alot of post on this. The rod bearings will go out and actually lock the motor up.
Jun 06, 2000 (6:09 am)
Usually when a car had a rod getting ready to go, the "seller" would put a heavier grade of oil to hide the noise.
Jun 07, 2000 (1:10 am)
Maybe ford could take a que and make their motors knock too, because when I blew the cracked doors off that 5.4 today, he was really ticked. Just a thought!