2003 Silverado 1500 knocking when I start the engine
A single knock, sounding like a rod bearing knock, when the engine is started. This occurred in all climates/seasons. at the beginning we only the first 5 minutes, but in the last 4 days that knock is permanent.
I took the truck to the dealer when it was under waranty, but they said was normal. Now I gor 100,000 miles and the sound is permanent.
I hate this truck since the beginning , I hope not buy a GM anymore.
Re: 2003 Silverado 1500 knocking when I start the engine
I am not going to tell you that I can solve this but there are a couple of things you should try before you get an overhaul. If you have had this problem as long as you have had the truck like for several thousand miles, I think it is a lifter and not a rod bearing. A knocking rod bearing would have crashed big time after a few thousand miles. First drain your oil and replace it with naptha and run it for a few minutes and then drain it out. and replace it with a premium oil (not synthetic) one quart short of full. Then in place of the last quart add a quart of Lucas oil treatment. The objective is to break loose the sticking lifter. If this does not work try it again. You can use the same naptha and the same new oil with the Lucas treatment to go back in. This is a common problem with the silverado.
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Knocking and pinging are two separate things. "Knocking" usually refers to the sound an engine makes when internal mechanical parts, such as piston rod bearings or connecting rod bearings, begin to wear and cause a deep "knock, knock, knock" sound during engine rotation. "Pinging" refers to the tapping sound you get upon acceleration, either when using fuel that is to loo octane for the vehicle, or when static timing is set too far advanced, or when the cylinder heads are overheating due to clogged water channels or thin oil.
If you are hearing KNOCKING on the left side, it is likely time for an engine rebuild. If you are hearing PINGING, you may need a better grade of fuel, or you are way overdue for either an oil change or a major tune-up.
Sorry for this, but usually if the engine knocks on cold start then goes away shortly, it's a sign of a rod bearing. This is just one explanation but in any case it needs checked QUICKLY! This isn't a normal sound and can only lead to bad things if not fixed.
Most engine knocks/noise is caused by worn rod/main bearings or piston noise, you are sure this is not a valve follower tap? in any event unless it gets worse I would not be concerned, most of the knock noises are piston related and will not cause early failure of the engine, if it is deep hard knock u have a failed crank or rod bearing, this must be repaired as it will only get worse.
5.9s are notorius for upper cylinder carbon build up and as a service manager I have used B G 44K thru the fuel as a first attempt with good results. The cheaper snake oil is a total waste of time. If that does not due it try the bottle fed option. FIND a B.G. dealer on the net.If you can, borow a boroscope,dude, you are not alone so don't feel frustated OR tear down an excellent durable motor.
You may have a bad intake manifold gasket, which is leaking the antifreeze in to your engine. Note" Antifreeze is corrosive to the engine bearings" and the knocking your getting from the engine may be worn connecting rod bearing and the pistons are knocking till it warms up and expands to take up the space the worn bearings created. Replace the faulty gasket, change the engine oil and filter as much as possible to till you address the leak and add Restor engine treatment and Lucas oil treatment for now. This may stop or slow the knocking for now, but your going to have to tear the bottom end down and replace the crankshaft and connecting rod bearings if the knock has not gone away. As the weather starts to get colder, your going to have to warm up the engine before you start to drive, getting hard on the engine while it's still cold may cause the bearing to slip and then your looking at a bigger and more expensive job. Good luck and keep me posted.
This is a big sign that you might have a spun rod bearing if it's coming form your oil pan. Use a screwdriver and put the flat tip end on the oil pan and the plastic end near your ear like a stethascope and if you hear a knocking it's probaly a spun rod bearing or a bent or warped wrist pin on the bottom of your piston. So some good advice is to not run it anymore until you get it a mechanic to fix it. If you want to do it yourself you have a job ahead of you but refer to an Haynes Auto Repair Manual and you will have fun doing a job by yourself. I hoped this help!