Show 40 post s from this thread on one page. Do any of you L5P owners notice a tapping or knocking noise that is synched with engine rpm when you let off the accelerator and coast?Kantu store
It only seems to happen between 1, and rpm. It's not the typewriter tick, that's for sure. I'm probably just paranoid about the new platform, it's probably nothing.
I'd still like to know what causes the noise. Well I thought I'd noticed the same thing a time or two on mine already but wasn't real for sure. I've only got about miles on it so far. I noticed a little more engine noise on the one I took home over a weekend.
It isn't anything to worry about. It is just timing causing a little more noises than other years.Ford 6.7 Diesel Tick Tock Typewriter sound after oil change
Sent from my iPhone using Tapatalk. Crazy loud on mine, it would be cause for great concern to me if I hadn't seen what Kory posted awhile ago Awesome guys! I'm super psyched there is an explanation for this! Glad it's not trying to come apart already, but why in the heck would GM do such a thing?
Is there some benefit to it? Inquiring minds want to know They all do it to some degree. Look at an LB7 timing table, and how high the timing goes at 0 fuel. I always go in and bring it down to sane levels for coasting so you don't get that knocking sound during coasting. Another thing you may also notice is GM staggers when pilot turns off and on in the later trucks.
It doesn't just turn it off for all cylinders at the same time, but instead does them in sequences to lessen engine noise when pilot drops out. With the new controllers, GM may now be running multiple timing tables for each cylinder so that when pilot shuts off, those cylinders will run a different timing table than those with pilot active.
How much fuel is being injected at coast down? I'm surprised there is enough to cause a knock. I was under the impression that when coasting down the ecm cut fuel.
Shouldn't be any fuel injected so timing would be irrelevant. Unless it's making noise when the fuel comes back on to keep the engine from stalling. I tought this engine was more quiet?
It only takes a minute to sign up. Our car has been ticking while idling, and the noise gets louder and faster when accelerating. Oil has been changed regularly. Water pump was changed recently due to a leak. Not very car savvy, so I'm not sure what else to say about it Having the sound match RPM's certainly gives a clue that it is associated with the operation of the engine.
Many times a valve adjustment is required. This is a component of a regular maintenance schedule for almost all vehicles. A valve adjustment ensures that valve clearance between your camshaft and your valve actuator there are many different types is correct. As normal wear occurs on the motor the gap between the two increases until enough gap is there for you to begin to hear a ticking noise.
You can get a long screwdriver and place the tip on the valve cover of your engine. Then press the handle into your ear and push the tragus of your ear over the canal and you will be able to listen to the inside of the engine. If the valves need to be adjusted you will hear the ticking loud and clear from the valve cover.
I have a screwdrivers with 18" shafts that are easy to do this with. You could also use a steel or aluminum rod or any other long tool that can transfer the sound through it. It will need to metal. One possibility the other answer didn't mention is piston slap. A car with a piston slap can be driven, but the sound definitely affects resale value, as nobody wants a car with piston slap.
Piston slap is a ticking sound coming from the lower parts of the engine the pistons moving in the cylinders. If you have piston slap, you may need to replace the entire bottom half of the engine to get rid of the sound, as pistons typically aren't the only worn component -- typically, cylinders are worn as well.
Typically, it makes sense just to continue driving with the noisy engine, as the replacement of the bottom half is quite expensive.
However, is your sound piston slap? If the sound is worst when the engine is cold, it may very well be piston slap. Good cases of piston slap go completely away after the engine has warmed up for a while, whereas bad cases of piston slap can be heard even on a completely warmed up engine.
Sticky hydraulic lifters. Change the motor oil with Mobil 1 and substitute 1 quart with Marvel Mystery Oil. Run the car at highway speeds for miles and change the oil again, this time adding a half quart MMO.Edital xai xai 2020
I had the same problem with my Mercedes-Benz E and the problem was solved after three weeks of driving. Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Ticking noise while idling that increases with acceleration Ask Question.
Technical Service Bulletin: 2001-2015 Duramax Engine Ticking Noise
Asked 4 years, 2 months ago. Active 3 years, 1 month ago.Svg to base64 nodejs
Viewed k times.Just bought truck and haven't even gone thru a tank of diesel yet. I came up this hill and thought I'd floor it just to feel the power. Then all of the sudden a large knock developed in the engine. Knocks at idle and during accleration. The only time it doesn't knock is when you coast down hill no gas.
I thought it was something major like a spun bearing in the engine so I did and oil change and took the filter apart but saw no sign of metal bits. I'm thinking maybe an injector stuck open but no white smoke?
Would an injector stuck closed make a knocking sound? What else can I check? Compression test, balance rates. Also change your fuel filter if compression is ok. Do you have white smoke out of the oil fill neck? Might be the opposite stuck close or part way stuck. Check balance rates Mine knocked like crazy on the plus side! If it was stuck open besides white smoke you could possibly have fuel in your oil,do a wick test,and possibly heading towards a hydrolock if you keep driving amongst other things.
I'll check for white smoke out of filler neck. No white smoke out the filler neck. Well I took it to a diesel speciality shop and they checked the balance rates. Anyway, they told me all my injectors need replacing. The worst one was at 4.
Would a 4. Well they said they would have the truck back to me tomorrow. If it does solve the knocking issue then I guess they are right. I was thinking it was. You should have takin it somewhere else. They are dead wrong, those are perfectly acceptable balance rates.Usually at start-up it is loudest, and this may even cause a misfire condition on a particular cylinder. The noise seems to be rotational, usually about half the speed of the crankshaft.
You can usually remove the valve covers, and reinstall the coil packs to be able to run the engine with the valve covers removed. The noise is very much more discernible now, and moving from cylinder to cylinder with a screwdriver or other listening tool, you can locate which cylinder has the noise. Now, sometimes you may find a broken valve spring, but this is very rare on the 5. Once the noisy cylinders have been located, the head will have to come off next.
This involves removing the intake, exhaust manifolds, rockers and stands, sensors and wiring, accessories, etc. With either cylinder head removed, you can access the lifters. Once removed, pull out the lifters one by one. If you have a truck that has the Active Fuel Management system, you will notice that the lifters for cylinders 1, 7, 4, and 6 are different that the rest. These are the special lifters that can cancel out cylinders.
Visually inspect the lifters, and especially the rollers for deterioration. This will look like small metal chunks missing from the roller. This is most times the problem causing the noise and the misfires. Easily remedied by a set of new lifters. You should always replace all sixteen lifters when you do a job like this, even if only one is bad. Now, it is very important to check the camshaft lobes on the affected cylinders with bad lifters.
If enough time passes with the chipped up lifter roller continuing to run on the cam lobe, it will chew up the camshaft as well, and it will need to be replaced. This is a MUCH more involved job if you have to replace the camshaft. The front cover has to come off, the oil pan has to come off, the oil pump needs to be removed, etc. Luckily, most times you can catch this problem before the camshaft gets ruined, which is a good thing! It does get quite expensive to have this type of repair done at the dealership.
One word to the wise though…. My radio is out on my Chevy Silverado. Cannot tell from fuse diagram which is the one that controls it. Should be an easy check!
Thanks, I did not check the underhood box. The owners manual did not list a radio fuse on either box. The dealer recently replaced the oil pan gasket on my 08 Silverado 4. Anyone know what would cause this? Thank you. If does not sound like you actually have any sort of problem.
Maybe you just did not wait for the oil to fully drain back to the crank case before you checked it. Maybe the filter is not the correct size, so it does not hold the same capacity as it was with the filter that has been put on the truck in the past.The mill produces horsepower and pound-feet of torque, with the latter available at just 1, rpm.
Pretty much every part of the engine has been redesigned for improved strength and power: the engine block, heads, and crankshaft are all new, as is the boost control system. A damped oil pan and updates to the rocker covers help quell idle noise by a claimed 38 percent, and the oil cooler is said to have a percent greater capacity. The engine also has a new air intake system that uses a hood scoop to draw more fresh, cooler air into the turbocharger. The engine is paired to the same Allison six-speed automatic transmission as before, albeit with a new torque converter to cope with the increased torque rating.
Chevrolet today announced the redesigned Duramax 6. This next-generation redesign offers more horsepower and torque than ever — an SAE-certified horsepower kW and lb. Along with a 19 percent increase in max torque over the current Duramax 6.
In fact, engine noise at idle is reduced 38 percent. The new Duramax 6. A new, patent-pending vehicle air intake system — distinguished on the Silverado HD by a bold hood scoop — drives cool, dry air into the engine for sustained performance and cooler engine temperatures during difficult conditions, such as trailering on steep grades.
Cooler air helps the engine run better under load, especially in conditions where engine and transmission temperatures can rise quickly. That allows the Duramax to maintain more power and vehicle speed when trailering in the toughest conditions.
The intake design is another example of the advanced integration included in the Silverado HD that makes it over-the-road capable. As with previous versions, the new Duramax block features a strong cast-iron foundation known for its durability, with induction-hardened cylinder walls and five nodular iron main bearings.
It retains the same 4. A die-cast aluminum lower crankcase also strengthens the engine block and serves as the lower engine cover, while reducing its overall weight. The new engine block incorporates larger-diameter crankshaft connecting rod journals than the current engine, enabling the placement of a stronger crankshaft and increased bearing area to handle higher cylinder loads.
An enhanced oiling circuit, with higher flow capacity and a dedicated feed for the turbocharger, provides increased pressure at the turbo and faster oil delivery. Larger piston-cooling oil jets at the bottom of the cylinder bores spray up to twice the amount of engine oil into oil galleries under the crown of the pistons, contributing to lower engine temperature and greater durability. It consists of a laminated steel oil pan with an upper aluminum section.
The aluminum section provides strength-enhancing rigidity for the engine, but a pan made entirely of aluminum would radiate more noise, so the laminated steel lower section is added to dampen noise and vibration. Cut-then-rolled journal fillets contribute to its durability by strengthening the junction where the journals — the round sections on which the bearings slide — meet the webs that separate the main and rod journals.
The connecting rods are stronger, too, and incorporate a new degree split-angle design to allow the larger-diameter rod bearings to pass through the cylinder bores during engine assembly.
Chevy Silverado Engine Ticking Noise
A new, stronger cast-aluminum piston design tops off the rotating assembly.View Full Version : lb7 injectors loud under load and completely quiet once I hit rpm???
I have a 03 lb7. Starts awesome hot or cold no missing no smoke idles great runs good. Under load the injectors are loud but once I hit rpm the sound is gone completely out doesn't fade out it just stops like you flipped a switch. Does anyone have any idea's? It is annoying even with 5" exhaust and radio on you can still hear them ticking on the interstate. No fuel in the oil either. The truck has no tuning. Almost sounds like pilot timing Where are the lb7 guys??? Allot of these nuts run 2-stroke or trans fluid or motor oil and all sorts of crud in their tanks with fine results, personally I run standyne, power labs and schaffers, separately of course.
I'm not sure the history on the injectors but the truck was owned by the government since new. It has k on it now. I have put about 4k miles on it. I put fuel additive in every time I get diesel. Which has made them a tad quieter. I also added a fass titanium and put a new filter on the engine.
The truck runs great starts perfect even when 10 degrees out neve misses or smokes and all balance rates are in spec. They are noisy and right at rpm they get completely quiet but the truck still runs and pulls just as good. By the way I use Schaffer oil and additive for the fuel. Guess I'm a nut for using 2 stroke :rolleyes: sound normal to me I believe the amount of pilot decrease before that rpm but I don't have my laptop in front of me.
Lol, I meant that in the best of taste :angel: That's the dark side of diesels to me, I'm afraid of the dark I run the walmart 2 stroke oil mixed with diesel Kleen. My injectors always seemed noisey even after the dealer replaced them. When I removed the lift pump before I sold the truck.
The injectors were way more noticeable. All injectors were within spec too. They were loud before the lift pump. So I installed it just in case.
They did get quieter a little with fuel treatment. I may try some 2 stroke oil. It's just annoying. And when I start the lb7 lly lbz lmm at work all of them are quiet. Can not hardly hear the injectors. Mine is obviousCustomers may also comment about hearing a tick noise inside the vehicle at idle such as when sitting at a drive through window.
Engine build variation from engine to engine contributes to differences in perceived volume. This noise is caused by the relationship of the engine cylinder block, crankshaft journals, bearing inserts and the oil film.
This relationship may allow a vibration that resonates through the cylinder block and is heard as a metallic ticking noise. The noise could be described as an irregular ticking or clacking sound, like random typing on a mechanical typewriter. This condition has been present in diesel engines produced for the last 20 or more years.
The overall noise reduction in engines produced today makes this noise seem new when, in fact, it was masked by other noises in the past. Many manufacturers such as Isuzu, Hino, Mitsubishi, and Nissan report a similar condition in their diesel engines.
Testing and engine teardowns with this condition reveal no condition that would affect reliability or durability of this engine.
Dealers should not attempt to compare any customer vehicles exhibiting this noise with other similar vehicles as the noise is different from vehicle to vehicle and this may lead to the incorrect conclusion that the vehicle has a condition. This noise is a normal operating characteristic of the engine. This noise has no short or long term effects on the engine.
Do not attempt repairs for this noise. Please share the information found in this bulletin with customers who inquire about this condition. In the event they have additional questions or concerns, please advise them to contact Customer Assistance at the numbers listed below for further information. Search for:. Please discard Corporate Bulletin Number N. The contents of HotShotsSecret.Heil mic settings
Need Help? Talk to an expert Contact Us. This bulletin has been revised to add the Model Years.
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