Both test sequences came up with nothing. It's not bad in a way where you do it a few times and something bad will happen. Thanks for contributing an answer to Motor Vehicle Maintenance & Repair Stack Exchange! On a very cold engine or while lean (not enough fuel), it is easier to get a larger thermal differentiation between the cylinder liner and piston rings. Why will the engine wear? Then you’ll have metal fragments flying around destroying the head and cylinder. The other likely scenario is that the problem is emissions-related and you have a bad sensor of some kind. https://www.youtube.com/watch?v=1LkxGx5WJzA. I know they deserve it. Continued: The "unnecessary wear" part seems reasonable, though, although that's kind of a default assured consequence of, (Also fwiw, anecdotally, I was diagnosing a cooling issue on my car recently, a 2001 Honda Prelude, 190k miles. Some poorly designed oil pumps (and water pumps too) can aerate and are unable to pump oil when increased in rpm too rapidly. If nothing turns up on the scan, have him clean the throttle. The next two points are much more common in performance engines where the manufacturer has tweaked output leaving no room for improvement. I have a 2007 Honda Civic. I pulled up at a light the other day next to a kid driving (what I assume to be) his dads 5.0 Mustang. Can revving the engine in neutral cause damage? That said, throttles can stick open; I've experienced several. Depending on the year/model, the rev limiter will not allow you to redline in neutral.It will cut off the engine before the rpms can do damage. Get up-to-the-minute news sent straight to your device. (not an exhaustive list): Rapidly revving an engine will heat up the piston rings much faster. The secondary is that you are turning the engine and naturally wearing it without moving the car. When the transmission is in neutral and the engine is “revved” without any load, the spinning engine internals will accelerate, gathering rotational and lateral forces at a faster rate than designed by the manufacturer. Enjoy more articles by logging in or creating a free account. How do you say "I think she loves me" in Latin? Because they have a much smaller thermal mass than the cylinder liners they expand at different rates. However the engine would most likely already be overheating for this to occur. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Improvements in Saturn V, LM and CSM after Apollo 10, Version Control For Salesforce — Branching Strategy. This is common in performance & motorsport engines so they have increased strength built into the block by adding more ribs and webbing to the cast or billet. Sometimes, putting a car in neutral is the best way to avoid an accident. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. Motor Vehicle Maintenance & Repair Stack Exchange is a question and answer site for mechanics and DIY enthusiast owners of cars, trucks, and motorcycles. The kit also comes with spring-loaded clips that hold the pads in place. If the engine has tight tolerances it will also bend valves. It only takes a thou or two (0.0254 - 0.0508 millimetres) for the crankshaft to gouge a main bearing. The brake will easily overpower the engine in every reasonably well-maintained vehicle. The rumor was that revving your engine in neutral, when the engine wasn't under load, could cause damage. It’s usually coated in Teflon or something that will not squeak. The person seeking my advice typically ignores my question and, panic rising, asks, "But what if it goes into reverse or park?" Engines that are not serviced have dirty oil systems and are prone to blockages at high rpm. Why does the US death rate not "match" life expectancy. I agree that it’s probably not safety related. is either "Nothing" or "You can't. If they are allowed to move around too much, they oscillate very quickly, and produce a high-pitched squeal. If the Check Engine light does come on, it will store a code for perhaps as long as a few weeks so that your mechanic can scan the engine with his scan tool and see which sensor is reporting a reading that’s out of range. No credit card required. Still, when people ask me about unintended acceleration and I say, "Put it in neutral," the response is almost always the same: "But won't that blow up the engine?" This means that the engine will operate in the higher threshold of temperature. The cooling system on your car needs air to pass through the radiator to effectively cool down the engine. What is the difference between “affirm” and “acknowledged”? New cars with electronically controlled transmissions might not have such physical barriers, but they'll ignore your inappropriate request to park or go in reverse while you're moving. To learn more, see our tips on writing great answers. We may earn commission if you buy from a link. (Slap the gear selector, not the teen. I can only think of a bad thing when revving high in neutral is when u just startup and the oil hasnt lubricate the engine completely yet...it could cause some wear...i would imagine revving in neutral is alot better cuz the engine is only pull it's own's weight and not the weight of the drivetrain...the only diff is that revving in neutral will get u to the limiter faster than when pulling the wheels and u can … Revving out your car in neutral is fine as long as you watch your engine temperatures. But it may be that you waited too long and the Check Engine code had cleared itself. What do negative phonon frequencies signify? I know that what I am experiencing is real. After years as a driving instructor, and thanks to rental car companies that apparently lost their minds and let me loose with their vehicles, I can assure you: Your engine won't let you destroy it (at least not like this). And if you have 150,000 miles on this car, I probably would replace the oxygen sensor, too, since you likely need one anyway. Some early rev limiters implemented used a fuel only cut which could cause a cylinder to lean out "slowly" and develop a piston hot spot from detonation. What should I do? Contrary to other comments & answers given, the cooling system is NOT able to help, as piston failure happens within 4-10 milliseconds after a hotspot develops on a piston or compression ring. Yes, coasting in neutral requires the engine to idle using fuel but that is almost "free momentum". Plot3D Equation of motion of a particle in a surface. So, I’ll give you a few things to check. You won't be able to accelerate no matter how hard you hit the gas if the car is in neutral. Consider the occasional claims of sudden acceleration (aka unintended acceleration). If the throttle is truly stuck, shifting into neutral will prevent the car from accelerating. Usually, the first thing shops will try is to add some special grease to the backs and ends of the pads. The problem will be worsened if the car already has cooling problems. So how do you address it? That helps, but it can wear off. The dry sump system is a good example. Does stopping the engine while it is still moving/turning damage my car? It only takes a minute to sign up. Intermitten engine revving has many likely causes. Or that the problem occurs so infrequently that the computer doesn’t have enough data to show a pending code. That could very well be the source of the problem. The ability to slow a learner's-permit-holding teen with a quick slap into neutral quells many parents' fears. If it has, and you didn’t tell us that, we’re going to penalize you 15 yards for withholding information, Howard. in a "loaded" engine, the large charge and therefore high compression pressure, cushions the piston action. But don't.). I do get the feeling that even though people seek a general answer to this question, that it's actually highly specific to the vehicle. For sever-al years, I have been experiencing an intermittent problem. How does raw fuel damage the catalytic converter? If you are in neutral odds are you aren’t moving forward or aren’t moving forward that quickly.

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