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58 votes

How do cars drive through deep water as shown on many videos online?

One of your questions as stated and not answered is: What is the recommended thing to do if you need to pass through an area that's been flooded? The answer to this has nothing to do with ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
56 votes

Accidentally left car idling for 14 hours. What are possible consequences from this?

There's probably no damage at all, the engine just ran at low revs for a long time. One issue you may have is if it ran out of fuel the line may have sucked sediment from the bottom of the fuel tank ...
GdD's user avatar
  • 17k
46 votes
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Why is engine displacement frequently a few CCs below an exact number?

There are regional taxation and tariff issues associated with displacement Manufacturers will intentionally keep their displacement just under a limit that may increase their local/regional taxation ...
DucatiKiller's user avatar
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46 votes
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If I am just replacing the car engine, do I need to replace the odometer as well?

I wouldn't touch the odometer. The rule I always subscribe to is that the odometer measures how far the chassis has rolled. Otherwise a person could go mad trying to figure out which repairs/...
smitelli's user avatar
  • 574
44 votes

Spark plug broke off in engine - can I drive the car?

That sounds very risky to me. The portions of the plugs that reside in the combustion chamber are designed to tolerate the heat and pressure there. I don't think they will melt. So what will happen ...
dlu's user avatar
  • 14.5k
40 votes
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Is it really impossible to fix a seized engine?

A seized engine due to not being used is usually due to the pistons / rings sticking in the bore, which with some freeing fluid may be easily solved, but this will not help the future life of the ...
Solar Mike's user avatar
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39 votes
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Why do manufacturers detune engines?

I'd be tempted to restate the question as "How do vehicle manufacturers decide what to tune for?" For the question as asked, there are a lot of possible reasons, and probably no way to know in a ...
dlu's user avatar
  • 14.5k
39 votes
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How do cars drive through deep water as shown on many videos online?

The term you're looking for is Wading Depth which is specified by the manufacturer. They may surprise you, and its info you should know about your vehicle. Its in your manual, or search it online. ...
Criggie's user avatar
  • 2,958
36 votes

Is it really impossible to fix a seized engine?

It's not practical to attempt a repair on that engine; it's toast. It also doesn't sound like you're in a position to do an engine replacement yourself, so you're now looking at a math problem rather ...
PeteCon's user avatar
  • 8,712
35 votes
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Do I need to take special care of my new motorcycle in this particular scenario?

When it comes to running procedures the guidance in the owners manual overrides generalized advice on the internet. If the manufacturer intended for there to be speed restriction (or more likely an ...
motosubatsu's user avatar
  • 10.1k
34 votes
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We have fuel injection, why not air injection?

Simple reason: volume. @ 14.7:1 stoich, your input into the cylinder would need to be 14.7x bigger (or push that much more) through a nozzle than you would the fluid which is fuel. You state it would ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
33 votes

Spark plug broke off in engine - can I drive the car?

Do NOT drive a car with a piece of sparkplug inside the engine. It can (and likely will) lead to serious damage (up to a catastrophic engine failure). Get your car towed to a service and have the ...
Jakub's user avatar
  • 581
32 votes

How can you tell if the engine is not brand new?

Engines have an "engine stamp." Find it, write down the numbers on it and call the Mazda Head Office for your region (delearship can't always help for this). They will tell you which car the engine ...
tlhIngan's user avatar
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28 votes
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proper oil for 1940's era aluminum ford engine

Per @Eric Urban's suggestion, I found the Technical Manual for the M4A3 tank published in 1942. That tank did use the aluminum Ford GAA 18L V8 engine which produces 500 hp at 2600 RPM! It says: ...
Zach Mierzejewski's user avatar
27 votes
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When is an engine flush a good idea?

An engine flush is basically the process in which a mechanic puts chemicals in the engine oil to break down sludge or carbon deposits from old oil. The difficulty with it is that it can break down ...
anonymous2's user avatar
  • 5,235
27 votes
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What should always be replaced when rebuilding an engine?

If the intent is strictly to rebuild, here is a list of items which should always be replaced: Rings Compression rings Oil control rings Bearings Main bearings Rod bearings Cam bearings (not ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
27 votes

What does O/D mean on a dashboard & a button under the transmission button?

As others have noted, the O/D button is used to disable and enable the overdrive gear. What hasn't been discussed is why you might want to use this button, and in what circumstances. The vehicle you ...
J...'s user avatar
  • 692
26 votes

We have fuel injection, why not air injection?

You have almost but not quite described the operation of either a Turbocharger or Supercharger. The idea of the air under pressure being injected from a common fuel rail would likely not work as it ...
Steve Matthews's user avatar
26 votes

Is my head gasket cracked?

It is totally possible. Combustion chambers are quite small and it doesn't take much fluid to fill one up. As the piston goes down during the intake cycle, a vacuum is created and anything in the ...
Thomas's user avatar
  • 708
26 votes

How can I disable my 2002 Ford Explorer so someone with a key can't start it?

If your friend is moving your vehicle without your consent and does so deliberately your friend is committing a crime. Vehicle theft. If you are asleep when this happens then consent was not given. I ...
Old_Fossil's user avatar
  • 3,962
26 votes

How can I disable my 2002 Ford Explorer so someone with a key can't start it?

I'll make it very simple for you, Dave. Just remove the relay highlighted, in yellow, from the diagram above. This goes to the starter.
Lawyer Aidroos's user avatar
26 votes

How do cars drive through deep water as shown on many videos online?

Generally the car shouldn't be driven through water! On your Yaris, where you had high revs, what would happen if your air intake was submerged would be that your engine would fill some cylinder(s) ...
Markus's user avatar
  • 1,136
25 votes
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What does O/D mean on a dashboard & a button under the transmission button?

The "OD" means over drive. It's the last gear in your transmission. When the indicator shows as "off", it means the transmission won't go into that gear. Overdrive provides a mechanical advantage for ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
25 votes

How slow ( not zero) can a car engine run without hurting engine and saving on fuel

You are right in the thinking of using less gas and that's exactly what the purpose was to have the start/stop feature. The main goal of doing it (at least here in the States) is for zero fuel ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
25 votes
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Does a Car Keep Moving If Neither Accelerator, Nor Brake Is Pressed?

In short, find a better driving instructor and, if possible, learn to drive a car with manual transmission. The long (still simplified) answer: Does the accelerator control and ensure gas is flowing ...
fraxinus's user avatar
  • 2,082
24 votes
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What happens if I change the oil when the engine is cold?

The benefits of changing it hot are the that oil is less viscous, so it flows better, allowing more of the old oil to drain. It will also drain more quickly. I know when I do mine, I let the engine ...
cdunn's user avatar
  • 9,296
24 votes

Spark plug broke off in engine - can I drive the car?

That's a nice car - don't be a consumer and break it because you're too lazy to fix it properly. Sadly the "proper" fix is to tow it to your mechanic, who will take the head off and fish out the ...
Criggie's user avatar
  • 2,958
24 votes

If I am just replacing the car engine, do I need to replace the odometer as well?

I've never replaced an odometer when replacing an engine. What I will do, however, is make a note in the cars documentation that the engine was replaced at xxx,000 miles with a new/refurbished engine ...
PeteCon's user avatar
  • 8,712
23 votes

Do pistons keep moving when the car stops?

The answer to your question is both yes and no. Yes in majority of the conventional vehicles, the pistons keeps moving even when the vehicles is at a stop light. The idle RPM, which is usually ...
Vish_evo's user avatar
  • 576
22 votes

Maintenance tips to prolong engine lifespan for short trips

Adding something to fuel tank: Not necessarily, just purchase good quality gasoline. It already has all the additives needed to protect the engine. However, I understand that in Brazil, fuel may ...
juhist's user avatar
  • 14.6k

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