57 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 ...
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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 ...
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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. ...
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  • 2,581
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 ...
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  • 581
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) ...
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  • 1,136
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 ...
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  • 2,581
24 votes
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Why one should not leave fingerprints on bulbs and plugs?

Why is this a thing? For bulbs it is - spark plugs don't care. The problem with getting fingerprints on bulbs (specifically halogen-type bulbs) is actually the grease that gets left behind - the bulb ...
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  • 9,728
20 votes
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Impact wrench on spark plugs?

In a word: NO! Please do not use an impact wrench on these. You run the distinct chance of stripping out all of the threads in the head, which will cause a huge nightmare for you having to have ...
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18 votes

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

If this happened during a plug change If you have roadside assistance/towing, I would highly recommend getting it towed home, then purchase a cheap USB inspection camera or a inspection unit like this ...
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  • 291
12 votes

Where do spark plugs get their electricity?

From a device called a coil. The coil is basically a transformer which takes in the 12vdc voltage from the battery and upconverts it to around 40k vdc (depending on the ignition system). Here is a ...
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12 votes
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Help with spark plug stuck upside down in well

I have a telescopic magnet which is invaluable for this very scenario. It even has a light built into the end of the magnet. I bought it because I saw it in the tool shop and it's gotten me out of a ...
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12 votes

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

There are a lot of variables here, but key risks are: water shorting electrical systems water being sucked into air intake (or potentially into exhaust) cold water coming into contact with hot metal ...
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11 votes

Do I really have to pull the engine to remove broken spark plugs?

Sounds to me like the plug is still in the head as normal, just with the porcelain and electrode snapped on the top end (where the ignition line attaches). If that's the case, it should be really easy ...
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10 votes
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What can I do with an Inline Spark Tester?

First, think of the possible failure modes: Spark plug is clogged with carbon or has an isolation error - it conducts current, but doesn't generate sparks, because the current flows through the ...
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  • 6,997
10 votes
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What Could Cause Flash Over / Arcing to Reappear on New Plugs?

I think your problem is your plug wires. I think they are leaking along the boot and down to ground (earth). With this loss of energy, you'll also see the large carbon buildup on the business end, due ...
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10 votes
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Can I use a 15lbs torque wrench for 13lbs spark plug job

While it most likely will be OK, it is not worth the risk. If you do over torque the spark plugs and strip the threads you will regret it because it will be a big job to get it fixed. Most mechanics ...
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  • 20.7k
10 votes

Can I use a 15lbs torque wrench for 13lbs spark plug job

The lower and upper ranges of the torque wrenches are generally unreliable. With a bit of bad luck the deviation of the torque wrench is too large for the threads. I'd consider getting a smaller ...
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  • 7,828
10 votes

Do I change all four coils when I change one spark plug that is faulty

You shouldn't need to change the spark plug coils unless they are faulty, so the answer to your question is no, you don't need to replace the coils again. There probably wasn't a need to replace all ...
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  • 20.7k
9 votes

Two-stroke dirt bike piston running into spark plug

My best bet is that the spark plug is too long in the first place. I don't know what the stock spark plug should be for your bike, but the NGK you are showing may/may not be completely within spec and ...
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9 votes
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What is spark plug heat range

The spark plug heat range refers to how well the center electrode conducts heat to the head. A hot plug can't conduct the heat very well that is what makes them hot, they can't cool themselves. A ...
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  • 15.9k
9 votes
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Why are the spark plugs from the same 2 cylinders corroding faster than the others?

What you see could very well be burned coolant as well as oil. As the glycerin burns in the combustion process it can take on corrosive properties that degrade the electrodes. Typically with oil in ...
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  • 32.8k
9 votes

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

No question - running the engine will break it. If you're "unlucky", there's enough clearance between the piston and the valves to fit the spark plug. In that case you'll have the spark plug ...
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  • 1,509
9 votes

Spark plug working fine in free air, but hard miss in engine

The current follows the least resistance. On a spark plug the current jumps between the gap in the electrodes. When the plug is out of the cylinder the easiest path is between the electrodes. But when ...
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  • 2,652
8 votes

Need to know about spark plug

Really what you need to do is learn how to "read" a spark plug. We can tell you what spark plug to use for a stock engine, but once you start modifying the engine, all bets are off. I will ...
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8 votes
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Are Oil Puddles in Cylinder Head Normal?

If you are suggesting there was oil inside the head where the valves/cam(s) are located, this would be perfectly normal. If you are saying the oil puddles are outside of the valve/cam area, this isn't ...
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8 votes
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How much does spark plug gap affect fuel efficiency?

The generalized statements about the gaps being too small causing insufficient burn and too wide having a weak spark are spot on. As you widen the gap, you need to increase voltage to cover the gap. ...
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8 votes
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Firing a Coil on Plug

You would follow these simple steps. Remove plug from engine Place plug into coil wire Make sure threads of the sparkplug are grounded to a metal surface. Validate metal surface goes to ground by ...
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  • 32.8k
8 votes
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Can a altered curve of spark plug finger break the engine?

I am yet to see an engine this tight that the piston can hit the spark plug ground electrode even if it is bent straight. Even if they somehow meet, the damage will be minor and not worth the worries -...
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  • 1,882
7 votes
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High revs after changing spark plugs

You mention two issues: fast idle hard brakes Both of these point to a vacuum leak. Inspect the brake booster vacuum line; it might have been compromised during the spark plug swap.
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  • 39k
7 votes
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Do I Need to Ground the Spark Plug When Testing

Yes you should ground the spark plug. In your case the spark plug was close enough to the block to still jump the gap. If the plug was far enough away from metal nothing would have happened. On a ...
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