13 votes
Accepted

Car only runs when I am cranking the car

That is usually a ballast resistor fault. Some cars had a resistor mounted next to the ccoil which provided about 9v to the coil when running. When starting the coil was supplied with 12v to increase ...
Solar Mike's user avatar
  • 34.6k
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 ...
Jupiter's user avatar
  • 3,222
7 votes
Accepted

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 ...
vini_i's user avatar
  • 16k
6 votes
Accepted

any downsides to early spark plug changes?

No. Other than the hole in your pocketbook. On a separate note, though ... if you are going out of your way to purchase all of those spark plugs, you'd be better off just getting the platinum or ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
5 votes
Accepted

Fourth piston isn't sparking so car is losing power

I am pretty sure the spark plug is broken but I am not sure That's almost certainly the issue. Replace the spark plug and try again, if the problem is fixed, you're all set. If not, then there are ...
jwh20's user avatar
  • 12.1k
5 votes
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WOT uphill, no increase in RPM, consuming more gas?

I would bet the engine in your car is drive-by-wire, which means the computer is controlling the throttle, not you. In doing so, it is going to look at the load put on the engine and a bunch of other ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
5 votes
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Small spark can be seen after replacing spark plugs

Visible sparks are not ok. I'm not familiar with your particular plug wires, but that normally means the insulation or wire connector is damaged. If you see a spark, at a minimum it means that you'...
JPhi1618's user avatar
  • 13.2k
5 votes

When does the spark plug ignite the air fuel mixture?

The power stroke (the bang in the series: Suck; Squeeze; Bang; Blow) begins after top dead center (TDC) past the compression (Squeeze) stroke. The spark does ignite the air/fuel mixture prior to the ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
4 votes

Is there a risk of igniting the incoming charge with wasted spark systems?

If the inlet valve opens 20 deg before TDC, will fresh mixture be going in or not? As there is still pressure in the cylinder - the exhaust leaving is helping to "draw" the fresh mixture into the ...
Solar Mike's user avatar
  • 34.6k
4 votes

Car won't start

It sounds like you're lacking compression - I think the sound you're trying to describe is the engine turning much faster than it should be, which would be hte case if there was no resistance. Have ...
Nick C's user avatar
  • 28.7k
4 votes

any downsides to early spark plug changes?

You dont need to change them that often as 5k that would just be useless. what @ᴘᴀᴜʟsᴛᴇʀ2 said about the aluminum heads is perfectly right. Change them along with your timing chain or water pump. ...
kasey's user avatar
  • 1,090
4 votes

Weird object in cylinder head preventing spark plug install

It appears the threaded portion of the body has broken away from the body itself. The split would have occurred at the point where the image below points to as "spark plug gasket". This could have ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
4 votes
Accepted

Is it possible to have a good looking spark but but still not suitable for ignition?

Inside the cylinder is quite a hostile environment. What looks like a strong looking spark at atmospheric pressure outside of the cylinder can become nothing at high pressures in a fuel rich ...
HandyHowie's user avatar
  • 25.2k
3 votes
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spark plug problem in service

Usually, reputable garages would in these kinds of circumstances pay for the accident. However, reputable garages have a higher labor rate than non-reputable garages, so you get what you pay for. I ...
juhist's user avatar
  • 14.5k
3 votes

Is there a risk of igniting the incoming charge with wasted spark systems?

The wasted spark will likely be 30 degrees or so before TDC. There would be no fresh fuel charge at this point.
TomO's user avatar
  • 294
2 votes

how much coolant required in chevrolet spark

According to this website, the coolant capacity for the 2007 Chevrolet Spark is 4.2L (4.4 qts) for the 1.0L engine. If your vehicle differs from this, you can cross reference on that page to get your ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
2 votes

Spark Plug Gap Ranges

Nobody gaps plugs anymore, unless they are doing something custom for a racing vehicle or similar. I certainly wouldn't risk damaging an electrode on an NGK Iridium at 10-15 bucks each. The correct ...
SteveRacer's user avatar
  • 12.4k
2 votes

Overfilled oil by 1 quart in a Chevy Spark

For peace of mind, go to a good workshop and they will have a tube that can be put down the dipstick hole which will then remove the excess (it sucks the oil out). That amount may or may not be a ...
Solar Mike's user avatar
  • 34.6k
2 votes

Spark Plug Deposits

Depending on the mileage on these plugs, I'd suggest there's absolutely nothing wrong with the way your engine is running. These plugs look to be in great shape. The small amount of deposits on the ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
2 votes

What components on a 1973 Datsun 240z would cause loss of spark

There are two possibilities, assuming of course that all the correct parts are fitted; compare dimensions and part numbers to anything removed from the car. Either, the distributor isn't turning or ...
Steve Matthews's user avatar
2 votes

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

Air is an insulator until you exceed the breakdown voltage, then it starts conducting and you get a spark. If an insulator inside the plug breaks down at a lower voltage than at the spark gap, then it ...
Rodney's user avatar
  • 121
2 votes

2017 Chevy Spark Drive Cycle Help

Your evap readiness monitor may not set if your fuel tank is more than 3/4 full. You haven't stated your location, but in some jurisdictions such as California, you can pass if all monitors have run ...
MTA's user avatar
  • 6,155
2 votes

When does the spark plug ignite the air fuel mixture?

That's a great question! Four cycle engines have four steps to operate(cycles): Intake(Suck) Compression(Squeeze) Ignition-Power(Bang) Exhaust(Blow) As seen here Technically, the spark ignites the ...
Geary's user avatar
  • 49
1 vote
Accepted

What are the pros and cons of using distributor per bank vs single bigger distributor on a dohc v8 for example?

Well the play in both causes the timing to drift between the two banks when there are two distributors. A single distributor with either one or two sets of points is easier to time - especially if you ...
Solar Mike's user avatar
  • 34.6k
1 vote

Coolant and How much

It has 5 US quarts coolant. You can check HERE as a reference
Cubic273.15's user avatar
1 vote

Missing spark plug, broken rear timing chain guide?

It's clearly an issue on their side. A spark plug does not blow out of the engine alone, the spark plug would be shattered at minimum. Get the best refund you can, reinstall the spark plug and try a ...
Pierre P.'s user avatar
  • 309
1 vote

Normal spark plug vs platinum

There should be no ill effect of using the platinum spark plug over a "normal" spark plug (usually a copper based plug). The main difference between the two is the tips of the platinum plug will last ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
1 vote

Does starting the engine with one of the spark plug wire disconnected damage the starter coil?

No. The reason your other friend incorrectly said that is because if a charged plug was touching a ground (the frame or whatever) that's a short over a device designed to produce a high voltage, ...
Jason Arthur Taylor's user avatar
1 vote

Understanding the waveform for my waste spark system

OK, so I was reading this article from Motor magazine and those are apparently both normal sparks, and in a waste spark system, the waste spark is superimposed on the firing spark and can be seen as ...
Robert S. Barnes's user avatar
1 vote

Do leaking shocks need to be changed?

I saw a really minor oil leak in the shock of my new 2011 Toyota Yaris shortly after purchase. The shock worked perfectly, and nobody in annual inspections complained about a broken shock. I also didn'...
juhist's user avatar
  • 14.5k

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