spark plugs are used to ignite the fuel-air mixture in a petrol/gasoline engine.

learn more… | top users | synonyms

21
votes
8answers
196k views

What is the difference between normal, platinum, iridium plugs?

What is the difference (besides price) between normal, platinum, and iridium spark plugs?
17
votes
11answers
140k views

What happens if a single spark plug unexpectedly goes down in a multi-cylinder engine?

AFAIK vehicle manuals say owner must replace spark plugs every N miles. Suppose he fails to do so and a single spark plug unexpectedly dies in an engine with multiple cylinders right in a freeway. ...
17
votes
1answer
4k views

How do I know when to change my spark plug

I ride a Piaggio scooter with a single cylinder engine. Recently I broke down and the engine wouldn't restart. It turned out the spark plug was stuffed. How can I ensure that doesn't happen again?
12
votes
1answer
8k views

How much does spark plug gap affect fuel efficiency?

I've read conflicting reports regarding how plug gap can affect fuel efficiency. For example, I've read that too small a gap won't cause a clean burn, or that too large a gap can cause misfires due ...
11
votes
5answers
2k views

How to properly change out spark plugs?

I am looking into how to change out my spark plugs on my 4 cylinder 2005 Mazda 3. All I know to do is: 1: Open each cylinder. 2: Use a spark plug socket (with the rubber insert) to remove the old ...
11
votes
2answers
2k views

Is there a measurable benefit to replacing spark plug wires?

My 92 Civic has very old spark plug wires, probably original, but their resistance is in-spec (under 20k ohms), they have no external damage, and the vehicle has no misfire or other symptoms ...
8
votes
2answers
5k views

2000 Honda Civic Won't Start after Replacing spark Plugs

My 2000 honda civic ex 4-dr sedan seemed like it was misfiring. I decided to check the spark plugs to see if that was the issue. I replaced the spark plugs. The car would turn over however the ...
8
votes
1answer
1k views

What do i need to know when replacing a valve cover gasket

I have an oil leak from a cracked valve cover gasket that i want to replace myself. I bought the gasket nearly 6 months ago and i am apprehensive at doing it myself without sort of feed back as to ...
7
votes
1answer
158 views

What can I do with an Inline Spark Tester?

Due to my recent problem with weakly firing plugs, I'm looking at inline spark testers. I've seen three basic types: The simple flashing one which goes in between the wire and plug with the plug in ...
7
votes
1answer
2k views

What does a healthy spark plug look like?

The spark plug pictured here: Has some black carbon on the underside of the ground electrode and has black carbon on the "base" area below the centre electrode (not pictured). Is this normal and ...
6
votes
1answer
418 views

Two-stroke dirt bike piston running into spark plug

Recently, I submitted a post on here regarding a broken ground electrode on the spark plug of my 2005 Suzuki RM125: Bottom piece of spark plug broke off in motorcycle engine Well, I found out what ...
6
votes
1answer
68 views

Socket wrench turns loose on top of spark plug

I'm trying to replace the spark plugs of my 2006 Prius, but the deep well 5/8 socket attached to a 2 in extender just turns loose, as if it does not fit in the top of the spark plug. I tried also 3/4 ...
6
votes
2answers
893 views

Estimate for head removal / reinstall

In changing the spark plugs in my 2000 Ford Mustang GT (4.6L), I sheared one of them (number 3) The ceramic is totally removed, as is the hex nut. The threaded portion as well as the ground electrode ...
6
votes
2answers
3k views

Really high idle after tightening spark plugs

I had a very nasty tick in my engine after doing a bunch of work to it, I just redid my chain tensioner which went a long way to fixing it, then I found that spark plugs could cause a tick, so I ...
5
votes
2answers
730 views

How can I adjust gaps to spark plugs?

Have a couple spark plugs that needs adjusting. Whats the best practise for this? Is this valid? http://motorqa.com/question/8/whats-the-best-way-to-adjust-gap-in-spark-plugs
5
votes
2answers
329 views

Will Driving 100 Miles With a Misfire Damage My Car?

Background: I have a 2002 Dodge Dakota Quad Cab slt with 4.7L Magnum V8. My check engine light came on when I was at work. I then drove 20 miles home to my house, pulled out my scan tool and ...
5
votes
1answer
302 views

Honda CBR 250 won't start after heavy rains, puttering noise

There has been heavy rain and yesterday I couldn't start my bike. The main and other fuses are not blown. I ride it regularly. Turning the bike on: https://vid.me/pYNw. The high-pitch noise is not ...
5
votes
1answer
48 views

High revs after changing spark plugs

I have an '07 Chrysler Town & Country. Check Engine Light came on 2 weeks ago, ran the diagnostics : Misfire in cylinder 3. So we changed the spark plug in that cylinder to see if that was the ...
5
votes
2answers
3k views

Spark plug gaps - manufacturer or shop manual?

So I have a 2000 Ford Ranger XLT 4.0L V6 OHV Engine and I recently replaced the spark plugs. The thing is, the original recommended spark plugs have a gap of 0.52-0.56, which is what is recommended in ...
5
votes
2answers
73 views

RPM drop when coming to a stop in neutral, Civic 06

Let's say I'm getting off the freeway, I press the clutch, shift out of 5th to neutral. At that moment my Civic DX would usually drop to about 1000 rpm at idle. For the past month it drops too low, ...
5
votes
1answer
555 views

No spark on my new motorcycle

I recently purchased an 81 Suzuki GS450L, my very first bike. I'm not getting a spark. When it dies, it does so silently. No backfire, sputtering, etc. My first thought was that it had aftermarket ...
4
votes
4answers
31k views

What is the proper way to extract a broken sparkplug?

When dealing with a car with aluminum head(s), what is the proper way to extract a broken sparkplug?
4
votes
3answers
5k views

Are Oil Puddles in Cylinder Head Normal?

Changing spark plugs and one well was full of oil. I took off the valve cover to replace the gasket and noticed that there was quite a bit of oil puddled in the cylinder head. Is this normal or could ...
4
votes
1answer
10k views

Getting a stuck spark plug out

4 spark plugs--three finally changed but one won't come out and is apparently stuck with a deposit of carbon. Has a service every year so not as though it is ignored. we don't want to change the car ...
4
votes
1answer
479 views

When I remove a spark plug is it bad news if dirt or grime falls into the engine

Despite my best effort to clean up a corroded spark plug and blowing the area with an airline before removing would it be bad news if dirt or grime falls into the engine in the process of removing it? ...
4
votes
1answer
62 views

Gapping New Spark Plugs from the Dealership

In general, if I buy plugs from a dealership which looks up which plugs I need based on my cars VIN or license number, do I need to worry about checking the plugs gap, or can I just assume they will ...
4
votes
2answers
1k views

Spark Plugs 1998 Buick Lesabre

Where are the spark plugs in a 1998 Buick Lesabre? Pictures would be helpful as I'm a novice at this type of thing. I'm assuming I need all six because I'm getting a check engine light saying number 6 ...
4
votes
1answer
14 views

Vespa Plug,Contact Point and Condenser

For my Vespa P150 x I want to know technically regarding to Plug What should be the color of a healthy plug spark? Mine is a blue red like color. Contact Points How can I check that the points of ...
4
votes
1answer
23 views

2000 Buick Century not running after spark plug change

I had someone come look at my car (big mistake I should have done I it myself). He said the spark plugs needed to be changed and while he was changing them he was revving the engine. He didn't put the ...
4
votes
1answer
46 views

How to check if bad spark plug threads are causing compression loss

How do you check if your spark plug threads are bad? I would like to know the most non-invasive method of checking this and also the most cheapest way to check this.
4
votes
2answers
7k views

Oil leaking from spark plug socket

I have oil leaking from a spark plug socket on my 1981 Volkswagen Rabbit pickup truck. Before you ask, it's swapped with the 1.6 gas motor instead of the 1.6 diesel. The oil leak appears to only be ...
4
votes
4answers
1k views

How to remove a stripped/broken sparkplug on a 2001 Chevy Malibu

I have tried to remove the #3 spark plug from my 2001 Malibu, with no results. It is very hard to get to that particular spark plug because there is not much room between the fire wall and cylinder. I ...
4
votes
2answers
1k views

Misfire in cylinder 4

About 8 months ago my engine light came on, and after pulling the code it was a misfire in cylinder 4. My vehicle is a 2004 Mazda MPV, and only has 60K miles on it. Everyone I talked to was skeptical ...
4
votes
0answers
44 views

Ford Expedition ignition cable problem

Is this the underlying problem or a symptom of something else?? I have a 99 Ford Expedition that has a knocking and pinging problem. Two different mechanics have narrowed it down to the ignition ...
4
votes
2answers
1k views

Saab 9-3 stuttering and cutting out [closed]

I've got a 1999 Saab 9-3 2.0l Automatic (not the turbo). It's been running fine, then a bit more than a month ago it started to stutter when accelerating or decelerating. Only occasionally, but it ...
3
votes
3answers
98 views

Can I run on 7 cylinders if I shut the injector to that cylinder off?

I have a 2006 F150 5.4 Triton 3 valve. I've had a really bad issue, where a socket is stuck in my spark plug chamber and everything has failed to get it out. The option I'm left with now is ...
3
votes
3answers
2k views

Normal oil and fuel consumption for MkIV Golf 1.4l?

Vehicle: 2002 VW Golf (German) Engine: 1.4 liter, gasoline 75 hp Odometer: 60k miles / 100k km Fuel consumption: 29-33 MPG / 7-8 liters/100km Oil used: 5W30 ...
3
votes
1answer
680 views

O2 Sensor Error after replacing spark plugs?

Ford Taurus 2004 Sedan SES DOHC. (The car is actually in the shop right now and I told him to hold off until I get more info.) Took the car to the local shop to get the spark plugs replaced. Because ...
3
votes
1answer
45 views

Should I change one spark plug and wire or all of them?

2 days ago I felt that something isn't right with my Ford. A mechanic told me that he wants to replace all four spark plugs and wires but could I just change the one? I'm scared that he's ripping me ...
3
votes
1answer
129 views

MX5 lost power after spark plug change

I own a Mazda MX5 mk2 1.6L. I had severe problems with engine misfiring, caused by the valve cover seal, to leak. The oil that was leaking was concentrated near the spark plugs, and periodically it ...
3
votes
1answer
4k views

How to diagnose a bad spark plug?

What I always did up to now to check if my spark plug was doing fire : Remove it. Keep it plugged into the spark plug cable. Ground it on the frame. Start and check if sparks happen. If they are ...
3
votes
1answer
184 views

Engine Turns Over Gets to 500rpm, Shakes, Then Loses Power After Spark Plug & Wire Change

I drive a 1994 TOYT Camry LE 2.2L Coupe. A couple days ago while I was driving, I stopped at a stop light and my engine block started shaking the whole care at low speeds and idle. I replaced the ...
3
votes
1answer
359 views

Bottom piece of spark plug broke off in motorcycle engine

I was riding my 2005 RM125 dirt bike the other day when it bogged down all of a sudden. I noticed the spark plug had backed out of the head, thus causing the stall. I pulled the spark plug all the way ...
3
votes
1answer
2k views

What spark plug gap to use for old 5HP briggs and stratton

I am doing some maintenance on a ~25 year old garden tiller with what I believe to be a 5.0 HP Briggs & Stratton motor. I have no manuals for this thing. Cars I have worked on have had spark ...
3
votes
2answers
325 views

How to Clean Lightly Fouled Spark Plugs

My car was running without a thermostat for a few months after I put in new spark plugs. The plugs are a bit fouled ( not horribly so ) and I was thinking about cleaning them. I've seen suggestions ...
3
votes
1answer
34 views

Gap a spark plug for another motor. How to be sure the correct gap for another model year motor?

I have a 1993 C1500 with 4.3L that has a motor (also a 4.3L) from another truck installed. The truck is originally a 1993, but I'm not exactly sure what year the "new" motor is - it was pulled from a ...
3
votes
1answer
346 views

How often should spark plug wires be replaced?

I last replaced them with the plugs about 4 years/60-70k miles ago. I bought platinum plugs I if I remember correctly, so I still got some life on those. The car (2001 Buick Regal) is still in good ...
3
votes
4answers
6k views

Spark plug tips are breaking/melting or falling of my Bosch Platinum Plugs

After 150,000 on the original factory plugs I replaced them all with Bosch Platinum, single tip, plugs. After a couple of months my car began to idle roughly at stops but not always. Then one day it ...
3
votes
1answer
2k views

What is the difference between normal, platinum, iridium plugs in petrol/LPG vehicle?

This question was related with this What is the difference between normal, platinum, iridium plugs? Is there any difference if petrol vehicle is converted to liquid propane gas (LPG)? In my case I ...
3
votes
1answer
117 views

Carbon Fouled Plugs '74 TX500

I'm somewhat new to wrenching my bikes and I'm loving it! :D I have a 74 Yamaha TX 500 that keeps carbon fouling her plugs :(. I've put on slightly hotter plugs (D7EA from D8EA), narrowed the jets ...