Question about 1991 Honda Accord

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Spark plugs i changed my spark plugs recently and when i check it today, it was coated with carbon deposits. i know it's not normal. could you help me with this? my car has a carburetor.

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  • Ed Woods
    Ed Woods May 11, 2010

    You are more than likely geting a little to much fuel. What kinda of car is it and if you know what is carb type?

  • Ed Woods
    Ed Woods May 11, 2010

    to much fuel

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  • 52 Answers

Try adjusting the carburetor.

Posted on Aug 19, 2008

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CHANGING SPARK PLUGS ON A 2002 LINCOLN LS


Generally in a spark plug is 60000 kilometers, if fuel is bad need in early, remove the spark plug, such as for auburn or rust color, spark plug showed normal; Such as stained with oil, shows that the spark plug gap imbalance or too much oil, high tension line short circuit or open circuit; Such as black smoke, spark plug type cold wrong or mixture is thick, the oil is up; Such as the top between the electrode and sediment, when for the oily sediment, shows that the cylinder into the oil has nothing to do with the spark plug, when the black sediment, spark plug carbon deposition and bypass, when grey sediments, is a gasoline additive covered electrode lead to lack of fire; If serious erosion, such as the scar at the top, with black pattern, electrode melt, showed that the spark plug is damaged.
hope help you -auto diagnostic tool

Apr 02, 2013 | 2002 Lincoln LS

Tip

Engine Diagnosis Old Spark Plug Condition


Old spark plugs removed from your engine can tell a lot about the condition of the engine. Experienced mechanics can use this information to help diagnose several conditions simply by examining the state of the old plugs.

This tip is written as a useful guide to help diagnose engine problems and give a general indicator of the state of your engine. If you have ever wondered what you can tell from the condition of your old spark plugs please see the illustrations below.

As an example note that conditions such as over advanced ignition timing, lean fuel mixture or intake manifold leaks can often be determined from a plug that shows absence of deposits and a burnt or eroded electrode. However, sometimes this condition is caused by incorrect spark plugs having been fitted at some stage and in this case can be easily rectified by replacing the spark plugs with plugs that are in the correct heat range.

More serious conditions can be determined from oily deposits which indicate that oil is leaking past the valves guides or piston rings. In this case the mechanical fault will need to be rectified which will involve an engine strip down. These symptoms when seen on old spark plugs are a very significant diagnostic pointer as to how the engine has been performing up to this point and can help identify faults in the engine itself

The first picture in the illustration is of a healthy spark plug. Please follow through each of the images and you can compare your old spark plug against each of the images for a description of the engine problems that are associated with it.

Thanks for viewing my Tip.



Normal: Here we see a normal used plug which should be a brown to greyish color with only slight electrode wear. This plug has been operating correctly and is the in correct heat range for the vehicle.
3850b9d.jpg



Worn: On this plug you can see a rounded electrode. The normal colour deposits are seen but this plug has simply been in the vehicle too long.
f0d90a4.jpg



Plug Run Too Hot. The symptoms here are a blistered white insulator with an eroded electrode and an absence of deposits.
Causes: Incorrect heat range plug used, over advanced ignition timing, lean fuel mixture, intake manifold vaccuum leak, sticking valves or insufficient engine cooling.
417cde3.jpg



Carbon Deposits: Dry sooty deposits like this indicate either a rich fuel mixture or a weak ignition. This is a good indicator of a clogged air filter or a problem in the fuel or engine management system. Also check for ignition problems.
e1aa79d.jpg



Preignition: Here we see melted electrodes. You will note the insulator is white. This is an indication of severe misfiring and overheating. Can be an indicator of severe engine damage. Causes: Check for over advanced ignition timing, lean fuel mixture, insufficient engine cooling and lack of lubrication in the engine. Also check correct heat range plug has been used.
a83b8c6.jpg



Ash Deposits: Encrusting of light brown deposits observed on the electrodes. Causes: Oil or fuel additives - try changing the gas brand that you are using. Severe cases often indicate engine valve seal problems whereby oil is seeping into the combustion chambers.
94c22b6.jpg



High Speed Glazing: Insulator looks glazed and yellow. Condition is associated with sudden temperature rises from hard accelleration of the engine. Plugs in this condition can cause misfires at high speeds. These plugs will need to be changed and consider replacement with a colder temperature range plug.
17d5093.jpg




Oil Deposits: Indicative of oil leaking past the valve guides or piston rings and fouling the plug. Vehicle will run badly. Engine will need stripdown and repair.
2550cb7.jpg




Detonation: Insulator appears cracked or chipped. May have resulted from poor gapping technique which has damaged insulator. Can lead to piston damage. Replace plugs and ensure fuel anti knock values are correct. Ensure plugs are carefully and correctly gapped.
e2dc4d9.jpg




Gap Bridging: In this case deposits can clearly be seen lodged between the electrodes. The plug will not fire and this results in a dead cylinder. Clean or replace the plug.
ab865a7.jpg

on Dec 12, 2009 | Toyota Corolla Cars & Trucks

1 Answer

96 nissan sentra cylinder 1 misfire


DETERMIN IF YOUR PROBLEM IS ONE OF THE FOLLOWING BEFORE CHANGING ANYTHING .1.ELECTRICAL
2.FUEL RELATED OR 3. MECHANICAL.

PERORM A COMPRESSION CHECK TO ENSURE THE COMPRESSION IS GOOD .IF THE COMPRESSION IS IN ALL CYLINDERS PROCEED TO CHECK FUEL SYSTEM .REMOVE THE FUEL INJECTORS AND EXAMIN THE INJECTOR TIP FOR CARBON DEPSITS .CHECH FUEL SPRAY PATTERN ,ENSURE INJECTORS ARE ACTUALLY SPRAYING . THEN PROCEED TO EXAMIN THA SPARK PLUGS .LOOK FOR DISCOLOURATION OF SPARK PLUG ELECTRODES OR CARBON DEPOSITS. IN DIAGNOSING PROBLEMS ONE HAS TO SYSTEMATIC OR ELSE YOU WOULD BE WASTING MONEY AND TIME PURCHASING AND REPLACING COMPONENTS WHICH ARE NOT DEFECTIVE . GOOD LUCK .

Nov 26, 2012 | 1996 Nissan Sentra

1 Answer

My 95 camry is stalling out.


This usually caused by a sticking idle air control valve, it's attached to the throttle body, to fix this remove the throttle body and then the valve and clean both of them using a can of air intake cleaner and a brush, clean all the carbon deposits and make sure the IAC valve does not hang upbefore reassembly.

Nov 16, 2011 | 1995 Toyota Camry

1 Answer

Engine diagnosis and causes for spark plugs carbon deposits


common causes of carbon deposit in spark plug:

1. blown head gasket.
2. faulty piston ring.
3. cracks/leaks in the cylinder head. this is quite serious.

possible solutions for number 3 are:
1. resurfacing of cylinder head
2. reboring of combustion chamber
3. resleeving/replacing of pistons.

Aug 12, 2011 | Nissan Sentra Cars & Trucks

1 Answer

Car doesnt idle normal after engine gets warm


could be dirty or defective spark plugs! remove spark plugs (engine cold) and try cleaning using a motor cleaner and remove those carbon deposits at the tip. also examine tips for corrosion. if the tips are worn out, time to replace those plugs. the manual recommends to replace spark plugs every 10,000 kilometers.

May 05, 2011 | Toyota Corolla Cars & Trucks

1 Answer

When do the spark plugs need changed


Spark plugs like any electrical device become worn over time. Spark plugs also work under extreme condition. The use of cheap fuels will leave deposits, poor maintenance, bad air filters, old plug wires, all these items can cause a spark plug to fail or not perform at its peak level. Also spark plugs use a gap or Electrical bridge that is used for high voltage to arc across. The larger the gap the hotter the spark until you reach a point that the coil can not bridge the gap and then you get a misfire. Also when a plug gets deposits from either oil, poor fuel, carbon this will shorten the gap and cause a weaker spark resulting in poor performance, wasted fuel and engine dieseling or Run on after the ignition is turned off.
These are the simple reasons for spark plug replacement.

Jul 19, 2010 | 2005 Dodge Caravan

1 Answer

Cranks over slowly but doesn t seem to want to run on all cylinders


First remove and inspect the spark plugs If one is coated with black carbon replace it and if the car has not had a tune up in recent memeory replace the distributor cap if equipped and all spark plugs. If this car has individual coils only replace the corresponding coil with bad plug after replacing the spark plug wires and plugs, and only isf the problem persists it may be a bad coil for that cylinder or spark plug.

Dec 15, 2009 | 1994 Ford Escort

2 Answers

2.8 multiport 1989 camaro


Hi, this is normally a fuel transfer issue. i recommend changing the fuel filter and fuel pump if not done already. I also would change the air filter as well.this will help with the air and fuel flow.

If possible, it would help even more if you would change the spark plugs and wires as well.

To top it off, Add a fuel system cleanser. Techtron makes some of the best fuel additives on the market. This type of fuel system cleaner will scrub the fule lines and intake as well, in return, cleaning out all carbon deposits that may be causing spuddering and obstructions.

May 29, 2009 | 1989 Chevrolet Camaro

2 Answers

Spark plugs change


remove the spark plug lead from the plug, blow out any dirt etc from around the plug, undo the plug and remove from the vehicle, make sure the plug has the right gap setting before installing into the engine.
Check each plug that you remove for any sign of a wet or oily plug which are signs of more serious problems.
If all the plugs are dry with just a light brown carbon deposit on them they are firing ok.
Hope this helps

May 22, 2009 | 2006 Suzuki Forenza

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