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Coil pack is working but electrods aren't firing the fuel I need to know the gap for the electrods

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1/8 inch at the tips 9/16 from the center of the nozzle to the top of the electrodes and 1/8 inch out in front of the nozzle..... I am assuming you are talking about an oil furnace.....

Posted on Mar 28, 2011


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I have a 98 4runner with 300000 miles. It's been running excellent but day before yesterday it started sputtering like a tractor when driving and idoling. Service engine light blinks when in overdrive, and...

First check the plugs. Pull the #6 plug and look at the electrode. If it's wet and/or dark (black) it's probably not firing correctly. What is the spark plug gap? Is the center electrode eroded (not flat on the end)? Swap in another plug and see if it makes any difference. How old are the plugs?

Second, check the wires. Did you replace the wire(s) when you changed the coil pack? They should be replaced periodically (I replace the wires on my '96 4Runner at about 100k miles). Check the wires with an ohmeter. Resistance should be around 16-17.5k ohms (depends on length).

FYI, each coil pack on your vehicle fires two spark plugs. The #6 spark plug is fired by the #3 cylinder coil pack, so if the coil pack were bad, most likely both the #3 and the #6 plugs would not fire.

Feb 14, 2015 | 1998 Toyota 4Runner

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Have master heater 200000 btu that has spark an fuel but will not fire can someone help me

If this is a fuel oil burner in a residential style forced air furnace, you probably have the electrode adjustment wrong. The generic measurements for the electrodes for an 80 degree hollow fuel flow atomized mist spray is 9/16" above the center of the nozzle, 1/8" gap, with a leading dimension of 1/8". Because the atomized mist leaves the nozzle at an 80 degree angle, electrodes protruding too far out will be drowned out by the fuel and not ignite. Electrodes not extending out far enough may cause a serious delayed ignition that will rock the structure, or not light at all because if the cad cell doesn't react to the UV rays of a flame, it locks out the ignition control.

When in doubt, its always back to basics first. If this is a torpedo style heater, it may or may not utilize the two electrodes for ignition as noted above and may just use a spark plug style ignition device, in which case the above dimensions are rendered useless.

Dec 06, 2014 | Heating & Cooling

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Have a 1st cylinder misfire in my 2002 jaguar s-type

Difficult to say here as with a lot of modern engines they have all these covers over the engine and this i think causes them to run too hot around the head area where the coil packs are and as they are only copper windings i think this build up of heat causes them to fail ,unlike my XJ6 where it has a external coil with a dist cap .Also make sure the plug gap is correct 25th as some of these high frequency coils are specified with a wider gap which means the coil is working overtime to jump the gap ,i like to use bosch plugs with the multiple 3 connection firing electrodes as they last a long time and can be re.gapped and yes i know some garages throw their hands up and say replace but i feel this is only for the profit margin on renewing all the time .If the plug gap becomes too wide then this is causing the coil to burn out ,pluga should be re-gapped every 10000miles or am i just a old time has been who was taught different on cars with rod brakes and side valve engines

Mar 08, 2012 | 1995 Jaguar XJ6

2 Answers

Saw will not run or start...set ignition module gap, disconnected kill switch wire because there was no spark...Put in new spark plug, got spark..Primed for gas and set choke as per instructions...Would...

Often the cause is a failed fuel pump diaphram. Rebuild the carb... kits about $20. The diaphram works from engine vacuum pulses. Also the little flap type check valves go bad... the ethanol in gas doesn't help this problem...

Sep 03, 2011 | Poulan P3314 14" Gas Chain Saw 2.0 Cuin...

1 Answer

Mower will not start, seems to be ignition problem, engine doesn't even try to fire. checked spark plug and gap, checked ignition switch wire and changed coil pack.

Remember, if all of the safety interlocks aren't "made", the ignition circuit will never "close".
The symptom will be not even trying to turn over.

Jun 27, 2011 | Garden

1 Answer

How do you change plugs and wires 1997 sebring

Spark Plugs A typical spark plug consists of a metal shell surrounding a ceramic insulator. A metal electrode extends downward through the center of the insulator and protrudes a small distance. Located at the end of the plug and attached to the side of the outer metal shell is the side electrode. The side electrode bends in at a 90( angle so that its tip is just past and parallel to the tip of the center electrode. The distance between these two electrodes (measured in thousandths of an inch or hundredths of a millimeter) is called the spark plug gap. The spark plug does not produce a spark but instead provides a gap across which the current can arc. The coil produces anywhere from 20,000 to 50,000 volts (depending on the type and application) which travels through the wires to the spark plugs. The current passes along the center electrode and jumps the gap to the side electrode, and in doing so, ignites the air/fuel mixture in the combustion chamber. Fig. 3: Cross-section of a spark plug tccs1045.gif
Use a Spark Plug socket and 12" extension with a ratchet. Pull the boot of the spark plug wire off with a spark plug wire boot puller available from your local parts or tool store. Unscrew each spark plug and replace the wire by pulling the boots off both ends, one at the spark plug end and the other at the coil pack or distributor cap. Do only one cylinder at a time to avoid confusion. Put the appropriate length spark plug wire from the package on to the coil pack or distributor at one end and screw the new spark plug in and attach the other end of the spark plug wire to the spark plug. If you do it one cylinder at a time, it should be easy. Good luck on this repair.

Oct 07, 2010 | 1997 Chrysler Sebring

2 Answers

Cylinder 6 misfire

could be a couple of things. 1) bad plug or spark gap. check plug for burning on electrode. check gap. if you replace 1 then replace them all. 2) check wires for any white lines. mainly around the boots, but check it all. the white lines are tell tale signs of arcing. replace if needed. 3) chech distributor cap & rotor for arcing. if you have a coil pack it could be whatever pack is controlling #6

Aug 28, 2010 | 1998 Ford Ranger SuperCab

2 Answers

I just replaced the spark plugs and wires used platinum plugs instead of the iridium that were the oem and now its sputtering during acceleration of course this didnt happen right away so im not sure if...

The difference in plugs would not make it misfire . Is the check engine light on ? Most times when it is fuel system related it will not throw a code . I have installed new plugs that have been dropped and misfired but this is something that you will have to diagnose if it's one cylinder or multiple misfires. Please let me know if i can be of any help.

Aug 05, 2010 | 2003 Chevrolet Monte Carlo

1 Answer

#2 missing changed out plug wire is firing. is it the coil pack

I would check the spark plug condition and electrode gap.

Apr 05, 2010 | 1997 Ford F150 Regular Cab

1 Answer


HI. There are several areas of concern here. I will list them below. Check all areas stated in the list for faults.

Possible cuases:

1. Incorrect firing order set. On the 2.0, 2.4 and 2.7 engines. These engines are equipped with a distributor-less ignition system. This system incorporates a coil pack assembly, along with wire sets. In order for the assembly to fire correctly, the order of the wires must be set to the proper sequence. if not, the engine will not turn over, or start correctly. Make sure your firing order is correct, and make sure you have not placed a particular wire set into the wrong cylinder. I will post a picture of the correct firing order for your engine, below this list, shortly.

2. Incorrect spark plug gapping procedure. If the new spark plugs were gapped incorrectly, this will not allow for proper spark, thus, preventing optimal combustion, due to lack of fire. Check the spark plug gap using a wire gap gauge, and adjust if necessary. The gap should be 0.039-0.043 in. (1.0-1.1mm)

3. Failed coil pack assembly. This will be the worst case scenario. The coil pack supplies the necessary current that fuels each plug. The current is transferred, via wire sets.This will be the culprit if all the above areas are proven to be operational, and in good shape.

4. Failed wire sets. Replace the wire sets if faults are found at the connector at the ignition coil pack, or at the plug boot.

In order to provide the correct firing order for your engine, i will need the engine size and liter information, if possible. Please post this information, asap. Thanks..

Mar 24, 2010 | 2004 Kia Optima

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