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Erratic spark from coil

While trying to start the engine will not fire consistenly

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Check for a bad or corroded ground.

Posted on Aug 22, 2014


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When i turn on my 04 taurus. It starts makin knock sound , i replaced my lower intake n i think i missplaced the spark plug wiring

If the spark plug wiring is not correct, the engine will misfire and that will create erratic combustion, which is a shock to the cylinder, which results in a load harsh noise. Locate the number 1 spark plug wire on the distributor cap and trace each wire to the spark plugs. The firing order will be listed on the intake manifold. Make the correct wire to spark plugs attachments as needed.

Oct 11, 2016 | 2004 Ford Taurus

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It mayI have no fire going to the coil or from the coil to the plugs

Have you checked the wiring, the spark @ plug, Power to the coil???

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getting fire from coil but not to plugs - CarGurus > Questions > Dodge > Ram 1500

CarGurusJun 12, 2013 - 2000 dodge ram 1500 4x4 not getting fire changed distributor cap, coil, pickup ignition, rotor, plugs, plug wires 2 answers. ... 1994 dodge 5.9 just shut off and wont start back up there is no spark or fire from coil or plugs. ... 94 dodge van 318 eng will not start new plugs new crank ...

Ignition Coil Troubleshooting: (No) Fire in the Hole

Jan 27, 2016 | Cars & Trucks

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What is a control module?

cars have many , control modules, most are microcomputer based.
the PCM on the Forenza runs the engine, EFI
spark and fuel and transmission shifting.
can be lots of things,
lost spark
check all fuse first, that means test them if they look good.
second, is use a scan tool to see why it dont start..(spark dead? and why)
there is no distributor on a 06. !
but there are 4 engines, used, not posting which engine, makes help near impossible.
most cars, 06, suzuki, usa , have a single coil pack
it has 4 coils inside ,one for each cylinder.
so are all 4 coils dead? is that it?
spark leaves the coil pack it never has sparking going it to it.
the coil if fired from the PCM
the PCM fires the coil with and ignitor.
the PCM fires the igniter if the CMP and CKP sensors work.

see coil pack below?
if all 4 are dead, we scan it after fuse checks. always....


Apr 10, 2015 | 2006 Suzuki Forenza

1 Answer

Husqvarna Problems

When it won't start have you removed the spark plug after cranking it over like you were attempting to start it cold with the choke on and then inspecting the spark if it's wet then you know it is in fact getting fuel enough to start and you can proceed with the next test which is putting the spark plug back on the plug wire and grounding the spark plugs base against the motor so it can ground and crank the motor over like you again were trying to start it and seeing if your getting a good blue colored spark that is blinking fast and doesn't stop blinking/arching at the plugs electrode. ( shut the choke and throttle positions off and when you ground the spark plug do so away from the plug hole) This test is easier if you have someone turn the key for you so you can watch what the spark plug is doing while cranking it over for about 5 to 10 seconds. If erratic or no spark and assuming you've changed the spark plug or plugs then something is grounding the shut off side of the coil or coils or you have a coil problem.

Nov 20, 2013 | Husqvarna Zero Turn Mower Z5426

1 Answer

My 1991 ford mustang has fire at the coil and the distributor but it will not start

You said,"My 1991 ford mustang has fire at the coil and the distributor but it will not start".
But, you did not mention what size Engine your mustang has nor the method you used to Check [said 'fire']
If the spark gets that far (to the distibutor) it is of no matter-IF it doesnt continue on from there then, OF COURSE it won't start. You started off on the right track, now all you need to do is Keep on going! What we need to find out is:
Is the 'fire' getting to the sparkplugs?
If not, then you will NOT HAVE combustion which is absolutely Necessary to 'fire off'/start your engine.
Also, you didnt mention what the 'fire' (i.e. spark) looks like. What color is the spark is it yellow-orange or cold hot blue white? Is it Well defined or sloppy and wide? Is it constant or is it erratic?

If you need further help, reach me via phone at

Sep 23, 2013 | Ford Mustang Cars & Trucks

1 Answer

1991 Honda Accord Sta Wgn EX Auto.Car runs great with 435K all original. Trouble starts at speeds above 60. First sign is RPM tach becomes erratic on its own with no associated engine roughness. Keeping...

ever tune it up,?
carb engine, or EFI?
the tacho action tells you the primary ingition side is failing.
the jumper is inserted, in the EFI , code 8 is spark misfire.
jumper the service check connector , 2 pins.
code 8 can clear fast, so you make engine mistfire, watching the lamp. but is only more evidence that the the ECU can not fire the coil.
The Tacho proves that. if the code 4 or 9 show up, bingo.
drive with the jumper planted.
see page 6-96 in the FSM book.

Aug 22, 2013 | 1991 Honda Accord

1 Answer

Engine is running erratically

You have probably already done this, but...
Recheck your connections to the new components.
Then check your spark plug & spark plug wire on the non firing cylinder. Next you need to check out the coil.

Jan 19, 2009 | BMW R 1150 GS Adventure Motorcycles

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