Question about 1986 Jeep Comanche

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Tuck has spark wont fire

Everything test out good on the truck but need to no if the coil and everything else works what could it be...?

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If you are getting spark all the way to the plugs, then you have not gone far enough. You need something to burn in the engine! You did not mention engine type or if injected or carbureted. A quick check can be done on either by simply squirting a small amount of starting fluid into airstream while cranking. If engine starts, then check for reason why no fuel condition. (best to do this after checking plugs for wet (flooding condition) or fouling from other source)

Posted on Jan 24, 2009


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Posted on Jan 02, 2017


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My subaru vivio wont start,everything else is working fine ignition coil is ok but spark is not firing?

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I have a 1982 seaswirl 2.5l,155 hp,.it's a gm,omc,won't start.I got no spark.I did the test and everything checks out good.I changed coil,cleaned and checked gap on points,all test spark if I...

Check to make sure you don't have a blown fuse/relay. Something is telling the coil not to fire. (Is the replacement coil new or used?) check your ground connections starting at the battery.

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Cylinder misfire coil

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Apr 17, 2014 | 1994 Buick Park Avenue

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I got a code 43 what do it mean

1994 Jeep, Cherokee?

check all EFI system fuse first with a meter.

that is ASD drop out.
all jeeps from 93 to now have ASD relays.

43 code (nice checking you did) is bad spark.
when the PCM sees bad spark it then shuts every thing down

cause is bad ignitor or coil.
the big v8, with the funny locking throttle body... short.
that is true if you crank for 5 full seconds.
to see if CMP sensor fails too.
cmp cam sensor is in the distributor base.
the ignitor is in the PCM, and drives the coil directly.
i presume spark is dead directly at the coil terminal
and is dead the first 2 seconds cranking. right.
takes 2 person to test spark. one at key , 1 and coil
the PCM only allows 2 seconds for spark to happen
if it fails ,it kills the ASD relay.
making trouble shooting tad hard , for those that dont know jeep ASD issues.
if the 5.2L cmp and CKP sensors work right, the PCM then creates spark
it does this via and ignitor.
the coil can be bad, as can the rotor and cap. id replace any old cap and rotor, fast. if the coil tower terminal HV. has good spark.

read failure to start test here
chapter 8D-6

and page 8w-30-4 , coil schematic.
as you can see, the coil has 12vdc key on for 2 seconds.
the PCM ground the minus coil pin.
this charges and fires the coil
the ignitor transistor is in the PCM on this car.
The PCM monitors this pin minus , and if it fails to pulse,
it knows the Coil is dead. and then shuts down EVERYTHING EFI wise.

that is how it works.
tricky yes,but true.

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1 Answer

I have a 98 vw jetta gl ABA and it wont start run.

I would check for spark on the ignition coil and the spark plug. If no spark, check the power and signal to the ignition coil. The ignition coil large wires are 12volts power and the other three is a signal to electronic firing circuit from ECM. Testing the power is easy, for testing for trigger signal, use a 12v LED test light.
12 Volts test:
Signal test:

Jun 04, 2017 | 1998 Volkswagen Jetta

1 Answer


on the straight six you will remove the bolt holding each coil to the valve cover. Remove one coil and use either a spark tester or a test light. If there is spark the coil is good. If there is no spark swap that coil with another. If the swapped coil fires than you know the circuit is good. If the coil that didn't fire still doesn't fire than you know the coil is bad.

Did that help?

If you have any questions let me know.

Oct 06, 2011 | 2002 GMC Envoy

1 Answer

I can't get my 1992 Chev S10 2.5 liter to fire. What could be the problem?

It could be alot of things but I would try one thing at a time starting with the coil wire, then the cap and rotor. It could be the coil itself. If you havent worked on it before it happened then it is probably the ignition module inside the cap. It has a spark control and a knock sensor among other things that have alot to do with the spark. Theres a pick-up coil in the distributer that sometimes shorts out. But vary rarely. If you have a multi meter and some time there are tests to check out everything. You need to go in a line backwards so that you can run the problem down. Pull a plug and plug it in to the wire and set the bottom of the plug on something metal on the engine, spin the engine over and look for it to spark against the metal. Just be super careful because a spark needs a drop of gas , to BOOM you get to learn how to stop a fire. That kinda tells you if the plug is good. Then pull the plug off and stick a nail in the wire and ground the nail and spin it and see if you get a spark if not then move up to the coil wire. And so on and so on until you find a spark. If you have a test light check to see if you get power to the distributer , if you do and it wont spark then its most likely the ignition modual.

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1 Answer

No spark

hi, i did a head on a nissan and had similar problems , what i had missed was one ground wire that i tucked neatly out of the way by the firewall, must have been a very important ground .. hope this is your fix

Oct 22, 2009 | 1992 Nissan 240SX Fastback

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