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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1 Answer

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

get the ignition coil module tested, buy a cheap diagnostic on ebay for £20 and read the codes, its cheaper than getting a garage to do a diagnostic for you then once you know what the fault codes are you will know what the problem is

Apr 23, 2016 | Subaru Cars & Trucks

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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.

Nov 24, 2014 | Cars & Trucks

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Cylinder misfire coil

These engines have 3 coils and are paired 1 and 4 2 and 5 3 and 6 with a spark noid run to see if the paired cylinder has no spark if so remove coil from module and test the power supply to coil and with a logic probe test the trigger side if blinking with no spark your coil is bad. not blinking replace module.

Apr 17, 2014 | 1994 Buick Park Avenue

1 Answer

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.

Apr 06, 2014 | 1994 Jeep Cherokee Country

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.

Jul 09, 2011 | 1992 Chevrolet S-10 Blazer

3 Answers

Engine light keeps comeing on mecanic change o2 senser worked for half hour came back on cods keep saying its miss fireing have had this problem for a month know

Start Small work to Big = Saved Money!
The Code(s) should be telling the specific cylinder(s) that are misfiring. Do you know waht the code is?
Target those cylinders 1st before testing the unaffected cylinders.
The following should isolate the problem(s).
1. Spark plugs - take out-reconnect back to wires and test spark plugs for getting sparks. If none: Don't replace them yet. GO TO 2. If the spark plugs are worn, dirty them replace them.
2. Remove spark plugs form end of ignition wires and test for spark from the wire. If none: Don't replace them yet. GO TO 3.
3. Remove the wires from the coil connection and test the coil for spark for each cylinder. If none: Don't replace it yet.
4. Test each spark plug and wires this way.
5. Coil Packs normally provide fire for 2-cylinders at the same time. The two are paired across from one another.
6. Test the coil for fire, amount of fire and if there is both cyclinders firing.
Misfire and the O2 Sensor got replaced??
Good Luck and get back with me if you need additional help or if this solved the problem.

Nov 20, 2009 | 2004 Dodge Intrepid

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

2 Answers

89 f150 wont fire

i suspect a fuel pump malfunction. i would check there first. make sure the fuel **** fuse is good and well. check the lines for blockages. after you run the fuel pump/fuse/line test, go to the distributor/coil and test the spark value. i would also check wires as well. your problem should be in one of these specific areas.

Mar 04, 2009 | 1989 Ford F 150

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