Question about 1990 Jeep Wrangler

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Is there any way to test an ignition module for a 1990 jeep wrangler with a 4.2 L carbed engine or to test the pick up coil

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Parts stores can test module

Posted on Nov 10, 2010

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These ignition modules are known for dying if you leave the ignition on for more than 5 minutes without the engine running. All the autoparts stores have low-quality imitation remakes that are even worse than the OEM one. I would just assume it has died and not even hassle with testing it. Coils are much more reliable and it probably isn't bad. I eventually gave up on trying to find a good one and just went with an MSD 6A.

Posted on Jun 17, 2014


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1990 jeep wrangler 2 carbureted fuel pump runs about a second ,fuel shoots out pline at back of carburetor, but none will spray inside

must be 4.2L engine the 2.5 is EFI TBI.(French EFI)
the 4.2 has computer controlled carb from H3LL
never ever buy a jeep like this, ever.
if hellbent on this bad car, to fix then buy the service manuals off fleabay.. (id not even hesitate there)

my guess is the carb is bad, what checks matters are.
fuel nozzles dead, is that.
1: fuel pressure at spec. not dribble tests. (no dribble yes, means pump dead) (using a real pressure gauge)
2: float level correct. ? if bowl dry bingo. !
3: jets not clogged, inside carb.
4; carb computer working (Tests stated in SM)
5: dead carb solenoids.

there is no worse car than a ECM controlled carb. horrid system.
ended in 91. as Chrysler took over..from AMC

join a real jeep forum and hear them moan, ?

2 fuses need to be good, F1 and F2, 1amp rated.
in the diode fuse assembly.
or the idle solenoid goes dead.

Mar 13, 2017 | 1990 Jeep Wrangler

1 Answer

Where is ign.module for 89 6cyl. wrangler

ok just the word, 6cylinder.
but they had many.
early wrangler ,called the YJ jeep. true name.
be nice to know the VIN, number, xxxx on end.,
this tells the helper whats there, if still stock , is it? many are NOT.
many this old are engine swapped,
no photos by you of engine nor distributor...
nor the connector pin count on side of distributor.
lets do displacement first is it the 4.0L ?
with throttle body. injection, or a carb.?
1989 is a year of rapid changes, I had 2x 88s.
some have the french EFI , called Renix.
with 4 injectors, and a brain dead ECU. horrid.
this have there very own different spark systems.
I think the last carb ever on wrangler is 1987.
before this worse electronic carbs, yup , avoid them.
4.2L inline 6 no the 4.0L (5million made)
looks like injection did not happen on YJ until.... 1991. later
than all other jeeps, 4 years, late.
I had many of the others, my beloved, Comanche 88
500k miles long....
has spark timing, check.
has distrib. check
has sepr. coil check' has module outside, check.
im on line now at mitchells so could you.
The ignition module is mounted next to the battery on all models. It is a sealed, weatherproof unit on the 4.2L engine. 1987-90 vehicles equipped with a 2.5L engine, incorporate the coil in the control module."

seem you have this. says wiki.
4.2 L AMC straight-6 engine, 358cu/in. engine.


Nov 28, 2016 | 1995 Jeep Wrangler

1 Answer

I don't have any power at the ignition coil on a 1987 wrangler, any place to start ? thanks

fuses are always first.
you said no power to the coil that means 12vdc power.
so hows car run with no power to coil no electric power?
ok, seems its , running good, then you lose engine power (not usage of word engine) then you find loss of 12vdc power to the ignition coil
you blew a fuse.
1987, carb engine
no engine stated, making any spark help near impossible
2.5L Vin H, TBI injection
4.2.L Vin C, 2bbl carb.
apples and oranges different (huge difference)

the 4.2 liter gets power from a ballast resistor.
on the yellow wire . the igntion switch feeds the this resistor
the green wire, goes to the ignition module.
this wire reads 12v key on, then when cranked, or running
the module grounds the green wire for about 5/1000s of second
and then release this ground making Inductive spark (Tesla action)
. that is how the 4.2 works.

so what engine.?? some have 4.0 engine. so???

Sep 19, 2014 | 1987 Jeep Wrangler

1 Answer

I have a 1990 Jeep Wrangler 4.2 6Cly manual, with no spark. There seems to be four things that could be the problem, trying to narrow it down. Ignition switch, ignition Module, Ignition Coil, or...

Hi, You're on the right track, just check those out. Check the distributor cap it could have a crack in it too. If you're not getting any spark than it would be the ignition module. Have you had any codes from the computer this will narrow it down to 1 or 2 items. Good luck.

Nov 22, 2011 | 1990 Jeep Wrangler

1 Answer

I own a 1990 YJ Jeep 4.2 If I drive the Jeep every day it starts and runs great. If the car sits for several days it is extermly hard to start If I use a small amount of starting fluid, it will fire...

Sounds like the fuel pressure regulator. Its not holding the pressure over a period of time. Making it difficult to start after its been sitting.

Jul 03, 2011 | 1990 Jeep Wrangler

1 Answer

1990 jeep 4.2 no spark power 2 coil but no spark out of coil also have added a fuel injection,its a howel system get this a day later i go out and it starts right up wow what could it be

It is most likely the module inside of the distributor, and if you put a test light on the Neg. (-) side only of the ignition coil and crank the engine over you should see the test light pulse or blink off and on indicating that there is a dwell signal.

The dwell signal tells the ignition coil when to fire, and if there is no dwell signal then the problem is in the distributor, and if there is a dwell signal then the problem is with the ignition coil.

Jun 09, 2010 | 1990 Jeep Wrangler

1 Answer

1997 jeep wrangler no fire no fuel replaced coil fuel relay ignition module crank sensor

Does it have a pick up coil under the distribtor cap if you dont know ask ato zone if your jeep has a pick up coil

Apr 07, 2010 | 1997 Jeep Wrangler

1 Answer

No spark from ignition module on hot start


No spark. I have changed out the distributor cap, rotor, wiring from coil to cap, and coil was replaced. I checked the distibutor by turning ignition key and observing the rotor turn. What else can I check. I did not observe a module.

Jun 19, 2009 | 1995 Jeep Wrangler

3 Answers

1990 Jeep YJ 6 cyc. Won't Start---No Spark From Coil

It would be great if you could find the Ignition Control Module!!! From my experience on my Jeep...90 YJ 4.2 liter carb. it does not have one...Computer controlled only...

May 17, 2009 | 1990 Jeep Wrangler

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