Question about 1990 Jeep Comanche

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I have a 1990 jeep comanche that does not have spark, i have replaced the crank sensor, wires, coil and module. i have power to the module and the coil tests good.i am out of ideas

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Try your camshaft position sensor. A lot of people over look that part. I had the same problem in a 95 YJ and did everything you did, but when I replaced the camshaft sensor it started right up. Hope this helps. Oh yeah, and it is located in the distributer. It is the black plastic disc with the wires comming out. Took me forever to figure out where it was at first!

Posted on Jul 07, 2009

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I would go to a automotive parts store and buy a spark plug tester, it looks like a spark plug except it has a clamp on it and a crome plated ring around the spark post, you unplug one spark plug wire from the spark plug on your engine, put the tester in the wire, clamp it to a post on the engine, and have someone try starting your truck, if you see spark in the end of the tester it is good and if not the wire is bad or something in that connection, if all are good and you have spark in all the wires, you have a problem in the pistons...........start with this and go from their...............hope this helps.

Posted on Jun 27, 2009

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1 Answer

89 Jeep Comanche cranks, but has no spark


no spark to all 6 cylinders, or just 2 ????????????????????????
did you check all fuses first??????????
did you check that the CEL lamp glows, key on? MIL lamp?
if not? the main is dead, or fuse dead.(blown)
ok this is the very very old and obscure Jeep Bendix/Renix system.
the hard part is , it is NOT OBD1 engine yet, making diagnosis very hard. and no distributor. (new for MPI)


is yours the 4.0 I-6
and is it the 1 year, MPI engine? WITH MAF SENSOR!!
this is and AIR DENSITY SYSTEM unlike most other jeeps.
1989 - Changed to Renix MPFI. (read 4 injectors now>....)
i owned a 88 Comanche, love it. 200,k miles i drove from 0
other that ISC motor, zero issues. mine was TBI , no MAF.
NO spark.,?
this MPI has a coil pack with 3 coils in side, and uses the famous.
wasted spark design, even my new jeep v6 has this.
the coil is driven by a separate ICM , ignition control module.
The ICM, iis driven by the PCM(ECU)

your car has a CKP sensor (crank) fitted to the BELL
for the 3 marks, on the flywheel
quote FSM.
The Crankshaft Position Sensor (CKP) is secured by special shouldered bolts to the flywheel/drive plate housing. It is preset in its mounting at the factory and is non-adjustable in the field.
uq:
this means it tunes like a marconi radio, its not a hall sensor...!!!
its just a coil with weak outputs.
is it loose?
id do not know where the CAm CMP sensor is.
the online books mix 5 systems bad, this engine was EFI was
a one year only system. (French)
My wild guess is the CMP is this funny device, on the right
side of engine, where the DIZZY USED to be. called the cam sensor.
that too, must work and i think its a hall sensor and is very easy to test.
sadly no OBD1 and no CEL: flash codes.
to blink out, CMP/CKP dead. cranking
just very old factory scan tool works

again, all spark dead or only 2?

Mar 29, 2014 | 1989 Jeep Comanche

1 Answer

Have 87 jeep comanche, have been told it has a cam shaft sensor, to keep it in time , if so where is it located? the engine is a 4.0


The cam sensor is located in the distributor.check the cylinder compression, check for ignition spark, check for fuel injector pulse and fuel pressure.

Aug 06, 2012 | 1987 Jeep Comanche

1 Answer

1988 jeep comanche will not start


code scan vechicle first could be faulty asd relay.

Nov 21, 2011 | 1988 Jeep Comanche

1 Answer

1990 gmc 6500 topkick with no spark or injector pulse. all 4 wires on the ignition coil have battery voltage with key on. is coil shorted or is the ignition module bad?


You are jumping to conclusions. Slow down.
No spark AND no injector pulse indicates none of the desired outputs were triggered. The ignition module makes spark when it receives a crankshaft position sensor signal, and then transfers control of that spark to the computer after it starts. The module takes its crank sensor signal and generates an RPM count that it forwards to the PCM(main computer) which is used for triggering the injectors and controlling timing. SO, if you had a bad crank sensor OR a bad ignition module, you could lose both spark AND fuel. a coil would not disable injector pulse. modules RARELY fail in a manner that disables RPM reference to the computer causing it to not fire the injectors...At this point, I would TEST the crank sensor as the next step. If its easier, 1 of the wires on the module goes directly there so you can test the crank sensor at the module.

Sep 18, 2009 | 1990 GMC K3500

2 Answers

No spark 1990 jeep cheroke


take your ignition module to a car shop, the shops i know all have these testers.
i do think its faulty but get it tested.
i test them by using an oscilliscope, very expensive.
if not sure i then tset the phase sensor, i dont think you can as im sure a multimeter wont go low enough
on module, you have a 12 volt supply, earth, then phase signal, then a 5 volt amplified comes out.
get a meter and stick on to low tension on coil.
12 volt when on
5 up and down when cranking.
if very low it is the module or power to module
more likely module.
if in doubt get back to me.

Aug 18, 2009 | 1990 Jeep Cherokee Limited

1 Answer

1987 jeep comanche 2.5L (gas). Engine died


Do you have a rpm guage? If so see is it moves when cranking, if not the crankshaft sensor is bad and is located on top of the transmission bell housing. Also it can be scanned to confirm a faulty sensor

Jul 12, 2009 | 1987 Jeep Comanche

2 Answers

1990 jeep wrangler has no spark


I think what you have is an in-between model for which I have no good information. Do a coil test using an ohmeter...(regardless of what it's on a coil is a coil) If it fails, replace it. Also check to see what is used to trigger the coil. there is likely a trigger in the distributor and a control module (possibly mounted next to the coil). sorry I dont't have better info...it happens sometimes.

Mar 23, 2009 | 1990 Jeep Wrangler

1 Answer

Help


ive run into this once before and it turned out to be the intake valve spring was broken not giving the correct seat pressure. not sure its your problem but it looks like you have covered all the other bases.

Aug 23, 2008 | 1990 Jeep Comanche

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