Question about Jeep Grand Cherokee

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I have a 1993 jeep grand cherokee with a 4.0 in it it doesn't have spark all the time i have changed the crank sensor and the coil but it still has a intermitate spark problem when the spark comes back it will keep running

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  • wasland_66 Oct 12, 2010

    helpful but i didn't ask question right

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  • Jeep Master
  • 17,970 Answers

I would check the resistance of the wires. A sensor doesnt provide any of the voltage in the system only signals. Are you getting any codes?

The signal from the Crankshaft Position (CKP) Sensor is used to determine crankshaft angle, engine speed, and basic timing. Powertrain Control Module (PCM) also uses the signal from the CKP sensor combined with the input signal from the camshaft position sensor to properly synchronize injection.

If you have a strong spark at the coil you have confirmed that the crank sensor is working. It is difficult to determine spark plug spark strength simply by the color of the spark. See if you can borrow a spark plug wire/plug kilovolt test meter. Made by snapon or otc. Or you could simply put a timing light on each spark plug wire as you turn it over you will see a timing light blink which will indicate that you have enough spark . Did you check fuel pressure and injector pulse. Can you get your hands on a noid light to check that the injectors are working? Most overlooked is the fact the the fuel injectors have their own fuse, but in this case a shut down relay. Check that each injector has battery voltage with key on at dark green with black wire on each injector. If no power suspect broken wire between injector harness and auto shut down relay. Also be sure to check pcm grounds at the engine block on the right side about 8 inches behind the distributor.

With a multi meter you can back probe the injector wire and read the voltage, do not pierce the wire as this will cause problems down the road with corrosion and voltage drop. You should read battery voltage (between 11.56 - 12.6) . If you do not have a meter you can use a test light... bright glow of test light would be good voltage. The ground strap is not the ground I spoke of. That is the general ground for the block. The PCM/ECM uses a brown wire size 16g wire behind or close to the distributor. check that you have continuity between that ground and the ECM (sorry about spelling errors).

I know you checked the asd relay, however just because it clicks and supplies power does not mean that that current/power has made it to its destination. Only by checking the injectors will you be certin. The ECM controls injector pulse by suppling the ground circuit to each injector so if you have no ECM ground, poor ground or loose connections at the ECM this could cause the problem. Did you check fuel pressure? Is the gas gauge lying? Does it turn over fast and steady but not start?

Crankshaft Position Sensor Connector:
PROCEDURE
1. Near the rear of intake manifold, disconnect sensor pigtail harness connector from main wiring harness.
2. Place an ohmmeter across terminals B and C. Ohmmeter should be set to 1K-to-10K scale for this test. The meter reading should be open (infinite resistance). Replace sensor if you read any resistance. That would be the test you where trying to find online Brian. However I believe your sensor is good, never rule out a bad wire though.

My brother in law have a 1993 Jeep GC Larado also, and recently didn't have spark either. We replaced my coil: didn't fix the problem. Then we started to think that it might be as simple as a fuse. There is a fuse panel under the hood where all the ABS controls are, inside is a 20amp fuse that controls the ignition. Mine was blown, once we replaced it, the vehicle started perfectly.

Test it and keep us update.

Posted on Oct 12, 2010

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6 Suggested Answers

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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: 1993 jeep grand cherokee will not start

Check to see it maybe a head gasket .mine was

Posted on Feb 28, 2009

  • 6982 Answers

SOURCE: 1993 JEEP GRAND CHEROKEE LAREDO- TRUCK WONT

OK...I have a 93 outside...one diagram I have shows an ignition module next to coil...but there is none on mine, (4.0 engine)
Two items to check are crank sensor and cam sensor inside distributor. Test procedure can be found in just about any manual including haynes.
You will need a decent volt/ohm meter to do testing. You can also check codes by turning ignition switch on/off three times, leaving it on the third time. Check engine will flash code #'s (ex: one flash, pause two flashes= the number twelve.then followed by a longer pause then another set of flashes etc.)

Posted on Mar 05, 2009

  • 108 Answers

SOURCE: no spark at coil

check ignition pick-up coil and ignition module

Posted on Mar 31, 2009

clarktravis8
  • 74 Answers

SOURCE: 1993 jeep grand cherokee laredo 4.0 no spark

First I would change the plugs, wires, distributor, and rotor button next I would make sure the firing order is correct then have timing checked if all check out have the cylinders tested.I hope this get your Jeep up and running. Please Rate Me . And you can always ask me wutxtye0rjd9d9ekmodqt1eoxkvn9hr9qjz1l3dabggyud7sdgr36czsrfxqenadhnijx9nfayi+sz1sug0aaaaasuvork5cyii=

Posted on Apr 26, 2009

jhettomyghet
  • 8 Answers

SOURCE: 1993 jeep grand cherokee

you might need to change the distributor

Posted on Apr 27, 2009

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OK...I have a 93 outside...one diagram I have shows an ignition module next to coil...but there is none on mine, (4.0 engine)
Two items to check are crank sensor and cam sensor inside distributor. Test procedure can be found in just about any manual including haynes.
You will need a decent volt/ohm meter to do testing. You can also check codes by turning ignition switch on/off three times, leaving it on the third time. Check engine will flash code #'s (ex: one flash, pause two flashes= the number twelve.then followed by a longer pause then another set of flashes etc.)

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