How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask brownjeff Your Own Question
brownjeff, ASE Certified Technician
Category: Jeep
Satisfied Customers: 13886
Experience:  17 years experience, ASE certified, dealership certified, Service Manager for 15 years,
Type Your Jeep Question Here...
brownjeff is online now
A new question is answered every 9 seconds

1987 jeep cherokee: 4.0...replaced ignition module and coil

Customer Question

I have a 1987 jeep cherokee with a 4.0. I have no spark. I have replaced ignition module and coil and still don't have spark. There is power to the positive side of the coil when the key is turned on. what else could be wrong?
Submitted: 7 years ago.
Category: Jeep
Expert:  brownjeff replied 7 years ago.
Has the cam sensor (pick up coil) inside the distributor been checked or replaced?
Customer: replied 7 years ago.
no. were is this located? Is it just under the cap and rotor?
Expert:  brownjeff replied 7 years ago.
Correct it is under the distributor rotor.
Customer: replied 7 years ago.
how do I check this and how do I remove it?
Expert:  brownjeff replied 7 years ago.



  • Connect positive lead of a suitable analog voltmeter to blue wire at distributor connector. Connect negative lead of voltmeter to gray/white wire at distributor connector. Do not disconnect distributor connector. Make voltmeter connections through back of electrical connector.
  • Place ignition swittch in the On position and note voltmeter reading. Voltmeter should indicate 5 volts.
  • If there is no voltage reading, check voltmeter leads for proper connection. If there is still no voltage reading, disconnect ECU electrical connector and check for voltage between connector terminal C-16 and ground. If there is still no voltage reading, check ECU with diagnostic tool M.S. 1700.
  • If voltage is present, check for continuity between blue wire at distributor connector and ECU connector terminal C-16. If continuity does not exist, repair wiring.
  • Check for continuity between gray/white wire at distributor connector and ECU connector terminal C-5. If continuity does not exist, repair wiring.
  • Check for continuity between black wire at distributor connector and ground. if continuity does not exist, repair wiring.
  • With analog voltmeter connected as described in step 1, crank engine. Voltmeter needle should fluctuate while engine is being cranked. If voltmeter does not fluctuate, replace stator located inside of distributor.



    Fig. 6 Distributor stator assembly. 6-243 engines

    6-243 ENGINE


    1. Remove distributor .
    2. Remove rotor from distributor.
    3. Position distributor in a soft jawed vise to provide support for distributor gear removal.
    4. Using a small punch, drive distributor gear roll pin from distributor shaft and remove gear.
    5. Carefully remove distributor shaft from housing.
    6. Mark location of stator so that it may be installed in the same position, Fig. 6.
    7. Remove stator retaining screw and lift stator from distributor.
    8. Reverse procedure to install.
    Customer: replied 7 years ago.
    What is the ECU and were is it located?
    Expert:  brownjeff replied 7 years ago.

    Engine control unit (computer)


    Under RH Side Of I/P, Near Glove Compartment

    Customer: replied 7 years ago.
    Ok I did all tests. I have 6.93 volts and it fluxuates when you crank it over. I also have continuity to specs. whats next?
    Expert:  brownjeff replied 7 years ago.

    Check the crank sensor next:


    1. With engine at operating temperature, disconnect speed sensor electrical connector from ignition control module.
    2. Connect a suitable ohmmeter between connector terminals A and B, Fig. 8.
    3. Ohmmeter should indicate 125 to 275 ohms, if not replace sensor.
    Customer: replied 7 years ago.
    unsure on this test. Ignition module has two conections. one has one wire and the other three. your test does not match. were is the crank sensor and do I do this test with engine cold as it will not run?
    Expert:  brownjeff replied 7 years ago.
    Follow the pig tail of the sensor until you find the connector and disconnect it from there. There will be three connections on the connector but only two will have wires in them. You can still do the test cold as normally when it fails there will be no resistance at all
    Customer: replied 7 years ago.
    where is the sensor located?
    Expert:  brownjeff replied 7 years ago.
    Transmission bell housing on the passenger's side

    JustAnswer in the News:

    Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
    Web sites like
    ...leave nothing to chance.
    Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
    Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
    I will tell you that...the things you have to go through to be an Expert are quite rigorous.

    What Customers are Saying:

    • Thank you so much for your answer. My initial estimate was $325; I got it done for $100 - part and labor. Lynn B. Ormond Beach, FL
    < Previous | Next >
    • Thank you so much for your answer. My initial estimate was $325; I got it done for $100 - part and labor. Lynn B. Ormond Beach, FL
    • I was skeptical at first but thought I'd give it a try. I was pleasantly surprised. Your site actually is a quality service that I would recommend to others in a heartbeat. Stan Sayre, PA
    • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
    • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
    • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
    • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
    • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY

    Meet The Experts:

    • Chris


      Shop Foreman

      Satisfied Customers:

      Jeep Certified Master Tech
    < Last | Next >
    • Chris's Avatar


      Shop Foreman

      Satisfied Customers:

      Jeep Certified Master Tech
    • Mark's Avatar


      22 Year Factory trained technician

      Satisfied Customers:

      Jeep factory training........25 years in the industry.
    • Dave's Avatar


      Jeep Master Tech

      Satisfied Customers:

      Chrysler Triple Master, ASE master Tech AA degree in Auto.
    • moparfl's Avatar


      ASE Certified Technician

      Satisfied Customers:

      ASE Master Tech Chrysler Dodge Jeep Master Tech
    • Tim Mohr's Avatar

      Tim Mohr


      Satisfied Customers:

    • Ron Z.'s Avatar

      Ron Z.

      - Jeep Tech -

      Satisfied Customers:

      18+yrs experience. State Inspector & Jeep Diagnostics/Repair
    • jeepmopar76's Avatar


      Jeep/Chrysler Triple Master Tech

      Satisfied Customers:

      32yr ASE Master Tech, 9yr Chrysler Master Tech, 19 yr Jeep Dealership service including AMC/Eagle