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1987 Wrangler ignition failure


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Hotrod19
New User

Nov 2, 2009, 8:58 AM

Post #1 of 8 (2765 views)
post icon 1987 Wrangler ignition failure Sign In

1987 Jeep Wrangler(130K miles), 4.0L , Weber Carb. Standard shift. Engine cranks, but no spark, I changed the ignition module and coil, no help. There seem to br three major parts to the system; the distributor, ignition module and coil. There is voltage at the coil, but I want to check/test the dist. Any ideas using DVM, o'scope... . Thanks, Hotrod19


Loren Champlain Sr
Veteran / Moderator
Loren Champlain Sr profile image

Nov 2, 2009, 7:52 PM

Post #2 of 8 (2757 views)
Re: 1987 Wrangler ignition failure Sign In

Hotrod; Check the crank sensor.
Loren
SW Washington


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Nov 3, 2009, 3:49 AM

Post #3 of 8 (2756 views)
Re: 1987 Wrangler ignition failure Sign In

Are you sure about what engine you have. They didn't offer a 4.0 in an 87 Wrangler



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Hotrod19
New User

Nov 3, 2009, 5:22 AM

Post #4 of 8 (2750 views)
Re: 1987 Wrangler ignition failure Sign In

I am not an expert, but I don't think a
carbureted engine has a crank sensor. I if did where is it located? Thanks


Hotrod19
New User

Nov 3, 2009, 5:23 AM

Post #5 of 8 (2749 views)
Re: 1987 Wrangler ignition failure Sign In

ok, 4.2 L.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Nov 3, 2009, 5:51 AM

Post #6 of 8 (2743 views)
Re: 1987 Wrangler ignition failure Sign In

No, it doesn't have a crank sensor but it has a pick up coil in the distributor that does the same job as a crank sensor.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Hotrod19
New User

Nov 3, 2009, 5:53 AM

Post #7 of 8 (2739 views)
Re: 1987 Wrangler ignition failure Sign In

Agreed. I am trying to find someone who knows how to test the distributor, such as pick up coil resistance.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Nov 3, 2009, 6:00 AM

Post #8 of 8 (2735 views)
Re: 1987 Wrangler ignition failure Sign In

Measuring resistance will help but to be sure you need a portable lab scope to view the wave pattern. You could rig a noid light at the -side of the coil and a power supply to determine if the pick up is working also.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







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