1987 Jeep YJ Hard to start hot

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.
its"
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.

a 1987, no engine stated,?????????
open hood snap photo of engine (cell ) and post it
be the first ever.. and win the prize. dah?

6 engines possible gas/diesel/carb and EFI early.
one is carb. fueled
and French RENIX, OMG

test battery sounds like enough to turn truck over but not start also check the connections for loose or corrision

True, but you also have to consider 51K and 25 years of service. I would try a transmission drain and refill with a new transmission filter, see if that helps. Flush the lines or replace them also.

CHECK BATTERY VOLTAGE.IT SHOULD BE 12.5 VOLTS.IF BATTERY OKAY.YOUR FUEL FILTER COULD BE STOPPED UP.OR YOU NEED NEW PLUGS + WIRES + CAP AND ROTOR.

Mine did the same thing. Replaced the computer and works like brand new. Hope this helps.

see if your engine has a ECT sensor (temp sensor that delivers information to your ECM) they are installed on the intake side of the cylinder head, it usually has 2 cables, have it checked replace if necesary

a bad sensior on the thottle body

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...

Your Wrangler is a YJ and the model is an "S". A Wrangler manufactured in 1987 through 1995 are all YJ's and then from 1997 through 2006 are all TJ's. The new Wrangler models are dubbed JK's.