89 Renix New Problem! Hard Start When Hot?

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Mar 1, 2012 | 10:02 AM

#16

hankthetank

CF Veteran

Joined: Nov 2011

Posts: 2,322

Likes: 1

From: Edmonton

Year: 1990

Model: Cherokee

Engine: 4.0

starter. worn out brushes make it more sensitive to excessive heat...

Mar 1, 2012 | 03:36 PM

#17

cruiser54

::CF Moderator::

Joined: Aug 2011

Posts: 43,971

Likes: 1,578

From: Prescott, Az

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by Guntar13

thank you flinstone for the reply, those seals were the first thing i fixed when i got the jeep due to them leaking really badly, now its bone dry!

Cruiser, I know youve been around the block a few with these jeeps, do you think that the CPS could be a cluprit but only when its getting hot? like i said when its cooled off it starts normal, but when its been driven for a while and shut down then restarted its as if the battery is drained, just a much slower crank time.

BTW: Went to three other places and had the charging system checked and it checked good every time.

Very well could be the CPS. One way to tell would be to test the output voltage when it won't start. Have you ever checked the output voltage at all? That could provide a clue.

Mar 1, 2012 | 04:25 PM

#18

hankthetank

CF Veteran

Joined: Nov 2011

Posts: 2,322

Likes: 1

From: Edmonton

Year: 1990

Model: Cherokee

Engine: 4.0

i see this on some of the smaller dc motors here at work. the brushes wear out and the motors wont start, or start slowly even with a vfd. new brushes and they work. If i were in your shoes, i would replace the starter anyway, its like 23 years old...

Mar 1, 2012 | 04:37 PM

#19

cruiser54

::CF Moderator::

Joined: Aug 2011

Posts: 43,971

Likes: 1,578

From: Prescott, Az

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by cruiser54

Very well could be the CPS. One way to tell would be to test the output voltage when it won't start. Have you ever checked the output voltage at all? That could provide a clue.

And hankthetank is correct that a hot starter could be responsible for the slower cranking speed.

Dec 10, 2017 | 08:58 PM

#20

Modrod

Member

Joined: Sep 2010

Posts: 191

Likes: 3

From: Albuquerque, NM

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0 XJ

Try the Starter relay. .

I know this is an old thread, but people use old threads to help fix their Jeeps. I had the same exact problem, I replaced almost everything. It ended up being the starter relay, it was old and not making good contact, not giving the starter all the amps and volts it should get.