difference between 4.0 and 4.0HO

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Jun 8, 2013 | 02:45 PM

#46

kwelch454

Newbie

Joined: Feb 2013

Posts: 7

Likes: 0

From: Halifax, NS

Year: 1998

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by salad

Bit late to the thread eh? Lol

Another Canadian eh?

I suppose I'll read the whole thread next time

Jun 8, 2013 | 05:23 PM

#47

cruiser54

::CF Moderator::

Joined: Aug 2011

Posts: 43,971

Likes: 1,579

From: Prescott, Az

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by kwelch454

Another Canadian eh?

I suppose I'll read the whole thread next time

From Canuckistan, eh? Follow salad. He's the HCIC.

Jun 9, 2013 | 01:31 AM

#48

89cherokee2gtmudy

Senior Member

Joined: Apr 2012

Posts: 735

Likes: 0

From: Los Banos CA

Year: 2000

Model: Cherokee

Engine: 4.0

For the 89 renix does the ecu change for the 89 model year or actually in 89? Reason I ask I'm just curious. If so how can I check? Also when I bought my comanche it had an extra ECM laying behind the seat. How can I determine what year it is out of and if its for a manual or auto?

Jun 9, 2013 | 08:06 AM

#49

cruiser54

::CF Moderator::

Joined: Aug 2011

Posts: 43,971

Likes: 1,579

From: Prescott, Az

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by 89cherokee2gtmudy

Model year, usually beginning production in June or July of the previous year.

Google the ECU part number to find it's application. Auto trans ECUs work on either one. IIRC, they have something in them to take care of the idle when the shifter is dropped into gear.