Engine runs rough when first started

Reply Subscribe

Thread Tools

Search this Thread

Jun 10, 2013 | 04:34 PM

#16

freegdr

CF Veteran

Joined: Mar 2010

Posts: 47,923

Likes: 38

From: Broward County Fl.

Year: 1989 xj sport 2dr

Model: Cherokee

Engine: 12 hole bosch Injectors

Last time you change plugs?

Last edited by freegdr; Jun 10, 2013 at 04:37 PM.

Jun 10, 2013 | 04:49 PM

#17

Programbo

CF Veteran

Joined: Jan 2009

Posts: 1,964

Likes: 6

From: Baltimore, Maryland

Year: 1994 1993

Model: Cherokee

Engine: 4.0

Quick question. When you first start it up does it seem to crank longer than it should before it starts?

Jun 10, 2013 | 04:58 PM

#18

freegdr

CF Veteran

Joined: Mar 2010

Posts: 47,923

Likes: 38

From: Broward County Fl.

Year: 1989 xj sport 2dr

Model: Cherokee

Engine: 12 hole bosch Injectors

Quote:

Originally Posted by hobbz

No smoke on startup, so there shouldn't be excess fuel in the cyl.

Cycle fuel pump 3 or 4 times before starting and same thing, so the rail pressure/fuel pump is ok.

All standard tune up stuff is new.

Tune up after issue or b4 define standard ?

Jun 10, 2013 | 06:13 PM

#19

hobbz

Thread Starter

Newbie

Joined: May 2013

Posts: 11

Likes: 0

From: Ashland, KY

Year: 1996

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by Programbo

Quick question. When you first start it up does it seem to crank longer than it should before it starts?

Nope, starts right up.

the PO changed all fluids, plugs wires filters about 2 months ago. Not sure if issue was before or not.

Jun 11, 2013 | 11:15 AM

#20

3hounds

Newbie

Joined: Mar 2012

Posts: 18

Likes: 0

From: PA.

Year: 99

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by hobbz

That is the first good suggestion yet. I was wondering how long till someone suggested something helpful instead of throwing out random useless ideas like "check o2 sensor"

It wasn't random, I had the same problem and a new o2 fixed it.

Also checking the on board diagnostic won't do **** if there's no check engine light.

Did ya check the useless 02 sensor, doubt it.

3

Last edited by 3hounds; Jun 11, 2013 at 11:19 AM.