rough idle and soot when cold

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Sep 30, 2011 | 11:02 AM

hi im adam

Thread Starter

Seasoned Member

Joined: Oct 2010

Posts: 310

Likes: 0

From: Muskegon, MI

Year: I've had a few...

Model: Cherokee

Engine: A secret

rough idle and soot when cold

Puzzle me this.

I put a new head on my 2000 xj

than it overheated! (air pocket in the pump)

Now it idles like **** when its cold.

(almost sounds like a misfire too)

OK, so I clean the choke and reset the CPU. no fix-o.

No check engine lights.

Sep 30, 2011 | 03:00 PM

tjwalker

CF Veteran

Joined: Nov 2010

Posts: 5,841

Likes: 117

From: In the middle of Minnesota!

Year: 1999

Model: Cherokee

Engine: 4.0

1. There is no choke on this engine. What exactly did you clean?

2. How badly did it overheat? What type of replacement head did you install? Hope you didn't crack this head as well......

Sep 30, 2011 | 03:48 PM

jomps

CF Veteran

Joined: Apr 2010

Posts: 3,966

Likes: 0

From: knoxville, tn

Year: 2000

Model: Cherokee

Engine: 98 4.0 I6

and check for codes stored

Oct 1, 2011 | 09:35 AM

hi im adam

Thread Starter

Seasoned Member

Joined: Oct 2010

Posts: 310

Likes: 0

From: Muskegon, MI

Year: I've had a few...

Model: Cherokee

Engine: A secret

IAC is a choke.

The head was never cracked. Piston 1 ex. Valve cracked and I put a 96 head on instead of messing with valves.

How bad did it over heat? Pretty bad. No water flow dew to airpocket in water pump. (Opps)

After it warms up, there is no issues.