Rough Idle?

truck7575

NAXJA Forum User

Location

georgetown

• Dec 15, 2010

• #1

I have a rough idle, I have replaced the O2 sensor, not really sure where to go from there, the engine is the Renix setup on a 96 block, with a rusty's air tube and K&N filter. Any ideas would be much appreciated.

 

C

cruiser54

NAXJA Forum User

Location

Prescott, Az

• Dec 15, 2010

• #2

Start with the basics. Fresh tune up hardware?
Clean your throttle body and IAC. Check for vacuum leaks in the CCV piping between the valve cover, intake manifold and air cleaner. Are the CCV hoses clear and not blocked up?

 

87manche

NAXJA Forum User

Location

Ohio

• Dec 15, 2010

• #3

Things to check:
TPS adjustment/operation
CCV system
Grounds (crucial in the renix)
EGR system
Vacuum

Things to do
Clean IACV bore
clean throttle plate

 

truck7575

NAXJA Forum User

Location

georgetown

• Dec 15, 2010

• #4

Things to check:
TPS adjustment/operation
CCV system
Grounds (crucial in the renix)
EGR system
Vacuum

Things to do
Clean IACV bore
clean throttle plate

What is the IACV bore?

 

joe_peters

NAXJA Forum User

Location

Grants Pass, OryGun

• Dec 15, 2010

• #5

What injectors are you running?

 

truck7575

NAXJA Forum User

Location

georgetown

• Dec 16, 2010

• #6

Injectors, head and renix system are from my 88 cherokee pioneer, engine block is a 1996. What is the IACV bore?

 

I

ifixit8

NAXJA Forum User

Location

Northern IL

• Dec 16, 2010

• #7

it's on the throttle body. if you pull the throttle body off it is the hole that leads to the Intake Air Control Valve. the Iacv is round and has a 3 wire plug on it. When that gets dirty it can cause a rough idle. also any vacuum leak or bad gasket on the throttle body can cause rough idle to.

 

joe_peters

NAXJA Forum User

Location

Grants Pass, OryGun

• Dec 16, 2010

• #8

Factory original injectors? I hope not, they are XJ fire starters. Read this: http://www.jpmagazine.com/techarticles/engine/154_0811_preventing_jeep_engine_fires/index.html

Replace them, Neon or Ford (Bosch) injectors are inexpensive alternatives.

 

truck7575

NAXJA Forum User

Location

georgetown

• Dec 16, 2010

• #9

Awesome! I'll try it. Any body with any other idea's keep'em coming.

 

C

cruiser54

NAXJA Forum User

Location

Prescott, Az

• Dec 16, 2010

• #10

With the engine cold, snug up your intake manifold bolts working from the center to the outside edges.

 

truck7575

NAXJA Forum User

Location

georgetown

• Dec 16, 2010

• #11

I'm starting a list, I'm gonna get started on it asap! Keep em coming!

 

C

cruiser54

NAXJA Forum User

Location

Prescott, Az

• Dec 16, 2010

• #12

Refresh all your engine grounds. The one at the firewall going to the rear of the head. Remove, scrape paint off, clean til shiny. Reattach. I recommend replacing that POS braided cable with a #4 cable. At the dipstick tube stud, refresh those just like the other one. Clean, no paint, tight.

 

joe_peters

NAXJA Forum User

Location

Grants Pass, OryGun

• Dec 17, 2010

• #13

Checkout Rainman's injector upgrade chart here: http://www.naxja.org/forum/showthread.php?t=1027854