Runs terrible for 3 minutes .....then fine

Joe Magic · 02-28-2005, 07:35 PM

Almost like a sticking cold choke, my 97 wrangler runs terrible for the first few minutes. Once is passes the sputtering, back firing stage it runs fine. This happens on a start up, even after Its been off for a few minutes. I changed plugs,wires,air filter and still no change. It also runs a bit loud in the beginning like a possible exhaust leak that heats up and seals itself. Could this be the problem?

Any ideas? Thanks in advance..

Joe

Flendo · 02-28-2005, 07:38 PM

Quote:

Originally Posted by Joe Magic

Almost like a sticking cold choke, my 97 wrangler runs terrible for the first few minutes. Once is passes the sputtering, back firing stage it runs fine. This happens on a start up, even after Its been off for a few minutes. I changed plugs,wires,air filter and still no change. It also runs a bit loud in the beginning like a possible exhaust leak that heats up and seals itself. Could this be the problem?

Any ideas? Thanks in advance..

Joe

does it burn oil?

Joe Magic · 02-28-2005, 08:34 PM

Does not burn oil, but I do have some timing chain noise..

FlyersFan2009 · 02-28-2005, 08:37 PM

I have a 97 and mind did the same thing.

I took it to the dealership and thought it was my fuel pump and the couldn't figure it out. It would start but run like crap for a few minutes and act like it was going to run out of gas.

Turned out it was my front O2 sensor.

Once I replaced that a few thousand miles ago, it's been great.

Alec · 02-28-2005, 08:37 PM

I asked this question in other thread a few minutes ago ..... an codes?

I am trying to learn .... if there is any code present .... it may be easier to pinpoint

BlueJ · 02-28-2005, 09:06 PM

Quote:

Originally Posted by Kopczyk

Turned out it was my front O2 sensor.

Once I replaced that a few thousand miles ago, it's been great.

Think I should try that for mine too then? Is it easy to install, and I heard to stay away from the Bosch, is that right?

ProfessorCRX · 02-28-2005, 10:03 PM

Electrpnic air control valve?

james985 · 02-28-2005, 11:56 PM

check to see if any of the exhaust manifold bolts are missing.. i had the same problem and my rear stud was sheared off. sounds like you have an exhaust leak to me. very notorious for these jeeps. i would also check the o2 sensors as earlier stated.

if it does go away when the jeep is warm i am 90 percent sure it is an exhaust leak or the o2's

02-28-2005, 08:37 PM	#5
Alec Registered User Join Date: Dec 2004 Location: Suburban Sprawl, PENNA Posts: 685 Profile Gallery Classifieds My Jeeps	I asked this question in other thread a few minutes ago ..... an codes? I am trying to learn .... if there is any code present .... it may be easier to pinpoint __________________ 97 Green Sahara - [CENTER] Powertrain envy sufferer - Softop tinkerer [/CENTER]

02-28-2005, 11:56 PM	#8
james985 Registered User Join Date: Feb 2005 Location: Kansas City, MO Posts: 99 Profile Gallery Classifieds My Jeeps	check to see if any of the exhaust manifold bolts are missing.. i had the same problem and my rear stud was sheared off. sounds like you have an exhaust leak to me. very notorious for these jeeps. i would also check the o2 sensors as earlier stated. if it does go away when the jeep is warm i am 90 percent sure it is an exhaust leak or the o2's __________________ [CENTER] 98 tj ar23's with 31's 4.10 gears [COLOR=Red]red jeep club member #283[/COLOR] [/CENTER]

02-28-2005, 08:34 PM	#3
Joe Magic Registered User Join Date: Feb 2005 Posts: 2 Profile Gallery Classifieds My Jeeps	Does not burn oil, but I do have some timing chain noise..

02-28-2005, 08:37 PM	#4
FlyersFan2009 Registered User Join Date: Nov 2004 Location: California Posts: 640 Profile Gallery Classifieds My Jeeps	I have a 97 and mind did the same thing. I took it to the dealership and thought it was my fuel pump and the couldn't figure it out. It would start but run like crap for a few minutes and act like it was going to run out of gas. Turned out it was my front O2 sensor. Once I replaced that a few thousand miles ago, it's been great.

02-28-2005, 10:03 PM	#7
ProfessorCRX Web Wheeler Join Date: Jul 2004 Location: New York Posts: 1,295 Profile Gallery Classifieds My Jeeps	Electrpnic air control valve?