If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
1997 GC repair adventure
1997 GC Laredo 4.0L I6 with about 97K on it. All started with a check eninge
light and a LOT of exhaust noise. Pulled the code and got a 51- O2 sensor sez lean so the fuel system is dumping gas into the engine, which has caused the cat converter to overheat and go to pieces. While I'm down there, I discover that the exhaust manifold is cracked (suprise) and I figure the leak has caused a faulty O2 sensor reading. I replaced the exhaust with a Thorley tri- Y header, a Magnaflow high flow converter, and a flowmaster series 70. (If you have a typical Jeep exhaust manifold crack I HIGHLY recommend this upgrade- email me if you want to hear more about it) Also replaced the downstream O2 sensor- with a Mopar- since I was replacing the cat. Didn't replace the upstream one because I used the stock head pipe. Also replaced the blackened spark plugs. Ran a can of additive thru the gas to clear out the carbon. After all that I still have my code 51. I took the Jeep to the dealership who helpfully charged me $165 to tell me that there was nothing wrong- my upstream 02 sensor was "lazy." So I replaced the upstream O2 sensor today and so far the light is out BUT while I was under there I discovered that there is a vacuum line running from the front diff that is just hanging loose. I wouldn't swear I didn't knock it loose during the exhaust replacement, but I've looked everywhere and can't find a vacuum port for this hose to fit on. My 2 questions are this: 1) Does anybody out there know where the vacuum line from the front diff is supposed to connect and 2) What is the likelihood that the vacuum leak is causing my lean condition. Thanks for any help! Stu |
Ads |
#2
|
|||
|
|||
1997 GC repair adventure
That's no vacuum line, it's a vent line for the axle. At least on a
Wrangler, that line runs up along side the radiator on the driver's side which is probably similar to your GC. Look for some plastic snap-in pieces over in that area which are there to hold that hose. stupor0420 wrote: I discovered that there is a vacuum line running from > the front diff that is just hanging loose. I wouldn't swear I didn't knock it > loose during the exhaust replacement, but I've looked everywhere and can't > find a vacuum port for this hose to fit on. My 2 questions are this: 1) Does > anybody out there know where the vacuum line from the front diff is supposed > to connect and 2) What is the likelihood that the vacuum leak is causing my > lean condition. -- Jerry Bransford PP-ASEL N6TAY See the Geezer Jeep at http://members.cox.net/jerrypb/ |
#3
|
|||
|
|||
1997 GC repair adventure
it is run up by the steering gear and it's just a vent tube for the front axle
stupor0420 wrote: > 1997 GC Laredo 4.0L I6 with about 97K on it. All started with a check eninge > light and a LOT of exhaust noise. Pulled the code and got a 51- O2 sensor sez > lean so the fuel system is dumping gas into the engine, which has caused the > cat converter to overheat and go to pieces. While I'm down there, I discover > that the exhaust manifold is cracked (suprise) and I figure the leak has > caused a faulty O2 sensor reading. I replaced the exhaust with a Thorley tri- > Y header, a Magnaflow high flow converter, and a flowmaster series 70. (If > you have a typical Jeep exhaust manifold crack I HIGHLY recommend this > upgrade- email me if you want to hear more about it) Also replaced the > downstream O2 sensor- with a Mopar- since I was replacing the cat. Didn't > replace the upstream one because I used the stock head pipe. Also replaced > the blackened spark plugs. Ran a can of additive thru the gas to clear out > the carbon. After all that I still have my code 51. I took the Jeep to the > dealership who helpfully charged me $165 to tell me that there was nothing > wrong- my upstream 02 sensor was "lazy." > > So I replaced the upstream O2 sensor today and so far the light is out BUT > while I was under there I discovered that there is a vacuum line running from > the front diff that is just hanging loose. I wouldn't swear I didn't knock it > loose during the exhaust replacement, but I've looked everywhere and can't > find a vacuum port for this hose to fit on. My 2 questions are this: 1) Does > anybody out there know where the vacuum line from the front diff is supposed > to connect and 2) What is the likelihood that the vacuum leak is causing my > lean condition. > > Thanks for any help! Stu > |
#4
|
|||
|
|||
1997 GC repair adventure
Yup, that's the vent tube for the front axle. If you can't find the clips
that hold it in place, secure the free end up so that it is above the axle height (prevents gravity from possibly draining your dif.). T |
#5
|
|||
|
|||
1997 GC repair adventure
TM wrote:
> Yup, that's the vent tube for the front axle. If you can't find the > clips that > hold it in place, secure the free end up so that it is above the axle > height (prevents gravity from possibly draining your dif.). The clips are molded into the side of the airbox. Mine broke and I wound up using a ziptie onto one of the hard lines. -- DougW |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
auto repair software | Scott Smith | Technology | 1 | May 2nd 06 06:18 PM |
Front-End Repair? Maybe Just Throw It Away | Dotcom Computers Ltd | BMW | 0 | October 20th 05 11:02 AM |
Nationwide Crash Repair BEWARE Poor quality repair | Frustrated Car Owner | Technology | 16 | June 14th 05 08:36 PM |
New *FREE* Corvette Discussion Forum | JLA ENTERPRISES TECHNOLOGIES INTEGRATION | Corvette | 12 | November 30th 04 06:36 PM |