It was excess fuel, but not from the injectors leaking. The extra fuel was from the massive crack in the exhaust manifold. It lets in outside air, which causes the downstream O2 sensor to read lean, then the computer adds fuel. Replacing the broken manifold actually gave me a noticeable increase in fuel mileage because of it.
I have the same year model Jeep except I have a Grand Cherokee if possible could we get an update on the quality of the new exhaust manifold and how it's holding up thank you
I am very happy with the exhaust manifold, has held up great so far, no leaks and it's my daily driver so it has been through alot of heat/cool cycles since I installed it. I see no reason it should not continue that way. The improvements in the design over the factory manifold, especially the expansion joint sections and the way the pipes meet at the collector should really reduce cracking and increase the life of the manifold. If anything changes I will certainly post an update video. Thanks for watching!!
Are you running oem motor/transmission mounts? I suspect worn out mounts were causing my exhaust manifolds and headers to crack. I installed the ironman4x4 motor mounts and poly insert in the trans.mount. its been several years on the motor mounts and 9 months on the tranny mount. No cracked exh.manifold. i hope i havent spoken too soon.
My mounts are new, no excessive movement from them. The factory exhaust manifolds are known for cracking, it has to do with the expansion rate of the stainless steel. That's why the replacements have the corrugated expansion sections added in.
this is where I got the manifold -- www.rockauto.com/en/moreinfo.php?pk=9104516&cc=1315943&pt=5860&jsn=858&_nck=ZExt1ysfqhqWnq%2BEvUNdS3Txyey60IDtnjPWF5UU9J0BWQv7pvqZbh%2BYrdIIoJ2QRIQ0dzB9u%2F%2B%2FmhVsDHsuNVrwTHdL74DXQ9omHwKww9HapUqDqeY1jLgXSG2YAJLxDZLXGSFZq0gwXl9uUta977mMtqxJB2T2QPc%2F%2FfLx%2B8wg1czRxb4LR2YFApv7XbuKcHnFsCMDk9DRio7M31P4vvebcpfukFFVQZnvl%2FVtTXk5%2BwnIPl%2FAqo3yVa5eALYIUAsNe5gFbHGDOAyP6pmolBVLMN68QitSypj%2F3Kt0QGWTaZziExhyMztA%2FH1E1EVp
Great video! I may have missed it, so I apologize if you said it and I missed it, but where did you get the new manifold? Also how hard were the fasteners to get off from the manifolds?
If the manifold is cracked, it allows exhaust to leak out, which causes a few problems. First, if the crack is located near any wiring or hoses, the hot exhaust gases will melt them, and increase under hood temperatures. If the leaking exhaust gases make it inside the cab, it could cause a carbon monoxide issue for the driver or passengers. The problem it was causing me, and where I noticed the most difference, was in fuel mileage. The exhaust manifold is in front of the oxygen sensor. As exhaust is leaking out of the manifold, it causes the oxygen sensor to read a lower than expected amount of fumes, which in turn causes the computer to attempt to compensate for a perceived lean condition by increasing fuel delivery, causing a decrease in fuel mileage.
![Jeep Cherokee: Cylinder Head Gasket Replacement Procedure/ 0331 TUPY 4.0L ['96-'01 XJ]](http://i.ytimg.com/vi/j_uNYbUiASg/mqdefault.jpg)
Knuckle Busters,
Thanks for your time.
Thank You!!
Great video
Glad you enjoyed it, thanks for watching!!
Wow i ordered a new manifold from the Rock for $104 delivered last night and your vid just came up in my queue. They must be watching...
🤣🤣 They are always watching -- LOL!!
Thanks for the video. I think that might be gas in those ports from leaking injectors.
It was excess fuel, but not from the injectors leaking. The extra fuel was from the massive crack in the exhaust manifold. It lets in outside air, which causes the downstream O2 sensor to read lean, then the computer adds fuel. Replacing the broken manifold actually gave me a noticeable increase in fuel mileage because of it.
I have the same year model Jeep except I have a Grand Cherokee if possible could we get an update on the quality of the new exhaust manifold and how it's holding up thank you
I am very happy with the exhaust manifold, has held up great so far, no leaks and it's my daily driver so it has been through alot of heat/cool cycles since I installed it. I see no reason it should not continue that way. The improvements in the design over the factory manifold, especially the expansion joint sections and the way the pipes meet at the collector should really reduce cracking and increase the life of the manifold. If anything changes I will certainly post an update video. Thanks for watching!!
Are you running oem motor/transmission mounts? I suspect worn out mounts were causing my exhaust manifolds and headers to crack. I installed the ironman4x4 motor mounts and poly insert in the trans.mount. its been several years on the motor mounts and 9 months on the tranny mount. No cracked exh.manifold. i hope i havent spoken too soon.
My mounts are new, no excessive movement from them. The factory exhaust manifolds are known for cracking, it has to do with the expansion rate of the stainless steel. That's why the replacements have the corrugated expansion sections added in.
Hi,nice works!link with manifold bay please,thanks a lot
this is where I got the manifold -- www.rockauto.com/en/moreinfo.php?pk=9104516&cc=1315943&pt=5860&jsn=858&_nck=ZExt1ysfqhqWnq%2BEvUNdS3Txyey60IDtnjPWF5UU9J0BWQv7pvqZbh%2BYrdIIoJ2QRIQ0dzB9u%2F%2B%2FmhVsDHsuNVrwTHdL74DXQ9omHwKww9HapUqDqeY1jLgXSG2YAJLxDZLXGSFZq0gwXl9uUta977mMtqxJB2T2QPc%2F%2FfLx%2B8wg1czRxb4LR2YFApv7XbuKcHnFsCMDk9DRio7M31P4vvebcpfukFFVQZnvl%2FVtTXk5%2BwnIPl%2FAqo3yVa5eALYIUAsNe5gFbHGDOAyP6pmolBVLMN68QitSypj%2F3Kt0QGWTaZziExhyMztA%2FH1E1EVp
@@ludercoarms thanks a lot
Great video! I may have missed it, so I apologize if you said it and I missed it, but where did you get the new manifold? Also how hard were the fasteners to get off from the manifolds?
Manifold came from rockauto.com The fasteners were not bad, but I live in the south and so I don't get the bad salt corrosion.
Is there noise associated with the crack?
There was on mine, but I have seen others where there was no noticeable noise. Even on mine it was not super loud.
what the effect if manifold crack?
If the manifold is cracked, it allows exhaust to leak out, which causes a few problems. First, if the crack is located near any wiring or hoses, the hot exhaust gases will melt them, and increase under hood temperatures. If the leaking exhaust gases make it inside the cab, it could cause a carbon monoxide issue for the driver or passengers. The problem it was causing me, and where I noticed the most difference, was in fuel mileage. The exhaust manifold is in front of the oxygen sensor. As exhaust is leaking out of the manifold, it causes the oxygen sensor to read a lower than expected amount of fumes, which in turn causes the computer to attempt to compensate for a perceived lean condition by increasing fuel delivery, causing a decrease in fuel mileage.
I gotta do this to mine. Not looking forward to it.
It's not too bad, just put a bunch of penetrating oil on the bolts and studs the night before and take your time.
@@ludercoarms yeah, I wondered about the bolts. Mine look pretty crusty, even for being a southern jeep with zero rust on the body.
@@marka.2715 you can get new ones, not a bad idea to have a set on standby, or just go ahead and replace them all.