Strange problems after head swap
01-08-2014 | 01:48 AM
#34
CF Veteran
Joined: Apr 2009
Posts: 4,734
Likes: 11
Year: 2015, 2012
Model: Grand Cherokee (WK2)
Engine: 3.6L
It was either an existing problem in the head (or valvetrain) as I mentioned earlier, or spraying starting fluid into a hot high idling engine caused it to lock up and bend something.
01-08-2014 | 04:02 AM
#35
Junior Member
Joined: Dec 2013
Posts: 61
Likes: 0
From: Southern Indiana
Year: 2000
Model: Cherokee
Engine: AMC 242ci 3964cc I6
Hey guys, so just a few days ago I finished a head swap on my 2000. Thanks 0331. Anyways, after finishing the project, got everything hooked up we let it run for about 30 minutes no problems at all, just the general smoke from all the oil and stuff. I turned it off and let it sit for a while. Later that day I drove it to get gas and the CEL came on, went and got it checked. My Camshaft sensor was throwing a code, so I cleaned it up and the light went away. Well now its gotten worse, it has a very noticeable rough idle, it sputters at acceleration, and the muffler is louder than ever. It all goes away at about 1500rpm. The rough idle will come and go as the Jeep gets warmer. Yesterday I cleaned every single plug and wire I could touch, it didn't go away. I gave the tb a real quick cleaning and the idle was a little less rough.
Are there any ideas out there? Its my DD and I need it to run like a champ.
Are there any ideas out there? Its my DD and I need it to run like a champ.
01-09-2014 | 03:24 PM
#36
Thread Starter
Junior Member
Joined: Sep 2012
Posts: 80
Likes: 0
From: Lynchburg Va
Year: 2000
Model: Cherokee
Engine: 4.0 I6
Compression test is done, results are; 150,153,155,150,152,155. Installed a new intake manifold. Also did a voltage test on iac, tps, cps, map, o2 sensors. Everything came out fine. Problem still exists...
01-09-2014 | 03:49 PM
#37
CF Veteran
Joined: Apr 2009
Posts: 4,734
Likes: 11
Year: 2015, 2012
Model: Grand Cherokee (WK2)
Engine: 3.6L
I assume OBDII would set a code for misfiring injector(s) or ignition problems such as bad wire(s) or plug(s).
If the computer is not setting codes then I still lean toward a mechanical problem in the valve train.
Seafoam ain't going to help it.
If the computer is not setting codes then I still lean toward a mechanical problem in the valve train.
Seafoam ain't going to help it.
01-10-2014 | 10:52 AM
#40
Thread Starter
Junior Member
Joined: Sep 2012
Posts: 80
Likes: 0
From: Lynchburg Va
Year: 2000
Model: Cherokee
Engine: 4.0 I6
Well, we tested the wires one more time, power is going to everything at the right levels. Then tested the sensors themselves. My TPS didn't change voltage level at all though any of the tests. It seems the TPS is shot. We started the Jeep and let it run, while it wasn't up to temp it ran fine, once it started getting what I'd say around 175, the rough idle started to slowly appear. It never got as bad as it was, but it was still worse than a normal 4.0 shake.
01-10-2014 | 12:45 PM
#42
CF Veteran
Joined: Aug 2010
Posts: 8,357
Likes: 90
From: Canton, MI
Year: 1999
Model: Cherokee
Engine: 4.0
Well, we tested the wires one more time, power is going to everything at the right levels. Then tested the sensors themselves. My TPS didn't change voltage level at all though any of the tests. It seems the TPS is shot. We started the Jeep and let it run, while it wasn't up to temp it ran fine, once it started getting what I'd say around 175, the rough idle started to slowly appear. It never got as bad as it was, but it was still worse than a normal 4.0 shake.
Its hard to believe that the TPS didn't change voltage at all during testing and the engine runs smootly until it heats up.
01-10-2014 | 03:48 PM
#44
CF Veteran
Joined: Aug 2010
Posts: 8,357
Likes: 90
From: Canton, MI
Year: 1999
Model: Cherokee
Engine: 4.0