Need Help!!!!
12-29-2014, 10:06 AM
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Model: Cherokee
Need Help!!!!
I have a 2000 Jeep Cherokee Sport 4.0L. I recently replaced the cylinder head with an after market one because it had a crack between the 3rd and 4th cylinder. Let me give a little back story:
Right before Thanksgiving, I got gas (about 3/4 qtrs of a tank) and soon after I noticed that the Jeep starting sputtering and the idle was getting rough. I figured I got some bad gas, and so I put Seafoam into the tank and put some Seafoam into the throttle body to help clean things up. The next day, as I am driving into work, I noticed that it was still idling rough....and even go to the point where it got pretty violent. I took it to Precision Tune (bad mistake), and they ran diagnostics on my Jeep. It came up as a cylinder 5 & 6 misfire, and random cylinder misfire. They told me it was the coil pack, so I replaced the plugs and coil pack, and the problem still persisted. So I took it back home, and made some calls and did some research. A friend of mine told me to look into my coolant reservoir and see if I notice bubbles. My coolant was to low, so I filled it up and I immediately saw bubbles in the reservoir. (Note: A month prior, my Jeep overheated, so I replaced the thermostat and during that timeframe, I noticed my coolant was always getting low). That is where I concluded that my head maybe bad. I removed the old head, and I noticed that there was indeed a crack between 3 & 4. I ordered an aftermarket head, and installed it last week. The Jeep started up fine, but the Jeep was still idling rough, and it actually stalled out a couple of times when I drove around my neighborhood (started up with no problems each time it stalled). I looked at the IAC and TPS, and they seem fine. I did notice that there was some ticking coming from the rockers so my friend suggested that I break torque, and retorque the to 21 ft lbs. When I originally torqued them, I torqued them to 25 ft lbs because that was the lowest setting on the torque wrench. He also mentioned that I should have rotated the crank shaft because the cylinders are suppose to be in a certain position when torquing the rockers. I haven't done that yet, but I was goin to replace the spark plugs, and do the oil change anyways. Any advise, suggestions, or comments from anyone will be greatly appreciated......sorry for the long post.
Right before Thanksgiving, I got gas (about 3/4 qtrs of a tank) and soon after I noticed that the Jeep starting sputtering and the idle was getting rough. I figured I got some bad gas, and so I put Seafoam into the tank and put some Seafoam into the throttle body to help clean things up. The next day, as I am driving into work, I noticed that it was still idling rough....and even go to the point where it got pretty violent. I took it to Precision Tune (bad mistake), and they ran diagnostics on my Jeep. It came up as a cylinder 5 & 6 misfire, and random cylinder misfire. They told me it was the coil pack, so I replaced the plugs and coil pack, and the problem still persisted. So I took it back home, and made some calls and did some research. A friend of mine told me to look into my coolant reservoir and see if I notice bubbles. My coolant was to low, so I filled it up and I immediately saw bubbles in the reservoir. (Note: A month prior, my Jeep overheated, so I replaced the thermostat and during that timeframe, I noticed my coolant was always getting low). That is where I concluded that my head maybe bad. I removed the old head, and I noticed that there was indeed a crack between 3 & 4. I ordered an aftermarket head, and installed it last week. The Jeep started up fine, but the Jeep was still idling rough, and it actually stalled out a couple of times when I drove around my neighborhood (started up with no problems each time it stalled). I looked at the IAC and TPS, and they seem fine. I did notice that there was some ticking coming from the rockers so my friend suggested that I break torque, and retorque the to 21 ft lbs. When I originally torqued them, I torqued them to 25 ft lbs because that was the lowest setting on the torque wrench. He also mentioned that I should have rotated the crank shaft because the cylinders are suppose to be in a certain position when torquing the rockers. I haven't done that yet, but I was goin to replace the spark plugs, and do the oil change anyways. Any advise, suggestions, or comments from anyone will be greatly appreciated......sorry for the long post.
