Cylinder 1 and 6 Misfire
04-03-2016, 01:26 PM
#17
Newbie
Join Date: Mar 2014
Location: NH Seacoast area
Posts: 11
Likes: 0
Received 0 Likes
on
0 Posts
Year: 2000
Model: Cherokee (XJ)
Engine: 4.0
Same prob...
I have the same probs w my 2000 XJ... ended up channging out my fuel rail and that fixed the prob for about a year... lots of sediment from running crap gas. She hates the cold and when I slow down like going thru ezpass after going fast or taking an exit my check engine will blink and it will start to misfire..but if I punch the gas quick it mostly catches itself and will turn to solid light and be fine.. if it misfired and hesitated I pull over. Shut it off turn the key to stop beeping and start it up... runs fine. I've changed the engine. Radiator. Can and crank shaft sensors. Fuel rail. Coil rail. Thermostat. Spark plugs. Misfired more on cold/wet.. am/pm.
Was also told recently that it could possibly need a thicker head gasket...felpro... cause cylinder 1 & 6 heat up more ie.. loop. Hope this helps.
Was also told recently that it could possibly need a thicker head gasket...felpro... cause cylinder 1 & 6 heat up more ie.. loop. Hope this helps.
I have a 2000 Jeep Cherokee Limited and have a constant misfire on cylinder 1 and 6. The misfire is soo bad that I am not driving it due to lack of power, and I'd rather not do any un-necessary damage.
SHORT STORY:
I replaced a "replacement" motor with the original motor in my jeep. That was a little confusing, I pulled and rebuilt my original motor, and now put it back in my jeep. I installed the Cam position sensor 180 degrees out the first time and it would not start at all, so I uninstalled it and put it back in following the toothpick in the access hole with the motor in TDC on the compression stroke. Now the motor starts up with ease, but cylinder 1 and 6 are not firing. I have not pulled the codes yet because I haven't been able to drive it to the parts store. But I know it is cylinder 1 and 6 by pulling the fuel injector wires on each cylinder to see which cylinders changed the way the motor was running.
LONG STORY:
I blew my original motor due to the head being cracked. I bought it from a guy who put that head sealer crap in it which made the jeep run awesome for 3,000 miles and when I got on a long stretch of interstate with no exits, the temp started rising but never went over 220 (or so the temp gauge says). So I continued to the nearest exit, and by the time I got there the motor was knocking and clanking around as if it was tearing itself apart! As soon as I brought the jeep to a stop, it shut itself down and started spewing smoke everywhere. Opened the hood to find blown head gasket and oil all over. Found out it blew a hole in a piston and head was cracked in 3 places. 0331 head FML
Pulled motor and put in replacement motor from a 99 cherokee that had a slight tick in it. Slight tick turned into wrist pin noise, and eventually grew to a loud knock. I put this motor in with the coil pack basically hanging on the cylinder head, and NEVER had an issue with ANY misfire the entire time it was in the jeep which was for about 10k miles.
Replaced the original motor in the jeep, with the 99 cylinder head. Now a misfire.
Will be replacing the spark plugs today, maybe this will yield results. But if not, what else should I be looking for? I will see if I have a compression tester at the house somewhere to test for compression, but I don't see how the compression would be lost, never had an issue with cylinder 1 or 6 on either of the motors. I've read that one of the coils runs cylinder 1 and 6 on a loop, so I could believe the coil to be suspect, but it was working perfectly fine 4 days ago when I pulled it. And when I pulled the spark plugs off cylinder 1 and 6 looked dry where as cylinder 5 still looked wet, could that be any indication of the fuel being shutoff to those cylinders by the computer for some reason?
And this problem is constant, I started it after the install of the motor and it was misfiring immediately and does not go away with higher RPMs, load/no load, or at operating temperature.
SHORT STORY:
I replaced a "replacement" motor with the original motor in my jeep. That was a little confusing, I pulled and rebuilt my original motor, and now put it back in my jeep. I installed the Cam position sensor 180 degrees out the first time and it would not start at all, so I uninstalled it and put it back in following the toothpick in the access hole with the motor in TDC on the compression stroke. Now the motor starts up with ease, but cylinder 1 and 6 are not firing. I have not pulled the codes yet because I haven't been able to drive it to the parts store. But I know it is cylinder 1 and 6 by pulling the fuel injector wires on each cylinder to see which cylinders changed the way the motor was running.
LONG STORY:
I blew my original motor due to the head being cracked. I bought it from a guy who put that head sealer crap in it which made the jeep run awesome for 3,000 miles and when I got on a long stretch of interstate with no exits, the temp started rising but never went over 220 (or so the temp gauge says). So I continued to the nearest exit, and by the time I got there the motor was knocking and clanking around as if it was tearing itself apart! As soon as I brought the jeep to a stop, it shut itself down and started spewing smoke everywhere. Opened the hood to find blown head gasket and oil all over. Found out it blew a hole in a piston and head was cracked in 3 places. 0331 head FML
Pulled motor and put in replacement motor from a 99 cherokee that had a slight tick in it. Slight tick turned into wrist pin noise, and eventually grew to a loud knock. I put this motor in with the coil pack basically hanging on the cylinder head, and NEVER had an issue with ANY misfire the entire time it was in the jeep which was for about 10k miles.
Replaced the original motor in the jeep, with the 99 cylinder head. Now a misfire.
Will be replacing the spark plugs today, maybe this will yield results. But if not, what else should I be looking for? I will see if I have a compression tester at the house somewhere to test for compression, but I don't see how the compression would be lost, never had an issue with cylinder 1 or 6 on either of the motors. I've read that one of the coils runs cylinder 1 and 6 on a loop, so I could believe the coil to be suspect, but it was working perfectly fine 4 days ago when I pulled it. And when I pulled the spark plugs off cylinder 1 and 6 looked dry where as cylinder 5 still looked wet, could that be any indication of the fuel being shutoff to those cylinders by the computer for some reason?
And this problem is constant, I started it after the install of the motor and it was misfiring immediately and does not go away with higher RPMs, load/no load, or at operating temperature.
Thread
Thread Starter
Forum
Replies
Last Post
MightyMouse8
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
14
10-08-2015 08:57 AM
zumer715
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
10
10-03-2015 07:07 PM
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)