only running on 2 cylinders
06-16-2016, 07:53 PM
#1
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Model: Cherokee
only running on 2 cylinders
hey guys,
2000 jeep grand cherokee. its only running on two cylinders, got a p0303 code, shop said i probably got a flat spot on my cylinder or a hole in it. I'm not so sure cuz he didn't compression test the rest of the cylinders. replaced the spark plugs and coils, no help. i can un plug every wire to 1,2,3,5,6,7 and nothing changes, but unplug 4, or 8 and it starts to die, also has a hard time idling, real rough. what is going on?
2000 jeep grand cherokee. its only running on two cylinders, got a p0303 code, shop said i probably got a flat spot on my cylinder or a hole in it. I'm not so sure cuz he didn't compression test the rest of the cylinders. replaced the spark plugs and coils, no help. i can un plug every wire to 1,2,3,5,6,7 and nothing changes, but unplug 4, or 8 and it starts to die, also has a hard time idling, real rough. what is going on?
06-17-2016, 08:04 AM
#2
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Year: 1997
Model: Grand Cherokee
Engine: 4.0
I can tell you what's going on, you need to find a new shop that will take time to properly diagnose the issue instead of just throwing parts at it and giving you bogus reasons.
The code simply means there is a misfire on cylinder #3.
A full compression test would have given a lot more valuable information and would have been simple to do when replacing the spark plugs.
The code simply means there is a misfire on cylinder #3.
A full compression test would have given a lot more valuable information and would have been simple to do when replacing the spark plugs.
Last edited by Nick-B; 06-17-2016 at 08:06 AM.
06-17-2016, 09:13 AM
#3
Old fart with a wrench
Welcome to CF!
The above is very good advise. If that's all the information the shop gave you, you wasted your money. A full complete compression test will show you the condition of ALL the cylinders and if a couple are low, should show you if the rings are bad or a valve is burnt or the head gasket is bad.
We really are just guessing without this information. If it truly IS only running on 2 cylinders, it will die when you disconnect one. It WILL run on only 2, but those 2 have to be 4 cylinders apart in the firing order. That's assuming you have a 4.7 V8.
The above is very good advise. If that's all the information the shop gave you, you wasted your money. A full complete compression test will show you the condition of ALL the cylinders and if a couple are low, should show you if the rings are bad or a valve is burnt or the head gasket is bad.
We really are just guessing without this information. If it truly IS only running on 2 cylinders, it will die when you disconnect one. It WILL run on only 2, but those 2 have to be 4 cylinders apart in the firing order. That's assuming you have a 4.7 V8.
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