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Trying to find out what's wrong with my jeep

Customer Question
Trying to find out what's wrong with my jeep
Submitted: 2 years ago.Category: Jeep
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Answered in 5 minutes by:
10/30/2015
Jeep Mechanic: AZTechBrian, ASE Certified Technician replied 2 years ago
AZTechBrian
AZTechBrian, ASE Certified Technician
Category: Jeep
Satisfied Customers: 732
Experience: Owner
Verified

What is it doing?

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Customer reply replied 2 years ago
Missing while idling and driving while warming up for about 30 seconds it will go into a really rough idle and cut off. I've replaced spark plugs, spark plugs, csp, and everything I can think
Jeep Mechanic: AZTechBrian, ASE Certified Technician replied 2 years ago

It misses at idle. Ok.

If you bring the RPM up, does it continue to misfire? or does it smooth out?

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Customer reply replied 2 years ago
Smooth out
Customer reply replied 2 years ago
It misses while I'm driving up hills especially
Jeep Mechanic: AZTechBrian, ASE Certified Technician replied 2 years ago

Ok. Do you have access to a vacuum pump, like a mity vac? Are there any stored trouble codes? is it a 4 or 6 cylinder?

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Customer reply replied 2 years ago
No I don't. I just changed the coil pack like 30 minutes ago and there was a check engine light before I disconnected the battery
Customer reply replied 2 years ago
4.0
Jeep Mechanic: AZTechBrian, ASE Certified Technician replied 2 years ago

Ok. I really need to know what the code is in order to have a better idea of what is happening here. I suspect the code will appear again very soon, if it's not already there as a pending code. Can you check for pending codes?

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Customer reply replied 2 years ago
as of right now there is no codes
Jeep Mechanic: AZTechBrian, ASE Certified Technician replied 2 years ago

Not even pending? Pending codes wont light up the CEL. Did you happen to check it before you disconnected the battery?

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Customer reply replied 2 years ago
The codes I had was loss or intermittent signal from ckp or csp. I also had a code from the coil pack and misfires before I changed the spark plugs
Customer reply replied 2 years ago
The code reader has a yellow light on it but there is no stored codes
Jeep Mechanic: AZTechBrian, ASE Certified Technician replied 2 years ago

It probably has pending codes in it. They will mature soon.

It had both cam and crank sensor codes before?

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Customer reply replied 2 years ago
Intermittent signals yes.
Jeep Mechanic: AZTechBrian, ASE Certified Technician replied 2 years ago

Do you recall the code number?

Have you inspected the crankshaft sensor connector well? crank sensors are not uncommon failures on those jeeps.

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Customer reply replied 2 years ago
Maybe 303 and 302 not real sure
Customer reply replied 2 years ago
It looks like it's not plugged in all the way but the jeep won't run if it's not plugged all the way in right?
Jeep Mechanic: AZTechBrian, ASE Certified Technician replied 2 years ago

It shouldn't, but it may be making contact, just not very good contact. Try plugging it in good and see what we get

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Customer reply replied 2 years ago
Same thing
Jeep Mechanic: AZTechBrian, ASE Certified Technician replied 2 years ago

Ok. Without a code, there are too many possibilities as to why it could be giving you these symptoms. Did you say that your scan tool indicated that there was a code, but would not display it yet?

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Customer reply replied 2 years ago
It has 3 status lights green yellow red and it's yellow when I plug it in and try to pull codes.
Jeep Mechanic: AZTechBrian, ASE Certified Technician replied 2 years ago

Ok. I assume that yellow means that there are pending fault codes and red means there are current fault codes. It will not allow you to review pending fault codes?

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Customer reply replied 2 years ago
No it wont
Jeep Mechanic: AZTechBrian, ASE Certified Technician replied 2 years ago

how long ago did you disconnect the battery and clear the codes? I am wondering if you drive it around the block if it will give us the code so we can proceed with troubleshooting this issue

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Customer reply replied 2 years ago
When I changed the coil pack. I just drove it around the block and no CEL or codes
Jeep Mechanic: AZTechBrian, ASE Certified Technician replied 2 years ago

it may take a couple drive cycles to display the code. It is definitely seeing a problem which i assume is why the light is yellow. Unless the yellow light indicates that the monitors have not run. I am not familiar with your scan tool. I have to get going for the day, so if you want I can opt out so somebody else can help you, or you can try to get the code to display and we can proceed tomorrow. it's totally up to you.

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Customer reply replied 2 years ago
Ok thanks for your help
Jeep Mechanic: Jack, ASE Certified Technician replied 2 years ago
Jack
Jack, ASE Certified Technician
Category: Jeep
Satisfied Customers: 52
Experience: Chrysler Master Certified
Verified

Hello and thanks for your guestion.. I will do my best to give you sound advice based on the information you provide. like it was stated before a code would be very helpful in this situation to help rule possible issues. on these 4 liter engines I have seen plenty of these kind of issues caused my the PCM. this is just based off of what I have read so far. check over the PCM and check for any corrosion along the seams mainly at the bottom. also check yout 5 volt refference at the cam and crank sensor (if you can). I would also recommend to drive it and hopefully the code will set again.

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Customer reply replied 2 years ago
The code I'm getting p1391
Jeep Mechanic: Jack, ASE Certified Technician replied 2 years ago

Check the cam sensor for correct index, check cam sensor adapter assembly for a seized or binding can sensor shaft. Inspect the can position sensor drive gear for damage. If the cam position sensor drive gear is damaged, remove the oil pan and oil pump, inspect the camshaft drive gear for damage as well.

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Customer reply replied 2 years ago
How do I check for correct index?
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Jack
Jack
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