Heat soak only on specific temperature and up days - JeepForum.com
 
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post #1 of 14 Old 03-19-2020, 06:14 PM Thread Starter
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Heat soak only on specific temperature and up days

So today was 81 65. First day it overheated since winter. I've driven it exaxrly the same over winter and it's over heating again.

The over heat bust through the 3rd spark plug (which is stripped) then to the 02 sensor. I replaced the coil pack worn 30k spark plugs that showed overheating at the 30k with 100k Bosch double iridium.

Not sure if the whole engine block is going bad.

Any guesses? It wasn't overheating while the 30ks were fresh.

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post #2 of 14 Old 03-19-2020, 06:17 PM Thread Starter
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Some more info it ends up pulling a P0303.

Unsure if maybe a coolant issue maybe I need to buy an aluminum radiator? But I replaced it and its still overheating. Replaced thermostat and housing.

So it sounds like a temperature sensitive issue.
Maybe the head is temperature sensitive maybe replace that? Maybe performance the exhaust system? Something has to be heat damaged and HEAT VULNERABLE maybe.
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post #3 of 14 Old 03-20-2020, 04:54 AM
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Might want to post what vehicle year motor etc...
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post #4 of 14 Old 03-20-2020, 05:02 AM
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As mentioned tell us what model, year, engine, transmission.

Post all codes.
describe issue - no start, wont run, stalls, no power, hard to start when warm...etc.

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #5 of 14 Old 03-20-2020, 10:55 AM Thread Starter
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Jeep 2002 4.0L 5spd
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post #6 of 14 Old 03-20-2020, 01:36 PM
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Normal operating temperature for the 4.0L is ~210F; what temperature are you seeing when it overheats?
Have you verified your coolant is topped off and you don't have air in the system?
Is your radiator fan working correctly?
Is anything blocking the airflow through the radiator?
Does the overheat issue occur when stopped, while driving at speed, or both?

Is the #3 spark plug stripped or is it the threads in the cylinder head that are stripped?
Are you only getting a P0303 fault code and does the same code return the very next time you drive the Jeep after clearing the code?

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post #7 of 14 Old 03-20-2020, 05:51 PM Thread Starter
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Normal operating temperature for the 4.0L is ~210F; what temperature are you seeing when it overheats?
- that picture of the gauge is over what it should be.

Have you verified your coolant is topped off and you don't have air in the system?
- coolant is good. Idk about air in system no issues on cold days

Is your radiator fan working correctly?
Is anything blocking the airflow through the radiator?
- fan had a little play. I might try to install a new clutch fan I read that has helped before. Just installed a new radiator.

Does the overheat issue occur when stopped, while driving at speed, or both?
- driving only on hot days when its over 80 outside. Not when idle.

Is the #3 spark plug stripped or is it the threads in the cylinder head that are stripped?
Are you only getting a P0303 fault code and does the same code return the very next time you drive the Jeep after clearing the code?

- yes the P0303 repeats.

The issue is I like to beat on it a little. The cold weather never over heats. Sounds like conflagration issue.
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post #8 of 14 Old 03-20-2020, 05:52 PM Thread Starter
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Quote:
Originally Posted by mukluk View Post
Normal operating temperature for the 4.0L is ~210F; what temperature are you seeing when it overheats?
Have you verified your coolant is topped off and you don't have air in the system?
Is your radiator fan working correctly?
Is anything blocking the airflow through the radiator?
Does the overheat issue occur when stopped, while driving at speed, or both?

Is the #3 spark plug stripped or is it the threads in the cylinder head that are stripped?
Are you only getting a P0303 fault code and does the same code return the very next time you drive the Jeep after clearing the code?
It's the threads in cylinder head. So it's not screwed in there properly.
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post #9 of 14 Old 03-20-2020, 06:00 PM Thread Starter
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Quote:
Originally Posted by mukluk View Post
Normal operating temperature for the 4.0L is ~210F; what temperature are you seeing when it overheats?
Have you verified your coolant is topped off and you don't have air in the system?
Is your radiator fan working correctly?
Is anything blocking the airflow through the radiator?
Does the overheat issue occur when stopped, while driving at speed, or both?

Is the #3 spark plug stripped or is it the threads in the cylinder head that are stripped?
Are you only getting a P0303 fault code and does the same code return the very next time you drive the Jeep after clearing the code?
You know I think it's the stripped cylinder head hole maybe?
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post #10 of 14 Old 03-20-2020, 07:14 PM
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Quote:
Originally Posted by UnXplored View Post
Normal operating temperature for the 4.0L is ~210F; what temperature are you seeing when it overheats?
- that picture of the gauge is over what it should be.
The temperature shown in your picture would still be considered normal. Overheat is when it gets to the red or at least past the white mark just to the left of the red. If your gauge isn't getting near the red, you're not overheating.

The threads in the head being stripped means you can't properly torque the sparkplug in place, which means you're losing some compression on that cylinder. That can easily be the source of your #3 cylinder misfire problem.

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post #11 of 14 Old 03-21-2020, 01:43 PM Thread Starter
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Quote:
Originally Posted by mukluk View Post
Quote:
Originally Posted by UnXplored View Post
Normal operating temperature for the 4.0L is ~210F; what temperature are you seeing when it overheats?
- that picture of the gauge is over what it should be.
The temperature shown in your picture would still be considered normal. Overheat is when it gets to the red or at least past the white mark just to the left of the red. If your gauge isn't getting near the red, you're not overheating.

The threads in the head being stripped means you can't properly torque the sparkplug in place, which means you're losing some compression on that cylinder. That can easily be the source of your #3 cylinder misfire problem.
Does rethreading actually work?
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post #12 of 14 Old 03-21-2020, 03:02 PM
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To fix the stripped threads in the cylinder head you'll want to install a threaded insert. A heli-coil or better yet a time-sert would do the trick.

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post #13 of 14 Old 03-22-2020, 05:15 PM Thread Starter
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Quote:
Originally Posted by mukluk View Post
To fix the stripped threads in the cylinder head you'll want to install a threaded insert. A heli-coil or better yet a time-sert would do the trick.
Is that reliable?
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post #14 of 14 Old 03-22-2020, 10:06 PM
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A time-sert would be my preference for fixing the existing cylinder head; it is a reliable and long term solution. The head will need to come off to do a proper job of it, so this would also be a good time to have it checked for flatness and cracks. If you're having to pay somebody else to do the cylinder head removal, inspection, machine work, threaded insert, and reinstall on the Jeep, you may be better off buying a whole replacement head.

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