Misfires Related to New Flex Plate?
#1
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Year: 2000
Model: Cherokee
Engine: 4.0
Misfires Related to New Flex Plate?
Mechanic changed the flexplate on my 2000 XJ last Thursday.
Truck has 137k miles and Jasper motor has 59k.
Saturday it started to throw misfire codes p0301 and po303 first.
Cleared them - the truck did not seem to be actually misfiring.
Two hours later codes for misfires cyl 1, 6 and random.
Cleared them and drove prob 50 miles on Sun - no codes.
Monday, today, heading to work got codes for misfires cyl 1,and 6 and random.
As this never happened before and now the truck has a new Jeep OEM flex plate, I can only assume that these things are related.... a buddy menti9oned something about the ECM having to "relearn" things related to the new flexplate.
Any input before I call the mechanic back??
Thanks.
Here's the cracked flexplate
Truck has 137k miles and Jasper motor has 59k.
Saturday it started to throw misfire codes p0301 and po303 first.
Cleared them - the truck did not seem to be actually misfiring.
Two hours later codes for misfires cyl 1, 6 and random.
Cleared them and drove prob 50 miles on Sun - no codes.
Monday, today, heading to work got codes for misfires cyl 1,and 6 and random.
As this never happened before and now the truck has a new Jeep OEM flex plate, I can only assume that these things are related.... a buddy menti9oned something about the ECM having to "relearn" things related to the new flexplate.
Any input before I call the mechanic back??
Thanks.
Here's the cracked flexplate
Last edited by MACherokee; 06-02-2014 at 09:03 AM.
#2
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Join Date: Sep 2012
Location: West of Boston
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Year: 2000
Model: Cherokee
Engine: 4.0
Mechanic changed the flexplate on my 2000 XJ last Thursday.
Truck has 137k miles and Jasper motor has 59k.
Saturday it started to throw misfire codes p0301 and po303 first.
Cleared them - the truck did not seem to be actually misfiring.
Two hours later codes for misfires cyl 1, 6 and random.
Cleared them and drove prob 50 miles on Sun - no codes.
Monday, today, heading to work got codes for misfires cyl 1,and 6 and random.
As this never happened before and now the truck has a new Jeep OEM flex plate, I can only assume that these things are related.... a buddy menti9oned something about the ECM having to "relearn" things related to the new flexplate.
Here's the cracked flexplate
Truck has 137k miles and Jasper motor has 59k.
Saturday it started to throw misfire codes p0301 and po303 first.
Cleared them - the truck did not seem to be actually misfiring.
Two hours later codes for misfires cyl 1, 6 and random.
Cleared them and drove prob 50 miles on Sun - no codes.
Monday, today, heading to work got codes for misfires cyl 1,and 6 and random.
As this never happened before and now the truck has a new Jeep OEM flex plate, I can only assume that these things are related.... a buddy menti9oned something about the ECM having to "relearn" things related to the new flexplate.
Here's the cracked flexplate
#3
CF Veteran
That method appears to be correct.
But have you ever experienced any actual misfires? Or is it just the codes coming up?
So many misfires from multiple/random cylinders, should be felt I'd reckon...
But have you ever experienced any actual misfires? Or is it just the codes coming up?
So many misfires from multiple/random cylinders, should be felt I'd reckon...
#4
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Year: 2000
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Just don't like to see the codes pop up... then I just have to clear em....
Works fine since the adaptive memory cleared though!!
#5
CF Veteran
Let us know if it returns. Might be worth looking into doing a tune-up (good maintenance anyway if not done recently), to have fresh parts and benchmark.
#6
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