Check engine light no codes
01-28-2012, 09:24 AM
#16
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Year: 1993
Model: Cherokee
Engine: 4.0
[QUOTE=KD3NE;1494328]
If so I thought that was indicative of a somewhat serious misfire condition?
I'm not certain but I think I read that one some threads here before.
^^^^ GM does that. It's flash city if you break a spark plug wire or any other misfire condition
If so I thought that was indicative of a somewhat serious misfire condition?
I'm not certain but I think I read that one some threads here before.
^^^^ GM does that. It's flash city if you break a spark plug wire or any other misfire condition
01-28-2012, 12:43 PM
#17
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Year: 99 94
Model: Cherokee (XJ)
Engine: I6
Originally Posted by KD3NE
Is it FLASHING as in " going off and on " with a steady rate when the problem occurs?
If so I thought that was indicative of a somewhat serious misfire condition?
I'm not certain but I think I read that one some threads here before.
You might want to read codes when it is having the problem, or gain access to a code reader/scanner that can record data as the engine is running and take it for a drive while recording the data.
02-08-2012, 11:30 PM
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Year: 99 94
Model: Cherokee (XJ)
Engine: I6
It's amazing what new spark plug wires and plugs can do. Jerking when pressing gas has stopped. Hesitation and backfire when accelerating has stopped. The idle sounds more powerful and you can feel how much less you press the gas pedal at any speed.
We go all tecky to the "Nth" degree, and it sounds like it was the plug gap! 
.. 
Gonna need to remember this one.
12-25-2020, 09:49 PM
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Mr
I would clean the IAC valve and test the TPS. The pintle on the IAC gets dirty and can affect the idle. The TPS is best tested with an analog VOM on the resistance scale should show smooth movement as you move the throttle from closed to wide open. (engine off)
Also, the pre-cat oxygen sensor could need replaced. It can affect idle and overall rpms as well.
Also, the pre-cat oxygen sensor could need replaced. It can affect idle and overall rpms as well.
I have a 2007 Cherokee Laredo cannot get the codes by turning key on and off three times does not show no codes how do I get to it don't even have a button to reset the mileage button does not have cannot find how to get codes anyone got any answers
Last edited by Phillip Earles; 12-25-2020 at 09:53 PM.
12-26-2020, 01:59 AM
#21
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Year: 1999
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Similar issue
I would clean the IAC valve and test the TPS. The pintle on the IAC gets dirty and can affect the idle. The TPS is best tested with an analog VOM on the resistance scale should show smooth movement as you move the throttle from closed to wide open. (engine off)
Also, the pre-cat oxygen sensor could need replaced. It can affect idle and overall rpms as well.
Also, the pre-cat oxygen sensor could need replaced. It can affect idle and overall rpms as well.
12-26-2020, 07:05 PM
#22
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Year: 1989
Model: Comanche (MJ)
Engine: 4.0
what is all these codes mean and what is the purpose what do they stand for
I have a 2007 Cherokee Laredo cannot get the codes by turning key on and off three times does not show no codes how do I get to it don't even have a button to reset the mileage button does not have cannot find how to get codes anyone got any answers
I have a 2007 Cherokee Laredo cannot get the codes by turning key on and off three times does not show no codes how do I get to it don't even have a button to reset the mileage button does not have cannot find how to get codes anyone got any answers
That said, you will need to buy an OBDII code reader and connect it to the diagnostic connector under the dash to pull codes, which you can google.
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