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Old 10-01-2016, 05:28 AM
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Miss fire

Hi all
When I'm driving in my wj when I'm stopped at lights I can sometimes feel and hear a miss fire when I was in the car today I had my obd2 going and I noticed the timing was going up and down is there a self advancing thing in the 4.7

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  #2  
Old 10-01-2016, 03:26 PM
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Re: Miss fire

Ignition timing is controlled by the PCM, using several sensors for input. Like rpm, MAP, TPS, coolant temp and vehicle speed. If there is a real misfire, it should set a code P030X, where the X is the cylinder number, or P0300 for multiple cylinder misfire).
But how are the basics: are the plugs clean and not worn, is the air filter clean?
A dirty fuel injector will disturb the spray pattern and can affect the burn pattern in the cylinder, giving less power then it should. You could try some injector cleaner in the fuel.
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Old 10-01-2016, 07:57 PM
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Re: Miss fire

The only codes I had are
P0141 and p0161
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Old 10-17-2016, 10:59 PM
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Re: Miss fire

After I got my 2000 grand running last year with the 4.7 I noticed it started to sputter sometimes at red lights but going down the highway it was fine. It went on doing this for a few weeks before it finally threw a code. Cylinder 8 misfire so I replaced the #8 coil with a new one and it fixed it up. The spark plugs were new since I just got it running about a month earlier. Have you looked up the definitions on the codes it gave you?? I am not familiar with them codes but there are many things besides an ignition miss that can cause a misfire....
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Old 10-17-2016, 11:11 PM
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Re: Miss fire

Those are O2 sensor codes for the post catalyst sensors. From what I have read in other forums the heater circuit is not functioning properly. If you replace these O2 sensors I strongly recommend OEM. Mopars are finicky when it comes to engine control sensors.
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Old 10-17-2016, 11:20 PM
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Re: Miss fire

I was reading that too I need to get a bunch of sensors . Iit's odd as I swapped out my fuel regulator and it's not so bad but I still get the hard to start
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Old 10-17-2016, 11:33 PM
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I'm having trouble with my 02 WJ with the P0320 issue. Just bought new sensors from O'Reilly and still no go. If it's like my truck Mopars hate aftermarket sensors for whatever reason and I have already spent $70 on sensors. The OE is almost $100 for 1 but gotta do it.
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Old 10-17-2016, 11:43 PM
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Re: Miss fire

Why is it only factory stuff works with our cars
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Old 10-17-2016, 11:52 PM
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Because the PCM requires certain voltage values in sensors in a certain amount of time or at certain temps or speeds or whatever. It does not take much to go beyond the threshold of these parameters. Aftermarket some times just doesn't show the computer what it wants to see and you end up with these frustrating issues. I know it sucks and is expensive. As far as I know the sensors are the only parts that are that picky
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Old 10-17-2016, 11:59 PM
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Re: Miss fire

Ok so any jeep dealer should have the parts or would I need to shop on the mopar site
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Old 10-18-2016, 12:06 AM
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Dodge Jeep Chrysler. They are all members of the great Mopar family. You can usually find the parts at any dealer because the share a lot of the same parts. I work as a technician and if you just don't want to tackle it on your own, they have specialized equipment to diagnose your vehicle or and old timer that has seen that problem a thousand times. Just to keep in mind.
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Old 10-18-2016, 12:37 AM
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Re: Miss fire

Ok cool I'll take it back to jeep and see if they can fix it this time
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