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  #1  
Old 05-26-2015, 10:19 AM
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2002 grand cherokee misfire and die

Got a 6cyl grand cherokee, was dying once it reached operating temp. Read up a little and saw the crank sensor tends to go and cause this. After replacing the crank sensor it was ok for a few days then started to misfire and die again at op temp. Threw a cel that said cam shaft sensor was bad so I replaced that. It still misses and dies and I can't figure it out. Any one have experience with this?

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  #2  
Old 05-26-2015, 11:55 AM
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Re: 2002 grand cherokee misfire and die

Welcome to the garage.
Did you use MOPAR sensors? Aftermarket sensors are known to give problems.
Does it misfire in all cases, or does it start and run normal when cold? If it really misfires, it should throw a misfire code. Is there any fault code set now?
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Old 05-26-2015, 12:21 PM
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Re: 2002 grand cherokee misfire and die

Did not use mopar sensors, autozone specials. Misfire only happens when it gets warmed up while driving. It threw open circuit misfire codes for most of the cylinders but that only happened after I replaced te crank sensor
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Old 05-26-2015, 03:05 PM
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Re: 2002 grand cherokee misfire and die

Could be a problem with the O2 sensors. If you have a scanner which shows live data, you can see what the O2 readings are (1-1 and 2-1 sensors) and the fuel trim values. If due to an O2 sensor failure it downtrims the fuel too much, you can get lean misfires.
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Old 05-26-2015, 03:05 PM
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Re: 2002 grand cherokee misfire and die

The crank sensors in the 4L can give allot of issue and increase in temp can also increase a bad sensor to give issue more often then when it was cold. Unless you have more information I am to believe the crank sensor is just a cheap malfuntioning unit.
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Old 05-26-2015, 03:38 PM
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Re: 2002 grand cherokee misfire and die

Don't have a way to view live data flow unfortunately
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Old 05-26-2015, 04:26 PM
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Re: 2002 grand cherokee misfire and die

Quote:
Originally Posted by Swederacer850 View Post
Don't have a way to view live data flow unfortunately
If you have an android phone, you could buy a cheap bluetooth dongle and get the free Torque app. With this app you can read and clear fault codes, but also see many live data.
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Old 05-26-2015, 06:32 PM
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Re: 2002 grand cherokee misfire and die

I've got an iPhone, if it was my personal vehicle I'd get all that fancy stuff. Just trying to fix it for a family member. Is there any way of confirming o2 sensor without throwing money at it?
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Old 05-26-2015, 07:04 PM
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Is it throwing any codes?
Try turning key from off to start (Without cranking) about 3-4 times it will show codes where odometer is. They will go by quick might want to write them down.

It sounds kinda like an O2 sensor, that would be a fairly easy/cheap fix If it is.
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Old 05-26-2015, 07:17 PM
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Re: 2002 grand cherokee misfire and die

Good bit of info. Anything else I could check or try?
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Old 05-26-2015, 07:29 PM
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If you pull those codes first you'll have a good start point, just have to look up what they mean.

I never knew my WJ did that, until I took it to advanced auto to get them to pull one, and the guy showed me I could do it on the dash.

Could be a evap issue.
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Old 05-26-2015, 09:29 PM
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Re: 2002 grand cherokee misfire and die

I think the bluetooth adapter or eventually wifi adapter will work on the i-phone as well and most probably Torque is available for the i-phone. Bluetooth adapter is around USD 15 from e-bay. Im not sure if shops like autozone will check live data. Without a scanner, its almost impossible to know if the O2 sensors are working fine. There are some failures which would set a fault code for the O2 sensors, but not all failures.
You could disconnect the upstream O2 sensors (so the 1-1 and 2-1) and see if the misfiring stops. With the O2 sensors disconnected, the PCM will control the fuel injection according a fixed schedule and no trimming will be done (the so called open loop mode). Normally after the engine warms up a bit (or better said, the O2 sensors should heat up enough to work properly), the PCM will control the fuel injection with inputs from the O2 sensors (closed loop mode), and will add or subtract fuel from the fixed schedule.
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