I know, I know this has been brought up numerous times, but... - Jeep Commander Forums: Jeep Commander Forum
Problems / Dealer Service Having a problem with your vehicle? Were you treated fairly or poorly at a dealer? Warranty issues? Let us know.

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post #1 of 20 (permalink) Old 05-01-2019, 03:54 PM Thread Starter
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Join Date: Apr 2013
Location: Massachusetts
Own a Commander?: Yes
Model year: 2008
Trim Package: Sport
Power-Train: 3.7L V-6
4WD
If 4WD - system: QT-I
Current Mileage: 103000
Posts: 48
Angry I know, I know this has been brought up numerous times, but...

Searching through forum after forum, thread after thread but not sure what to do.


First, I have a 2008 Commander Sport 3.7L with 103k miles.


Ive been wracking my brain trying to figure out this issue. A few months ago, my TPS, Airbag & Check Engine light were all on. I was able to get the airbag light to go out by checking/cleaning all connections under the seats and replaced the fuses which seemed a bit corroded. All air pressure is fine so I assume the TPS light is due to a faulty TPS valve.


I am getting a P0300 code (random misfire) but no cylinder code. I'll drive the Jeep and it will be fine. I'll go to drive it again shortly afterwards it will through the check engine light and run really rough. Lately it now seems to be sluggish and then all of a sudden the power will kick in. Someone posted on another forum that he noticed it seemed to shift between gears alot especially going up hills. Never thought much about it but mine does as well. I usually manually downshift it a gear to keep some power but driving through the hills of Vermont last year I really noticed it had no power. Sometimes I will also smell gasoline but it goes away.


Things I have done:
- Put new NGK Iridium spark plugs
- Replaced all coil packs

- Tested the battery
- Replaced a broken ground strap ( the one that attaches to the exhaust, frame and transmission,)
- Cleaned electrical connections
- Replaced transmission coolant lines and had a dealer check the fluid level
- Recently changed out the Iridium plugs for the original copper plugs. In doing so, I noticed I didnt tighten the plugs down as much as I should have. I blew compressed air into the holes to remove any dirt as recommended by the service manual. When I did that to cylinder 3, some oil came splashing back up at me.


- Known fixes, but not sure where to start:


- Air Intake sensor
- Mass Air meter sensor
- Throttle position sensor
- Crankshaft position sensor
- Camshaft position sensor
- Oxygen sensors
- Fuel pressure
- Vacuum leak
- Fuel injectors
- New PCM

- And so on.....


I didnt know if someone should suggest where to start since its semi intermittent and seems to be more when Ive driven it and it starts when i go to drive it again shortly afterwards.



Confused and fed up with this issue.

Mark Snowdon
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post #2 of 20 (permalink) Old 05-01-2019, 08:37 PM
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Join Date: Oct 2015
Location: East Coast of Florida
Own a Commander?: Yes
Model year: 2008
Trim Package: Sport
Power-Train: 4.7L V-8
4WD
If 4WD - system: QT-II
Current Mileage: 101,200
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@msnowdon; I can't help you much with the P0300 code short of advising you to go to a shop or dealer with a real OBD-II scanner and have all the DTC's pulled along with the information that comes with them and see what that tells you; This thread my point you in the right direction;

https://www.jeepcommander.com/forums...m-misfire.html

The TPM sensor can be triggered by more than just low tire pressure; the individual TPM sensors all have their own self-contained batteries and if the battery dies, that sensor can no longer check in with the TPM system and will trigger that annoying orange light to go off; I honestly don't know off-hand if the batteries can be replaced or not; If not, the TPM sensors themselves are pretty cheap and you can pick them up off of amazon or e-bay, I believe Doorman is the company that makes them and there are probably others. You also have a TPM sensor in the spare tire - which a lot of people seem to overlook when trying to troubleshoot their TPM sensor system.

As far as the constant downshifting, that's probably due to your Hill Start Assist / Hill Descent Control assuming that you have this feature and I believe almost all of the different XK trim packages do regardless of the power-train you have; If you question whether you have this feature or not, it would be listed on your factory build sheet - if you don't have one, I can tell you how to get one, it's easy enough. If your Hill Start Assist is on, you will tend to downshift much more often, particularly if you are towing under load. You can do away with the excessive down-shifting by just turning it off; If you go to your EVIC and toggle through all of your personal settings, when you come to the correct sub-menu, you will have an option to just turn it on or off by pressing the buttons on your steering wheel like you would do to change any other setting in your personal settings menu.


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Last edited by Big Blue; 05-01-2019 at 08:49 PM.
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post #3 of 20 (permalink) Old 05-02-2019, 12:16 AM
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Join Date: Jun 2013
Location: California
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TPS and airbag lights are typical on these Jeeps, and I wouldn't be concerned about those at all. Even just a water bottle rolling under a seat and touching an airbag harness is enough to set the airbag light off.

The P0300, rough running, lack of power, and downshifting all are consistent with an engine problem, though I'm sure your transmission service didn't hurt. An intermittent misfire typically does lead to a gasoline scent, so that's consistent as well.

Unfortunately, a P0300 is tough to diagnose; engines don't typically have a way of knowing whether combustion is happening in a given cylinder apart from feedback from the spark plug and injector. This means that you could be having a misfire in a specific cylinder, but the computer has no way of knowing which cylinder so it throws a P0300.

I'd start by running an injector cleaner through your gas tank and looking for a vacuum leak if you've got the tools. Obviously you've got spark sorted out, and typically I'd expect to see more codes if a sensor was having problems, so I'd start with the basics and make sure you've got good fuel and air supplies. You can also read the spark plugs to see if there's an obvious problem cylinder; given the oil in cylinder 3, you may want to start there.

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post #4 of 20 (permalink) Old 05-02-2019, 08:15 AM Thread Starter
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Join Date: Apr 2013
Location: Massachusetts
Own a Commander?: Yes
Model year: 2008
Trim Package: Sport
Power-Train: 3.7L V-6
4WD
If 4WD - system: QT-I
Current Mileage: 103000
Posts: 48
A couple of more questions:


If I disconnect the harness to the mass air intake sensor while it is running, wouldnt I notice a change in the idle? It made no effect what so ever.


Also, is checking the battery voltage with a multi-meter tool enough or is there a more extensive test? Weird thing I noticed is that I get corrosion on the positive post only. Never the negative post.


Thanks


Mark

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post #5 of 20 (permalink) Old 05-02-2019, 08:37 AM
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Join Date: Oct 2015
Location: East Coast of Florida
Own a Commander?: Yes
Model year: 2008
Trim Package: Sport
Power-Train: 4.7L V-8
4WD
If 4WD - system: QT-II
Current Mileage: 101,200
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Quote:
Originally Posted by msnowdon View Post
A couple of more questions:


If I disconnect the harness to the mass air intake sensor while it is running, wouldnt I notice a change in the idle? It made no effect what so ever.


Also, is checking the battery voltage with a multi-meter tool enough or is there a more extensive test? Weird thing I noticed is that I get corrosion on the positive post only. Never the negative post.


Thanks


Mark
You can drive to any Auto-Zone or Advance Auto Parts and they will test your battery for free.


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Last edited by Big Blue; 05-02-2019 at 09:43 AM.
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post #6 of 20 (permalink) Old 05-02-2019, 12:57 PM Thread Starter
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Join Date: Apr 2013
Location: Massachusetts
Own a Commander?: Yes
Model year: 2008
Trim Package: Sport
Power-Train: 3.7L V-6
4WD
If 4WD - system: QT-I
Current Mileage: 103000
Posts: 48
"As far as the constant downshifting, that's probably due to your Hill Start Assist / Hill Descent Control assuming that you have this feature and I believe almost all of the different XK trim packages do regardless of the power-train you have; If you question whether you have this feature or not, it would be listed on your factory build sheet -"


Hi Big Blue,


I went through the EVIC and Equipment Listing Sheet. My vehicle doesnt seem to have Hill Start Assist/Hill Descent Control. It does have Electronic Stability Control, Four Wheel Traction Control & Speed Control. Looks like Im one control short

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post #7 of 20 (permalink) Old 05-02-2019, 01:59 PM
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Join Date: Jun 2013
Location: California
Own a Commander?: Yes
Model year: 2006
Trim Package: Limited
Power-Train: 5.7L V-8 Hemi
4WD
If 4WD - system: QD-II
Current Mileage: 175,000
Posts: 478
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Quote:
Originally Posted by msnowdon View Post
If I disconnect the harness to the mass air intake sensor while it is running, wouldnt I notice a change in the idle? It made no effect what so ever.

Also, is checking the battery voltage with a multi-meter tool enough or is there a more extensive test? Weird thing I noticed is that I get corrosion on the positive post only. Never the negative post.
In theory, disconnecting the sensor should kill the engine if it's functioning properly. If you can disconnect it with no changes, then the computer is likely not getting a good reading from it and is substituting preprogrammed values instead. However, I'm no expert on the 3.7, so I'm just going off my experience with other engines.

As far as checking the battery, you probably should get it tested at an auto parts store. A multimeter can tell you the voltage which is great for checking things like the alternator or detecting a battery that won't hold any charge, but you won't typically see something like a dead cell.

2006 XK Limited, Hemi, QDII
245/70R17 General Grabber AT2s
Ported/Polished Throttle Body
Flowmaster Super 44
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post #8 of 20 (permalink) Old 05-02-2019, 02:20 PM Thread Starter
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Join Date: Apr 2013
Location: Massachusetts
Own a Commander?: Yes
Model year: 2008
Trim Package: Sport
Power-Train: 3.7L V-6
4WD
If 4WD - system: QT-I
Current Mileage: 103000
Posts: 48
Quote:
Originally Posted by consumedbywater View Post
In theory, disconnecting the sensor should kill the engine if it's functioning properly. If you can disconnect it with no changes, then the computer is likely not getting a good reading from it and is substituting preprogrammed values instead. However, I'm no expert on the 3.7, so I'm just going off my experience with other engines.

As far as checking the battery, you probably should get it tested at an auto parts store. A multimeter can tell you the voltage which is great for checking things like the alternator or detecting a battery that won't hold any charge, but you won't typically see something like a dead cell.

Went I went home for lunch today, I was looking through the EVIC for that hill assist option Big Blue mentioned. Anyway I noticed it did give the P0113 code from disconnecting the IAT while running this morning even though I didnt notice any idle change.



I'll have to get the battery tested like you both suggested. I dont know if its true or not but I read a post somewhere that if it has a bad cell, it will have corrosion on the positive post which mine does. Nothing on the negative post.


My daughter's battery went bad just over 3 years old. It was a Diehard Gold. I was pissed to find out they dont prorate anything for at least up to 5 years. Only a 3 year warranty and then you are out of luck. Batteries used to last at least 5 years. Anyway, I was going to put an Optima or one of the new AGM type batteries in but they are all over $200. I know only a few companies actually manufacture batteries so I shopped around. I ended up buying one from Walmart. Not only was it less expensive, it had more CCA and carried a 3 year full replacement + 2 year prorated (5 year warranty) which is better than any of the Diehards now.



I wont buy another Diehard again. With Sears closing so many of its stores, it would be a pain to get it unless you get it from Amazon.com anyway.

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post #9 of 20 (permalink) Old 05-05-2019, 01:45 PM
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Join Date: Oct 2015
Location: East Coast of Florida
Own a Commander?: Yes
Model year: 2008
Trim Package: Sport
Power-Train: 4.7L V-8
4WD
If 4WD - system: QT-II
Current Mileage: 101,200
Posts: 5,320
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Quote:
Originally Posted by msnowdon View Post
Went I went home for lunch today, I was looking through the EVIC for that hill assist option Big Blue mentioned. Anyway I noticed it did give the P0113 code from disconnecting the IAT while running this morning even though I didnt notice any idle change.

I'll have to get the battery tested like you both suggested. I dont know if its true or not but I read a post somewhere that if it has a bad cell, it will have corrosion on the positive post which mine does. Nothing on the negative post.

My daughter's battery went bad just over 3 years old. It was a Diehard Gold. I was pissed to find out they dont prorate anything for at least up to 5 years. Only a 3 year warranty and then you are out of luck. Batteries used to last at least 5 years. Anyway, I was going to put an Optima or one of the new AGM type batteries in but they are all over $200. I know only a few companies actually manufacture batteries so I shopped around. I ended up buying one from Walmart. Not only was it less expensive, it had more CCA and carried a 3 year full replacement + 2 year prorated (5 year warranty) which is better than any of the Diehards now.



I wont buy another Diehard again. With Sears closing so many of its stores, it would be a pain to get it unless you get it from Amazon.com anyway.
Corrosion is merely an indicator; It doesn't necessarily have to have corrosion on the positive terminal to have a bad cell.

I'd definitely get that battery tested, sooner rather than later.


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post #10 of 20 (permalink) Old 05-29-2019, 07:32 AM Thread Starter
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Join Date: Apr 2013
Location: Massachusetts
Own a Commander?: Yes
Model year: 2008
Trim Package: Sport
Power-Train: 3.7L V-6
4WD
If 4WD - system: QT-I
Current Mileage: 103000
Posts: 48
Quote:
Originally Posted by Big Blue View Post
Corrosion is merely an indicator; It doesn't necessarily have to have corrosion on the positive terminal to have a bad cell.

I'd definitely get that battery tested, sooner rather than later.

I did have the battery tested. It tested fine.


I replaced the ambient air sensor, the IAT sensor and the MAP sensor. I also got new Mopar O2 sensors. Took a look at what Im dealing with. Two seem easy to get to. The other 2, not so much. While I was inspecting them, I sprayed them with penetrating oil.



I just saw your link to the diagnostic software you purchased. It came up in yesterdays email summary. From the quick look I gave it, it looks better than what Im using. May also invest in a new code scanner. My current OBDII scanner is a Forseal Wi-Fi scanner.

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