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Thread: missing on one cylinder Reply to Thread
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  Topic Review (Newest First)
08-13-2019 11:49 AM
rickaren I had a PO302 error code (#2 cylinder misfire detected) on my 07 Nitro R/T 4.0 engine. It looks like at least for now I corrected my PO302 error code with a simple additive. Chevron Techron Concentrate Plus Fuel System Cleaner - 20 oz. Maybe in my case it was one dirty spark plug or injector? I'm sure if I drove the Nitro more it would not have been an issue.

My R/T is a very low mileage vehicle but lets face it, it is 12 years old and could use replacement of many of what triggers the Nitro to throw this Code including:

Replace Spark Plugs
Replace Spark Plug Wires
Replace Coil Packs
Replace Fuel Injector(s)
Repair Vacuum Leak
Cam or Cam Sensors?
Low Compression?

Don't know how long this low cost simple repair will keep working but it will go to the Dealer since I do have a backup "Lifetime Power train Warranty" if maintenance replacement items don't solve any future error codes. No way am I going to try to figure out myself and repair my Nitro when I might end up like some others with no resolve, just in case it could be a covered engine issue.

Give this a try first as I did and maybe you could solve this issue as I did.

Since the instructions state to add first then fill your gas tank and I already had a full tank I added it anyway and let it set overnight. The next day I started it up and didn't even drive it but let it idle in the driveway for a few hours. I could tell it was not rough idling as before! When I took it for short drives later it appeared to be OK and a few days later I erased the Service Engine Light on the dash with my OBD2 card reader, and it has not come back on!

08-05-2019 11:29 PM
Dodge Nitro Misfire Part 1 (4.0)

Apr 19, 2019
08-03-2019 01:34 PM
Testing Fuel Injectors Fast

04-20-2019 02:02 PM
scoutman77 Looks like cylinder one has one of the rocker arms on backwards.
04-20-2019 10:05 AM
rickaren scoutman77

OK exactly what is broken. Hopefully it is covered by warranty. Nitro is not prone to mechanical engine breakdowns but electrical ones, yes. Thanks for the follow up. Good Luck with the repair.
04-20-2019 08:52 AM
scoutman77 I finally got it taken in to a mechanic, he says there is someth mechanical wrong. Took the valve cover off my remanufactured engine and see this...
11-22-2018 08:28 PM
rickaren Sorry we wern't the help I thought we could be. Maybe you are the first to experience the same issues. If you do find a repair it would be helpful to another if you post your resolve. Good Luck!
11-22-2018 02:48 PM
scoutman77 so, after working on the problem and reworking on the problem, I'm not so sure that it is actually missing, the truck thinks its missing, and after it confirms it shuts off the cylinder, making it miss for real, (not sure that makes sense). the wire has continuity for the injector from the computer. maybe bad cps? I didn't replace that at first when I replaced the engine, only later. I'm about at the end of my abilities. think I may need to take it in to a professional. thanks for all the replies everyone.
10-30-2018 02:56 AM
Bad Injector current ramps.

Oct 29, 2018
2007 Dodge Nitro 3.7L Injector Current Ramps
08-13-2018 01:53 PM
Trouble Codes

The trouble codes are a series of letters and numbers that can help you identify and pinpoint the source of the error message.


Each code begins with a letter. These letters help you identify which system the error is coming from. The meanings of these letters are below:

P: The letter P stands for “Powertrain” and covers the fuel system, engine, transmission, ignition, etc. This contains the largest set of codes.
B: B stands for the “Body” which relates to the seatbelts, airbags, power seating
C: C means “Chassis” and covers everything related to the chassis including the brake fluid, axle, ABS etcetera.
U: U means undefined. These relate to the other aspects of the vehicle.


The letters are followed by a series of 4 numbers. The first number is either 1 or 0. The 0 codes refer to a generic code while the 1 code refers to manufacturer specific code.

The second number refers to the specific subsystem. For example, 7 might mean transmission. Here’s what the other ones mean:

0: Fuel and air metering and auxiliary emission controls
1: Fuel and air metering
2: Fuel and air metering (injector circuit)
3: Ignition system or misfire
4: Auxiliary emissions controls
5: Vehicle speed controls and idle control system
6: Computer output circuit
7: Transmission
8: Transmission

The third and the fourth number refer to the kind of specific problem the code relates to.


Code: P0301.

The P means the problem is from the powertrain section.
The 0 represents a generic code shared by all manufacturers.
The 3 represents the subsystem is the Ignition System.
The 01 represents that the cylinder number 1 has a misfire condition.

This could either mean that the dedicated ignition coil has worn out or the cylinder has suffered a leak.

However, these codes do not tell about the actual problem. Instead, they are like symptoms of these problems. For instance, a wiped out alternator will set off a number of 5 codes in other systems with no problem. It is up to you to make the connections and diagnose the root cause.

How to Use an OBD2 Scanner
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