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Discussion Starter #1
long story short, I replaced everything a/c related under the hood. in doing so, I broke the o-ring on the radiator plug so that when it was ran, lost all antifreeze and overheated. When it overheated, I dropped a valve seat. ended up replacing entire engine with a rebuilt one. now since replacing the engine I get a missfire on cylinder one. only cylinder one. I have replaced cam shaft sensor, crankshaft sensor, new spark plugs, new coils, new injector, the only things not new on this engine are the intake and throttle, and map sensor. swapped everything between cylinders, miss stayed on number one. noid light was flashing in injector connector but seemed weak. so used multi meter to check voltage and was less than 1 volt with key on but not started. replaced ecm as the last resort. went from having a solid cel to having just a pending p0301. but I can still feel it's missing. I think I have done everything the other posts here have suggested with no results, any insights would be greatly appreciated.
 

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Welcome scoutman77

Sorry to hear about all your issues! So are you still receiving an error code (PO301) and is that the one and only code you have? Since you have read most of our posts I suppose you have reset the Nitro computer, too. I know it seems far-fetched but how about your battery? They can go bad and cause all kinds of problems.


Dodge Nitro :Battery issues?


If you are only showing the PO301 error code is that what we need to focus on only to address and get your Nitro back to 100%?

Let us know and see what we can come up with. Good Luck!
 

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Sounds like you have already checked out the Nitro Service Manual posted here. I don't find anything of help that you must not have already reviewed. Maybe it is really something like a defective new part. I was a Parts Manager for Chrysler years ago and I have seen it all. Going to keep looking as you have. Please check back. If you had a good Chrysler Dealership nearby I would pay for them to check out the issue for a flat fee and give you a Quote to what they would do to correct your Nitro issue. Problem is they might not know either and after paying you would find they were wrong.


Dodge Nitro ENGINE 3.7L - Service InformationENGINE




MISSES ON ACCELERATION
1. Spark plugs dirty
or incorrectly
gapped.
1. (Refer to
SPARK
PLUG ).

2. Dirt in fuel
system.
2. Clean fuel
system.

3. Burned, warped
or pitted valves.

3. Replace as
necessary.

4. Faulty coil.
4. Refer to

ENGINE MISSES
AT HIGH SPEED


1. Spark plugs dirty
or incorrectly gapped.
1. (Refer to
SPARK
PLUG ).

2. Faulty coil.
2. Refer to REMOVAL
.
3. Dirt or water in
fuel system.
3. Clean system and
replace fuel filter.
 

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How about Faulty O2 (Oxygen) Sensors


In order to figure out if the check engine light code P0301 (misfire on cylinder 1) is being caused by a fuel injector, you can (in most cases) just switch it with a different cylinder. ... You can use it with spark plug wires, ignition coils (assuming you have a coil for each cylinder), spark plugs, etc.

What Causes a P0301 Code?

Spark Plugs and Wires
Fuel Injectors
Internal Engine Problems such as Low Compression, etc.

Less Common Causes

Faulty Computer
Coil or Coil Packs
Crank or Cam sensors or reluctor wheels
Faulty O2 (Oxygen) Sensors

LINK

Oxygen sensor

Still looking
 

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Discussion Starter #7
I don't think the wire (y/br) has continuity to the computer, ohm meter shows infinite resistance. is it possible? and could I try to splice a jumper in to check? btw already swapped everything miss stayed on one.
 

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I don't think the wire (y/br) has continuity to the computer, ohm meter shows infinite resistance. is it possible? and could I try to splice a jumper in to check? btw already swapped everything miss stayed on one.
The reason I sent the WIRING DIAGRAMS is I remember reading where an issue concerning a fuel injector WAS CAUSED BY WIRING. That owner had thought it must have been a defective part and replaced it again, but still had the same issue. When you finally figure out what is causing this error code (you have really done your homework) please report back to help other Nitro owners in the future. Thanks and Good Luck again.
 

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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.

Letters:

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.

Number:


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.

Examples:

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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Bad Injector current ramps.


Oct 29, 2018
2007 Dodge Nitro 3.7L Injector Current Ramps
 

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Discussion Starter #11
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.
 

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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!
 

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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.
 

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Testing Fuel Injectors Fast

 

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Dodge Nitro Misfire Part 1 (4.0)




Apr 19, 2019
 

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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!

GOOD LUCK!
 
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