Dodge Nitro: Changing Plugs 4.0L - Dodge Nitro Forum
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post #1 of 22 (permalink) Old 11-12-2017, 11:49 AM Thread Starter
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Dodge Nitro: Changing Plugs 4.0L

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Changing Nitro Plugs 4.0L

I have attempted in separating "Changing Nitro Plugs 3.7 & 4.0L" into two THREADS. One for each engine type, since there are differences mainly the requirement of removing the intake manifold on the 4.0L (R/T) engine to end any confusion. I did not remove the posts concerning the 4.0 engine from the original thread but did mark them in RED.

Hopefully this will help.

Rick

Nitro Year: 2007 (1 of 91,815 sold in 07)
Nitro Model: R/T 4X4 Stone White
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post #2 of 22 (permalink) Old 11-12-2017, 12:01 PM Thread Starter
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Quote:
Originally Posted by Don47 View Post
I can't locate th spark plugs in my 2007 Nitro to replace them and what plugs are best?
I too have a 2007 Nitro (R/T) and have read they do not need to be replaced till 100,000 miles! Check your Owners Manual.

Rick

Nitro Year: 2007 (1 of 91,815 sold in 07)
Nitro Model: R/T 4X4 Stone White
CAT-BACK Exhaust, CAI, Projector Head Lamps
Fully-Equipped w/all factory options
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post #3 of 22 (permalink) Old 11-12-2017, 12:03 PM Thread Starter
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I could not find any detailed pictures or instructions for replacing plugs on the Nitro 4.0L but I managed to figure it out. Here are some pics and information that may help others.

Overall list of tools used: Ratchet with 6/3/1" extensions, 8/10mm sockets and plug socket, 13mm open/box wrench, pliers, flashlight, shop towels, minimal cursing.

To replace the plugs you will have to remove the entire intake manifold on top of the engine:

1. Remove the four (4) hoses on the passenger side, one has two bolts holding it in. 8mm socket used for these

2. Remove the four (4) bolts holding the throttle? assembly on the front passenger side of the manifold. 10mm socket used for these

3. Remove the four (4) bolts holding the assembly to the right of the throttle? and disconnect electrical connection. Watch out for the O-ring inside as it will fall out easily. 10mm socket used for these.

4. Remove the two (2) nuts on the drivers side of the manifold that are towards the bottom, move the hanger out of the way and then remove the two (2) copper nut/bolts as well. 13mm box/open wrench used for these.

5. Fully loosen the seven (7) long bolts along the center top of the manifold. The rear most bolt is very tight fit, I used a 1" socket extension for this one as the socket on the ratchet was to short and anything else was to long. 10mm socket used for these.

Pictures listed below. More in part 2.

Cy
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Rick

Nitro Year: 2007 (1 of 91,815 sold in 07)
Nitro Model: R/T 4X4 Stone White
CAT-BACK Exhaust, CAI, Projector Head Lamps
Fully-Equipped w/all factory options
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post #4 of 22 (permalink) Old 11-12-2017, 12:10 PM Thread Starter
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Rick

Nitro Year: 2007 (1 of 91,815 sold in 07)
Nitro Model: R/T 4X4 Stone White
CAT-BACK Exhaust, CAI, Projector Head Lamps
Fully-Equipped w/all factory options
rickaren is offline  
post #5 of 22 (permalink) Old 11-12-2017, 12:13 PM Thread Starter
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Continuing from part 1:

6. When all hoses and nuts/bolts are loosened and removed you can carefully remove the intake. You will have to wiggle it around a bit to slip it free and watch the metal hose on the passenger side as it slides into the manifold about 3-4"s (also watch this when mounting the manifold when done).

7. When the manifold is gone it is now very easy to reach the plugs and do the swap. Just disconnect the electrical wires, remove the retaining bolt on the coil and slip the coil out of the well. Then use an extension and plug socket to remove the plugs one by one.

8. Use thread lub and dielectric grease in the boots as desired. Carefully insert the new plugs guarding against cross-threading.

9. Reverse all steps to re-assemble all components.

10. After double checking everything during the rebuild reconnect the negative battery terminal and start motor. Check for leaks or any dash codes/lights. Take for a test drive and enjoy!

It took me quite a while to complete this project as it was all new to me and I had to make a couple of runs to Lowes for additional tools. I'd say it took about 3.5 hours going slowly and having to figure some things out.

Cy








Rick

Nitro Year: 2007 (1 of 91,815 sold in 07)
Nitro Model: R/T 4X4 Stone White
CAT-BACK Exhaust, CAI, Projector Head Lamps
Fully-Equipped w/all factory options
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post #6 of 22 (permalink) Old 11-12-2017, 12:18 PM Thread Starter
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Rick

Nitro Year: 2007 (1 of 91,815 sold in 07)
Nitro Model: R/T 4X4 Stone White
CAT-BACK Exhaust, CAI, Projector Head Lamps
Fully-Equipped w/all factory options
rickaren is offline  
post #7 of 22 (permalink) Old 11-12-2017, 12:21 PM Thread Starter
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Great Job Again Cyklopz!

You are not changing your plugs already are you? Read they should last 100,000 miles!

Rick

Nitro Year: 2007 (1 of 91,815 sold in 07)
Nitro Model: R/T 4X4 Stone White
CAT-BACK Exhaust, CAI, Projector Head Lamps
Fully-Equipped w/all factory options
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post #8 of 22 (permalink) Old 11-12-2017, 12:22 PM Thread Starter
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Rick,

I did but just because I wanted to upgrade to higher performance plugs over stock. The new Bosch seem to be running great so far.

Cy

Rick

Nitro Year: 2007 (1 of 91,815 sold in 07)
Nitro Model: R/T 4X4 Stone White
CAT-BACK Exhaust, CAI, Projector Head Lamps
Fully-Equipped w/all factory options
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post #9 of 22 (permalink) Old 11-12-2017, 12:26 PM Thread Starter
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Best spark plugs for 4.0 engine?
Hey guys,

I just recently changed my spark plugs on my 2007 Nitro R/T 4.0 with 77k miles on it because the engine was a little sluggish. I installed Bosch Platinum +4 plugs and it seems like my MPG went down...from 18.6 to 17.7 average (this is in 2 days of regular driving to and from work). I will be going on a road trip this weekend which will total about 2500 miles. I will keep you guys posted on the mileage. (PS, to the effect of the engine being sluggish, the new plugs seem to give it its power back).

To my question...has anyone had any experience with any other spark plugs other than stock? I am looking at NGK Iridium IX plugs and also Autolite Iridium plugs. From reading some other forums the E3 Diamond Fire plugs seem to kill MPGs as well. Any feedback would be great!!!

Thanks in advance.
Paul

Rick

Nitro Year: 2007 (1 of 91,815 sold in 07)
Nitro Model: R/T 4X4 Stone White
CAT-BACK Exhaust, CAI, Projector Head Lamps
Fully-Equipped w/all factory options
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post #10 of 22 (permalink) Old 11-12-2017, 12:28 PM Thread Starter
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spark plug specs for 2011 4.0 ltr nitro ?
Is there a spec for the plug gap on a nitro 4.0 ltr plug ???

Rick

Nitro Year: 2007 (1 of 91,815 sold in 07)
Nitro Model: R/T 4X4 Stone White
CAT-BACK Exhaust, CAI, Projector Head Lamps
Fully-Equipped w/all factory options
rickaren is offline  
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