2003 4.7 V8 Tune Up ie spark plugs & coils - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > ZJ Grand Cherokee Forum > 2003 4.7 V8 Tune Up ie spark plugs & coils

FS: Wranger BRIGHT License Plate LED! Just $3! Great valueXHD Heavy-Duty Hood Latches for JK and TJ available at OcoStainless Steel Door Hinge Pins

Reply
Unread 05-14-2009, 05:57 AM   #1
marciad32
Registered User
2003 WJ 
 
Join Date: Feb 2009
Location: Michigan
Posts: 65
2003 4.7 V8 Tune Up ie spark plugs & coils

Hi, I have some questions and any replies would be appreciated. My jeep recently had a 04 engine put in and I really do need a tune up. So from my readings I see that champions are most popular I just want to confrim that. Is there a certain champion or whatever one they give me at Autozone. Next, should I replace all of the ignition coils since I am doing the sparkplugs or can I replace just one? My fiance noticed a small crack in one so I am not sure if one can be replaced or all. Also, when should these be replaced? the truck has 108,000 miles on it and it always seems to run kinda rough and has an annoying tick to it that drives me nuts. Any help would be appreciated.

marciad32 is offline   Reply With Quote
Unread 05-14-2009, 12:31 PM   #2
(OllllO)
Registered User
2000 WJ 
 
Join Date: Sep 2005
Posts: 61
There is probably a tag under the hood that tells you what plug to use, if not call your local dealer and they can tell you or Autozone can tell you when you pick them up. The ticking is not from sparkplugs though, you could have a exhaust leak, lifter noise ect... It's possible to put some rvt glue on the crack in the coil but if you can afford it I would just change it for a new one. The running rough could be other things too like sparkplug wires, rotor and cap, dirty throttle body ect... you might want to have a mechanic look at it so your not just throwing parts at it. I hear Jegs has a complete tune up kit that it probably wouldn't hurt to do anyway for around $100.
(OllllO) is offline   Reply With Quote
Unread 05-14-2009, 12:45 PM   #3
skain8
Under Construction
 
skain8's Avatar
2002 WJ 
 
Join Date: Oct 2004
Location: Reading, PA
Posts: 3,532
I'd stick with mopar plugs. For whatever reason, the 4.7L is a bit finicky when it comes to plugs.
__________________
Tom

'02 WJ: 4.7L, 5", HP44/9", 231HD, tall & skinny KM2's
'99 XJ: stock
'99 XJ: stolen
'06 XK: sold
231HD build guide
skain8 is online now   Reply With Quote
Unread 05-14-2009, 01:25 PM   #4
crashcraddock
Registered User
2000 WJ 
 
Join Date: Mar 2009
Location: Moore, OK
Posts: 402
My 4.7 just got E3 plugs, and it LOVES them, $6.99 apiece though. Horsepower TV did a test with them and they got more horsepower using less fuel. This may be on the E3 website or the Horsepower TV website.
crashcraddock is offline   Reply With Quote
Unread 05-14-2009, 02:25 PM   #5
QUADRADRIVE
Registered User
2002 WJ 
 
Join Date: Apr 2009
Location: ARLINGTON
Posts: 18
Did you get the 4.7 of 4.7HO. I think all Overlands have the 4.7HO. This is from wjjeeps.com:

4.7 Plug: MoparŪ P/N SPRC12MCC4 Gap: 0.040


CAUTION: The standard 4.7L engine uses copper core ground electrode spark plugs, they must be replaced with the same type/number spark plug as the original. If another spark plug is substituted, pre-ignition will result.


4.7 HO Plug: MoparŪ P/N SPRC7PYCB4* Gap: 0.040


CAUTION: Never substitute the original platinum tipped HO spark plug with a different part number. Serious engine damage may result.. HO plugs cannot be cleaned, damage to the platinum rivet will result. Also, do not use a wire-type gapping tool for the same reason. Use a tapered-type gauge. To prevent possible pre-ignition and/or mechanical engine damage, the correct type/heat range/number spark plug must be used.
*NOTE on 4.7 HO plugs: Champion RC7PYCB4 (p/n 3340) is the same as Mopar SPRC7PYCB4 and can be purchased for a fraction of the cost that Mopar charges.
__________________
2002 WJ OVERLAND
4.7L V8 QUADRADRIVE
QUADRADRIVE is offline   Reply With Quote
Unread 05-14-2009, 03:09 PM   #6
Haleyrz
Registered User
1998 ZJ 
 
Join Date: Oct 2008
Location: Spokane, WA
Posts: 2,729
i'm confused......why do you have a 2003 XJ Cherokee? Do you mean a 2003 WJ Grand Cherokee? Also look into the NGK plugs. I think they are around the same price as the E3's crashcraddock suggested. I'd suggest investing in some good wires like NGK or Bosch, etc. They will resist more frequency. In cheap wires the radio waves from other electrical components such as the radio can interfere with the wires causing hesitation, missfire, etc.
__________________
1998 ZJ Laredo, 4.0L, 2WD "Band Van", Current
1997 XJ, 4.0L, 30x9.50 Maxxis Bighorns, super 44, Sold
2003 WJ Overland, 4.7L HO V8, 6000K HID's, Sold
1996 ZJ Laredo, 5.2L V8, 3" Kolak exhaust, K&N FIPK, 4300K HID's, Sold

http://www.facebook.com/home.php#/pr...27&ref=profile
Haleyrz is offline   Reply With Quote
Unread 05-14-2009, 03:13 PM   #7
QUADRADRIVE
Registered User
2002 WJ 
 
Join Date: Apr 2009
Location: ARLINGTON
Posts: 18
My 2002 4.7HO does not have wires. Use the Platinum for the 4.7HO.
__________________
2002 WJ OVERLAND
4.7L V8 QUADRADRIVE
QUADRADRIVE is offline   Reply With Quote
Unread 05-14-2009, 04:46 PM   #8
rm2001wj
Web Wheeler
 
rm2001wj's Avatar
2001 WJ 
 
Join Date: Aug 2005
Location: Memphis, TN
Posts: 3,083
The factory plug as mentioned above is
Quote:
4.7 Plug: MoparŪ P/N SPRC12MCC4 Gap: 0.040
That plug is made by Champion and and has the Champion designation RC12MCC4. That's the plug to use. Also buy only a single coil to replace the one with the crack; on a 4.7, replacing coils is not a routine maintenance procedure.
__________________
2001 WJ Limited with Quadra-Drive, Kenne Bell Supercharger, 3-inch Kolak exhaust, Stillen rotors (F/R) and MM pads, Addco sway bars (F/R).
rm2001wj is offline   Reply With Quote
Unread 05-21-2009, 09:19 AM   #9
marciad32
Registered User
2003 WJ 
 
Join Date: Feb 2009
Location: Michigan
Posts: 65
I went to Autozone and they gave me a RC12MCC4 as a replacement spark plug. I am assuming these are wrong.
marciad32 is offline   Reply With Quote
Unread 05-21-2009, 09:23 AM   #10
xJoshxx
Web Wheeler
 
xJoshxx's Avatar
2012 WK 
 
Join Date: Sep 2008
Location: Burlington, Kentucky
Posts: 5,501
Quote:
Originally Posted by marciad32 View Post
I went to Autozone and they gave me a RC12MCC4 as a replacement spark plug. I am assuming these are wrong.
no that's factory plug.
__________________
Interested in Amsoil? Sold4" Hybrid lift TeraFlex coils IRO Adjustable LA's Jks tracbar 1.25spidertrax spacers 265/75/16 Dura-tracs
Quote:
Originally Posted by moPowered View Post
The SRt-8's are a liberty design.
2011 WK2 ORA2
2012 WK2 SRT8
xJoshxx is offline   Reply With Quote
Unread 05-21-2009, 09:41 AM   #11
marciad32
Registered User
2003 WJ 
 
Join Date: Feb 2009
Location: Michigan
Posts: 65
I called a jeep dealership and they said that part number is for a normal 4.7 not a 4.7 HO they agree'd w/above post RC7PYCB4.
marciad32 is offline   Reply With Quote
Unread 05-21-2009, 09:52 AM   #12
bradbb2005
Member
 
bradbb2005's Avatar
2008 WK 
 
Join Date: Dec 2007
Location: Plattsburgh, NY, NY
Posts: 437
Quote:
Originally Posted by (OllllO) View Post
The running rough could be other things too like sparkplug wires, rotor and cap
if the 4.7 had them, maybe....

Check for engine codes i had some misfire issues with mine but i ran lots of seafoam through and it seemed to do the trick...
__________________
Current:
2008 WK Limited 5.7L HEMI
Mods: None, Yet

2008 KK 3.7L V6
Mods: None, Yet

Past: 1996 XJ 4.0 I6, 1998 ZJ 4.0 I6, 2001 WJ 4.7 V8, 2005 KJ Renegade 3.7 V6
bradbb2005 is offline   Reply With Quote
Unread 05-30-2009, 01:57 PM   #13
marciad32
Registered User
2003 WJ 
 
Join Date: Feb 2009
Location: Michigan
Posts: 65
Spark plugs changed and 1 ignition coil high idle now

The idle is very high. Now what ? Any ideas??
marciad32 is offline   Reply With Quote
Unread 05-30-2009, 04:27 PM   #14
rm2001wj
Web Wheeler
 
rm2001wj's Avatar
2001 WJ 
 
Join Date: Aug 2005
Location: Memphis, TN
Posts: 3,083
What plugs did you install? A high idle speed is somewhat subjective; numerically, what is your idle speed?

Maybe the PCM needs to be reset. Disconnect the positive battery cable, turn the key to the start position and hold for about 20 seconds. Hook the cable back up.
rm2001wj is offline   Reply With Quote
Unread 06-03-2009, 06:20 AM   #15
marciad32
Registered User
2003 WJ 
 
Join Date: Feb 2009
Location: Michigan
Posts: 65
I can't remember the number now but they were champion's and it was the number that I got from the dealer. He finally got the idle to normal but we found a vaccum leak. The only thing is i am not sure how to describe to you where that leak is. Its at the top closer to drive side. He put some starter fluid on it and it sucked it right in. Any clue what I mean without me know the actual name for it.
marciad32 is offline   Reply With Quote
Reply
Thread Tools


Suggested Threads





Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.