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jtapscot 10-03-2013 11:27 PM

Spark plugs and gas
 
What are the best spark plugs? I have an 05 WK 4.7L V8. Also if anyone could tell me how to change them that'd be awesome.. I looked under the hood but didn't really see anything.

Another thing, I've been using regular 87 gas in my tank. Theres a pamphlet in that came with my jeep that its recommended i use 89 octane... Should I switch to 89???

Bikemobile 10-04-2013 11:31 AM

Re: Spark plugs and gas
 
87 is fine. 89 is reccommended for the hemi.

Use the factory spec bosch or champion plugs from the dealer. Champion was the factory spec inthe early 2000's. I think they switched to bosch in 2005.

You need to remove each coil. They are plugged in. A 10mm bolt holds the coil down. Pull the coils straight up gently. Use a thin wall spark plug socket to remove the plugs. The goin in from the top straight down. Use a dab of anti seize on the plug threads and some dielectric grease on the coil rubbers to maje it easier next time.

LaredoX 10-04-2013 11:55 AM

Re: Spark plugs and gas
 
:thumbsup:STICK WITH OEM!!!
Quote:

Originally Posted by Bikemobile (Post 904070)
87 is fine. 89 is reccommended for the hemi.

Use the factory spec bosch or champion plugs from the dealer. Champion was the factory spec inthe early 2000's. I think they switched to bosch in 2005.

You need to remove each coil. They are plugged in. A 10mm bolt holds the coil down. Pull the coils straight up gently. Use a thin wall spark plug socket to remove the plugs. The goin in from the top straight down. Use a dab of anti seize on the plug threads and some dielectric grease on the coil rubbers to maje it easier next time.


jtapscot 10-04-2013 01:08 PM

Re: Spark plugs and gas
 
Quote:

Originally Posted by Bikemobile (Post 904070)
87 is fine. 89 is reccommended for the hemi.

Use the factory spec bosch or champion plugs from the dealer. Champion was the factory spec inthe early 2000's. I think they switched to bosch in 2005.

You need to remove each coil. They are plugged in. A 10mm bolt holds the coil down. Pull the coils straight up gently. Use a thin wall spark plug socket to remove the plugs. The goin in from the top straight down. Use a dab of anti seize on the plug threads and some dielectric grease on the coil rubbers to maje it easier next time.

I saw some at Autozone they were Champion 439.. is that the same as OEM?

swing4terps 10-04-2013 02:13 PM

Re: Spark plugs and gas
 
Video here. Watch and you should be set.

http://www.jeepgarage.org/f187/how-t...deos-5292.html

TLPMYD 10-04-2013 03:28 PM

Re: Spark plugs and gas
 
i heard some guys going with the NGK laser plugs and love them, anyone on here try them? or is it still champions for the 4.7 wk's?

jtapscot 10-05-2013 12:53 AM

Re: Spark plugs and gas
 
I used the champions. Seemed to work great until my battery completely died right after

Bikemobile 10-06-2013 10:00 AM

Re: Spark plugs and gas
 
Factory spec for your 3.7 is:

Type: ZFR6F-11G (NGK)

Standard resistor-type




OEM P/N SPZFR6F11G


MSRP: $3.70 ea.

.042 in. gap

3/4" reach, 5/8" Hex head

Torque to 20 Ft. lbs.

From WKJeeps.com - 2005-2010 Jeep Grand Cherokee

jtapscot 10-25-2013 11:05 PM

Re: Spark plugs and gas
 
i have a 4.7L

Bikemobile 10-26-2013 02:19 PM

Re: Spark plugs and gas
 
4.7-L V8 (2005-2007)
(standard on Limited, optional on Laredo) 4.7-L V8 (2008-2010)
(standard on Limited, optional on Laredo)

Type: ZFR6F-11G (NGK)

Standard resistor-type




OEM P/N SPZFR6F11G


MSRP: $3.70 ea.

.042 in. gap

3/4" reach, 5/8" Hex head

Torque to 20 Ft. lbs.


Type: RC12MCC4

"Fired in suppressor seal" spark plugs using a copper core ground electrode.



OEM P/N SPRC12MCC4
(formerly 56028236AA)

MSRP: $3.70 ea.


.040 in. gap

3/4" reach, 5/8" Hex head

Torque to 20 Ft. lbs.

(NOTE: The 4.7L V–8 engine is equipped with 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, preignition will result.)

dippinsoldier92 10-27-2013 07:51 AM

Re: Spark plugs and gas
 
I use E3 spark plugs in my 07 3.7 and love em

DAVY27 12-12-2013 08:54 AM

Re: Spark plugs and gas
 
stick with OEM. NGK for my 09.


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