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cuemark8 06-01-2008 02:48 PM

NGK Iridium Plugs
I now have 34,000 mi. on my Compass 4X2 5-speed, have not had it a year. I mostly have all highway mileage. I'm car pooling with one other person my fuel economy is seldom less than 30mpg! I have the EVIC, I think it's very accurate the lowest I have seen it dip anytime recently was a momentary reading of 28.8 traveling over a mountain top. It bounced right back when heading down the other side. My mileage right now according to the EVIC is 31.8. I have checked it a fill-ups. I still get routinely around 31 Mpg. The last tank full I that calculated I went 414 miles on the tank full!
I will say I have the K&N cold air intake kit. I use nothing but synthetic motor oil and I changed the stock NGK sparkplugs at 30,000 as stated in the owners manual. I switched to the NGK Iridium sparkplugs. This all does help to get the most from the engine.

Gramps 06-04-2008 05:10 PM


Originally Posted by cuemark8 (Post 5286127)
I will say I have the K&N cold air intake kit. I use nothing but synthetic motor oil and I changed the stock NGK sparkplugs at 30,000 as stated in the owners manual. I switched to the NGK Iridium sparkplugs. This all does help to get the most from the engine.

I haven't been able to find the part # for the NGK Iridiums. Do you have it handy?

cuemark8 06-05-2008 11:41 AM

NGK Iridium sparkplugs
Gramps might want to move this thread. This is in reply to Bob. The torque values and gap are Chrysler specs from the factory service manual.

Stock sparkplug NGK ZFR5F-11
Iridium sparkplug NGK ZFR5FIX-11 or simply 2477
Gap for either is .043"
Torque sparkplugs to 13ft-lbs. + or - 2ft-lbs.

NGK also has a platium sparkplug available for that as a cross reference. Not sure the part #. NGK just recently switched to a four digit product # to simplify cataloging parts. Simply use NGK sparkplug #2477. Any of those sparkplugs should be fairly easy to obtain. Many Honda vehicles from the early to late 90's use that exact sparkplug including the Civic, DelSol, Accord, and Prelude to name a few. Sparkplugs are sold in packs of 4. I paid just over $8 apiece.

Gramps 06-05-2008 05:40 PM

Thanks for the info. I am switching over to Amsoil and wanted to get everything through them. They handle NGK but don't show a listing, neither did NAPA or even I don't know what's up with that but I really appreciate the feedback! :thumbsup:


petbug 09-27-2008 02:35 PM

NGK iridiums

I have just changed my plugs for NGK ZFR5FIX-11 and also my oil to Mobil1 5W-20 (Ansoil was not as easy to find). My Pat has only 5,500KM on it, but I wanted to improve my mileage. Guess what? No change, if anything it is worse and I swear power is down in 2,000-3,500 range. Any suggestions? Perhaps the trick with battery disconnect may re-set something, or is it a myth? Help anyone!

Gramps 09-27-2008 03:40 PM

I noticed my mileage slooowly dropping off around 30K miles (48,280 kilometers) so I changed the air filter and went with Autolite AP5224 a "single stage platinum plug. I did disconnect the battery and on restart it went up to about 24 1/2 mpg on my EVIC but then continued to slowly drop and after checking with a few fill ups my mpg was dropping down to 19 at the lowest check. Also at this same time my cruise control was acting up intermittently.

I was getting ready to head down to Tennessee for the Worlds Longest Yard Sale, way over loaded, and before we left I did the battery disconnect trick and it went back up to about 24 1/2 again, no time to go to the dealer so we left on the trip. My mileage dropped off about 0.1 mpg about every 50 miles or so. While there and hitting all of the yard sales, back and forth, idling with the A/C on (very hot and humid the first 2 days) mileage hit the worst ever at 17 mpg but I was sitting still ALOT so I didn't expect it to do to well. Before we started back home I disconnected the battery, right back up to 24 1.2 and then slowly dropped like before.

I've had mine in twice for the cruise control and it will work for a few days and quit. The first time they replaced the switch only and the second time they replaced the switch, clock spring and the air bag because of a note in their manuals about an early production date using a superseded clock spring.

I did experiment a few times with pulling over and restarting my Jeep and sometimes it reset and the cruise worked again and other times not (mostly not). To me it seems like when I start it that the computers aren't reading that there is cruise control installed. Absolutely no indication on the dash when you push the button to turn it on. It has also turned off by itself while driving along with it engaged. I have a strange feeling that there is either a poor electrical connection, TCM or ECM going bad.

Back to gas mileage. It has stabilized at just shy of 23 mpg, a little less than it used to be. I have changed over to Amsoil mostly for the longer change intervals, no mileage increase on mine but the Wife's Grand has gone up 2mpg. You can find a local Amsoil dealer in larger areas but I use the website and became a preferred customer (cheap) since I have 3 and sometimes more cars to take care of.

I was holding off on reporting this until I found a fix but it is still eluding me.

Tuksonrider 09-29-2008 01:22 PM

Sorry if this is a bit off-topic, but... what's a "Clock Spring" and it's function?


Gramps 09-29-2008 05:53 PM

The clockspring is under the air bag in the steering wheel and allows the steering wheel to be turned 360+ and still keep the connection to the electrical components. This includes the horn, radio buttons, cruise control, and airbag. If anyone of these don't function or if more than one does not function your clockspring may be to blame. Most of the time the srs light will come on but only a dealer can scan for this to see if it is in fact your clockspring.

Tuksonrider 09-29-2008 08:04 PM

Thanks! That's really good to know.

The reason I asked was that I installed a mopar Speed Control in my '08 Patriot. It works fine, and everything else seems to work fine, but now I get the Engine MIL on my dash. I have no idea what it could be, but I may have to take it into the dealership. I just won't mention that I installed a cruise control.

I somewhat mechanically inclined. Enough to get myself in trouble, I guess. On the bright side, the speed control works perfectly!

Oh, to keep it on topic, I just ordered 4x E3 spark plugs. Should be arriving tomorrow. Hopefully that goes well without a hitch. *crosses fingers*

Zappy 10-01-2008 12:03 PM

Gramps, it sounds like you're describing almost exactly the problems that I had after I changed over my plugs back around 30K miles with the drop in the mileage down from the slightly over 24mpg down to roughly 20mpg or so. The mileage still isnt back to where it was before that oil/ air filter/plug change.

Like you, I haven't been able to figure out what would cause that sudden drop in mileage. The only thing I can think of so far would be that intermittent issue I've got going with with the flow control valve actuator that I still have to find the time to get in and get replaced. I was getting the drop in the mileage though before that problem manifested itself, so I'm not too sure about that being the culprit.:confused:

petbug 10-03-2008 02:03 AM

Tuksonrider can you please report on your mileage after you put in E3 plugs? Tks

Tuksonrider 10-03-2008 02:35 PM

Sure thing. I'm taking a 1600mi road trip next week. Granted, most will be highway miles.

Also (sorry if a bit off topic), my Engine light went off on it's own. I don't know what that was about, but it's not lighting anymore (except of the bulb check when I first turn the ignition key).

Tuksonrider 10-30-2008 01:08 PM

Okay, got the milege.

2008 Patriot 5-spd manual. "D" package
Speed Control
E3 Spark Plugs
K&N Drop-in Filter
OIL: 0w-30 Mobil1
Bug deflector (don't know about wind resistance, but helps a ton against bug splatters).
Avg speed = 78mph
AC running about 95% of the time

1551 miles (85% highway miles), used 54.61gal (according to reciepts) = 28.4mpg

It seems pretty avg. honestly for this vehicle. Still, 28mpg for a small suv is nice. :) The trip was very comfortable. 2 adults, 1 child and enough baggage for a week.

Argent33 10-30-2008 01:22 PM

Must be the change in final drive gear ratios between the 07's and the 08's cause I'm happy when I get 24 mpg :P and I don't consider myself a leadfoot

PirateKatz 01-05-2009 12:07 PM

Spark plugs @ 30,000 miles?
I'm going to take my 2008 Jeep Compass into the shop next week for its 30,000 mile service. I noticed that according to the manual, the spark plugs should be replaced at this time.

Please excuse my auto ignorance but why do they have to be changed so early? My previous cars all went significantly longer before this was recommended in the manual.


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