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  #1  
Old 09-23-2014, 08:12 PM
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Tune Up

New (to me) 2005 5.7l Grand Cherokee Limited. It's getting real shitty gas mileage... driven 160 miles & am at just over 1/4 tank. Granted it's been mostly in-town driving, but I've been driving it real easy. It has 121,000 miles & I figured I'd start with a tune up, not having any service records from the previous owner.

I've done some research & think I've got a complete list, but wanted to make sure I'm not missing anything.

1. Oil (5-20 Mobil 1 Synthetic)
2. K&N Oil Filter
3. Air Filter
4. Plugs (NGK V-Groove Copper Core/ Nickel Plated... 16 of em)
5. Plug Wires (Taylor 8mm)
6. New MAP sensor

I planned on checking the throttle body blade & cleaning it up. Seafoam makes an intake cleaning system that I've used on my Volvo & Chevy... works real well. I'm also looking at doing the Oil Catch Can mod to help keep the intake clean.

Any other ideas? Anything I'm missing?

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  #2  
Old 09-23-2014, 09:30 PM
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Re: Tune Up

Quote:
Originally Posted by Furyous68 View Post
New (to me) 2005 5.7l Grand Cherokee Limited. It's getting real shitty gas mileage... driven 160 miles & am at just over 1/4 tank. Granted it's been mostly in-town driving, but I've been driving it real easy. It has 121,000 miles & I figured I'd start with a tune up, not having any service records from the previous owner.

I've done some research & think I've got a complete list, but wanted to make sure I'm not missing anything.

1. Oil (5-20 Mobil 1 Synthetic)
2. K&N Oil Filter
3. Air Filter
4. Plugs (NGK V-Groove Copper Core/ Nickel Plated... 16 of em)
5. Plug Wires (Taylor 8mm)
6. New MAP sensor

I planned on checking the throttle body blade & cleaning it up. Seafoam makes an intake cleaning system that I've used on my Volvo & Chevy... works real well. I'm also looking at doing the Oil Catch Can mod to help keep the intake clean.

Any other ideas? Anything I'm missing?
Looks like you're off to a good start.
1. Good choice
2. Or a Mobil 1 oil filter.
3. Consider a K & N or Trueflow filter element
4. Good choice. Be sure to torque them properly and DO NOT use anti-seize on new plugs. On used plugs, a little dab will do you. Also, while you have the plugs out, consider just removing one per cylinder first and do a compression check so you'll get a good idea where you stand with overall engine condition. Pull the fuel pump relay first.
5. Good Choice

Definitely get the catch can.

If the above items doesn't heal the fuel economy, change the O2 Sensors. With that many miles it's very probable that they are not working like they should. They wear out similar in fashion to spark plugs. You may not notice they're bad until your fuel economy tanks. If you end up changing them, get only NTK (OEM)......No. 23160 for pre-cat, and 23159 for post-cat.

Since this vehicle is new to you, I'd recommend doing a complete service, to include changing all fluids/filters....differentials, Xfer case, transmission. I just did the 90K service on mine and the fluids/filters alone will run you around $300. Consider replacing the coolant too, as it should be changed at 100K, or sooner. Use only HOAT compatible stuff. Also, check the brakes, and have the front suspension/alignment/tire balance checked. You're at the mileage where things start failing, unless the vehicle has previously received lots of TLC.

Good luck, and let us know how it goes.
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Old 09-23-2014, 09:49 PM
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Re: Tune Up

Thanks for the info.

Changing all the fluids is next on my list. This jeep does seem to be in great condition. Good idea on the compression check. The engine has good throttle response, and I only have the P0700 code showing (Transmission Control Module). The suspension feels firm & tight. I don't see any evidence of leaks underneath. The diff covers are dry (unless it all leaked out ). Brakes are good, but not good enough. I'm going to get some power slots & ceramic pads for it. My DD is a 2005 Volvo S60R w/ Brembo's... I'm used to stopping quick!

This truck will rarely be put off road. I do live by Pismo Beach, CA... so it will go on the beach from time to time to keep the 4x4 equipment from drying up.
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Old 09-29-2014, 10:54 PM
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Re: Tune Up

Adding a couple other items to my list:

EGR Valve
PCV Valve

Anyone know if it matters whether or not the MAP sensor has a flange? There are two options listed. One has a flange w/ what looks like 2 bolt holes. The other has no flange Can't see very well which one I have. A lot of shit on these engines.. not nearly as easy as my 68 Plymouth.
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Old 09-30-2014, 10:17 AM
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Re: Tune Up

You're right, not as easy (or fun) as the old iron. Your early Hemi uses the MAP Sensor without the bolt hole....if you can actually get one. The one with the bolt hole is for the later models, but is interchangeable (with a little work) and is normally the only one you can get anymore. I guess, by now, some of the aftermarket folks may be making both though. Do a search on changing the MAP Sensor, and you'll see what needs to be done. Basically, it requires breaking a tab off the intake. It's a bit of a pain, because of the location. On the PCV Valve, be careful that you don't break the old on off in its housing. It has been done, especially on vehicles that haven't had it changed in a long time....or ever.
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05 LX/RT & 06 WK/GCO, modded similarly, MDS "ON" Light, Vortex Gens, Debadged, DashHawk, BT Catch Can, SRT CAI W/Add Air Inlet, K&N Filter, Sonnax Trans Press Booster, SC Tuner W/Adv Trans Tuning App, DS Tuner, Cust tube headers w/3 in. catback, Bilsteins, SRT frt/rear bumpers, Eibach SRT Lwr Sprgs & Sways, FRI Sidewinder Cam Adv 2*, 6.1 valvetrain, SLP 25% UD Pulley, BBK 90mm TB, SOS Coils/.060 plug gaps. 20 in. SRT Reps.
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  #6  
Old 09-30-2014, 10:43 AM
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Re: Tune Up

Quote:
Originally Posted by Furyous68 View Post
New (to me) 2005 5.7l Grand Cherokee Limited. It's getting real shitty gas mileage... driven 160 miles & am at just over 1/4 tank. Granted it's been mostly in-town driving, but I've been driving it real easy. It has 121,000 miles & I figured I'd start with a tune up, not having any service records from the previous owner.

I've done some research & think I've got a complete list, but wanted to make sure I'm not missing anything.

1. Oil (5-20 Mobil 1 Synthetic)
2. K&N Oil Filter
3. Air Filter
4. Plugs (NGK V-Groove Copper Core/ Nickel Plated... 16 of em)
5. Plug Wires (Taylor 8mm)
6. New MAP sensor

I planned on checking the throttle body blade & cleaning it up. Seafoam makes an intake cleaning system that I've used on my Volvo & Chevy... works real well. I'm also looking at doing the Oil Catch Can mod to help keep the intake clean.

Any other ideas? Anything I'm missing?
That's like 10-12 mpg...possible but below what it should be unless you are racer rick.....check your O2 sensors. If they aren't throwing codes they can still be carboned up. Since they are pricey try this on all four. I know it ain't fun and you have to be careful not to break them but trust me it works. Did on my '02 4.7.

Remove them and spray the screen end liberally with contact cleaner. That will clean off alot of the carbon and not damage them. Then when you re-install do yourself a favor and use anti-seize on the threads for next time.

Also, use a good injector cleaner in your next tank and monthly for a while, bet yours are spraying like poo...that'll roach mileage...any rough idle or seeming like a possible cylinder miss? dirty injectors sometimes present that way too...
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Old 09-30-2014, 11:41 AM
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Re: Tune Up

With up to date maintenance and a few easy mods, I get 22.5 mpg at 65 mph, and have 105k on the OD. Remove the TB from the vehicle and clean every bit of black everywhere, not just the plate. I used rubbing alcohol with rags and q tips for crevices. Takes time but well worth the effort, and never have to do it again with a catch can installed. Also undo the battery neg terminal while doing this to reset the ECU.
Definitely do the Seafoam crankcase treatment, put 1/2 bottle in the oil, and run for 100-150 miles, (don't race the engine either) then change oil. This works great and loosens up the stuck MS lifters, (the cause of the Hemi tick) greatly improves throttle response and improves mpg. I've done this every oil change since 50k.
Do the EGR, but do not follow the how to instructions on this forum. It is very easy to do. Just remove the top EGR bolt, wiggle to loosen it up, then rotate the EGR down to the left and voila, the lower bolt is out in the open and easy to get to and remove. No cutting, alternator, belt removal, etc.....
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Old 09-30-2014, 11:42 AM
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Re: Tune Up

Quote:
Originally Posted by jeepgcoman View Post
On the PCV Valve, be careful that you don't break the old on off in its housing. It has been done, especially on vehicles that haven't had it changed in a long time....or ever.
Thanks jeepgcoman, I plan on soaking the EGR bolts w/ PB Blaster and letting it sit over night before I attempt.. remember... I have "Old Iron" too, and it rusts . Though, by now, I've pretty much replaced everything on that engine & don't need to worry about it too much.

Edit- just noticed you said "PCV" valve... not EGR. Any tips for the PCV valve?

14summithemi: I just ordered new O2 sensors. Weren't too pricey through Roch Auto & Summit. NGK sensors. Both were less than $35 ea. They're about $100 a piece for my Volvo, so it wasn't too bad.
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Old 09-30-2014, 11:49 AM
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Re: Tune Up

Quote:
Originally Posted by dmsfun View Post
With up to date maintenance and a few easy mods, I get 22.5 mpg at 65 mph, and have 105k on the OD. Remove the TB from the vehicle and clean every bit of black everywhere, not just the plate. I used rubbing alcohol with rags and q tips for crevices. Takes time but well worth the effort, and never have to do it again with a catch can installed. Also undo the battery neg terminal while doing this to reset the ECU.
Definitely do the Seafoam crankcase treatment, put 1/2 bottle in the oil, and run for 100-150 miles, (don't race the engine either) then change oil. This works great and loosens up the stuck MS lifters, (the cause of the Hemi tick) greatly improves throttle response and improves mpg. I've done this every oil change since 50k.
Do the EGR, but do not follow the how to instructions on this forum. It is very easy to do. Just remove the top EGR bolt, wiggle to loosen it up, then rotate the EGR down to the left and voila, the lower bolt is out in the open and easy to get to and remove. No cutting, alternator, belt removal, etc.....
Thanks for the tip on the EGR valve. I have a bottle of Seafoam ready to use. I think cleaning the throttle body is probably the right way to go. This jeep doesn't have a catch can, and I doubt anyone has paid any attention to the blade in any of the 121,000 miles it has. It's probably pretty crappy in there. I wonder if I should just replace the whole thing & start fresh.
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Old 09-30-2014, 12:02 PM
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Re: Tune Up

Quote:
Originally Posted by Furyous68 View Post
Thanks for the tip on the EGR valve. I have a bottle of Seafoam ready to use. I think cleaning the throttle body is probably the right way to go. This jeep doesn't have a catch can, and I doubt anyone has paid any attention to the blade in any of the 121,000 miles it has. It's probably pretty crappy in there. I wonder if I should just replace the whole thing & start fresh.

Yup, and I would spend just a little more and get the Modern Muscle 85 mm ported TB, (new OEM TB with CNC taper porting) and install while doing the Catch can. This TB improves tip in throttle response with much better drivability, as I did direct comparisons to a cleaned stock TB. For air filter, I buy the fram extra guard, higher flow versus stock, and cost 10 bucks at Meijer, so I just replace them every oil change.
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Old 09-30-2014, 12:07 PM
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If you want her to sound bad arse throw on the K&N FITPK....amazing sound, but your mpg will suffer do to the need to "hear" that sound every time you start off
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Old 09-30-2014, 12:23 PM
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Re: Tune Up

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Originally Posted by 14SummitHemi View Post
If you want her to sound bad arse throw on the K&N FITPK....amazing sound, but your mpg will suffer do to the need to "hear" that sound every time you start off
Umm, sorry but I respectfully disagree. Been there done that with the CAI, and so glad to be rid of it. The noise is LOUD and unpleasant, not sweet Hemi sound, plus the worst part is it drives worse than stock after spending so much money. Did direct comparisons and low end / midrange torque is lost with the CAI, so you have to rev it to get going, plus tip in throttle response is worse so you have to mash the go pedal and downshift to pass.. IF there are any HP gains they are few and well up in RPM, where the Hemi spends very little of it's overall time. For a worthwhile mod, get an Intune with Hemifever CMR tune for not much more than a CAI.
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