Howdy. Long time reader, first time poster.

I have a 2005 KJ CRD Limited with 83,000 miles. Lately I've been getting about 15mpg around town (used to be 20ish). I've usually had a drop off in the winter, but never like this. Also, it seems to be in base boost mode. Normally this thing will do wheelies off the line, but now it is very sluggish. No CEL or other indications of anything amiss. Thoughts?

Have you checked your boost hoses? (From the turbo to the intercooler, and from the intercooler to the intake)
Cleaned your MAP Sensor?

Can you post what mods you have done to your jeep (if any), it can help rule out some options.

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Phil
2005 131k 3.7 Gasser (Lifted-CRD Springs, 4.10 Gears, F+R DTT, Teraflex 2wd Low, Skidrow/Mopar Skids, Rock Lizard Super Skinks, Goodyear Wrangler Authority 31x10.5-15)
2012 Triumph Tiger (TKC 80 Front Tire Heidnau K60 Rear, Crash Bars, Skid Plate, Bark Busters, Pelican Case Top Box)

Also you probably need to immediately check your turbo intake hose. It is the hose that runs from the back of your air filter box down to the front of your turbo. Once you take the clamp off of the front of your turbo, specifically check the bottom of the hose for cuts and tears.

Also check your intercooler hoses, take them all the way off of both sides, remove the wrapping and check the full length and circumference on both of them for any holes or cracks.

Losing boost pressure will cause the problems you are experiencing, and the hoses are known failure points.

Let us know, thanks!

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Silver 2006 KJ 2.8L CRD Limited:
GDE ECO Tune / Fumoto Valve / E-Tecno GX3123 7v Glow Plugs / 2nd Gen Fuel Head / Mishimoto RED Hoses / Rockers/Lifters @ 114k / Hayden FC + 11 Blade Nylon / Sears P1 Battery / Transgo 45RFE-HD2 Reprogramming Kit / Timken Front Bearings

Thanks! The boost hoses were fine at last check 5 months ago, but will check again when it's not so cold outside. Currently 0 degrees F right now. I will post back with my findings...

Dwightdan,


Tell us a few things about your Jeep?

1. Any Mods? Tune? ORM? EGR operating?
2. Timing belt been changed yet?
3. Last time the Fuel filter's been changed?
4. Last time the Air Filter's been Changed?

These will help us understand you Jeep. If you still have an active EGR? That may say a lot.

Best regards
KJJET

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05 Liberty CRD Sport with Leather 115k
GDE ECO, No EGR, no FCV, (system gone)
Oil Drain plug P/N 090-039
K&N Air Filter, 2nd gen Fuel filter head
NEW Rockers & lifters
Mobil 1 0w-40
Stant 13519 195 deg inline Thermostat.
0 281 002 845 MAP
Etecno GX3123 7v Glow Plugs
Advance Gold 800CCA Battery
Traded it for a Quality VW TDI

Full stock, no mods. Timing belt hasn't been changed, but only at 83k miles. Fuel filter was changed a year ago Nov 11, but only 10k miles ago. Will do at next oiled change. sake with air filter. Active EGR, though GDE is on my short bucket list.

O... Sorry but the last thing you need to worry about is Fuel mileage. That could be caused by lots of things.

1st A build up of EGR crap in your intake, due to EGR use.
2nd Rocker failure, due to EGR use.

FYI.. You need to change that timing belt. Its to old and brittle, may break anytime.

Sorry to say, but your driving a time bomb!

Best regards
KJJET

_________________
05 Liberty CRD Sport with Leather 115k
GDE ECO, No EGR, no FCV, (system gone)
Oil Drain plug P/N 090-039
K&N Air Filter, 2nd gen Fuel filter head
NEW Rockers & lifters
Mobil 1 0w-40
Stant 13519 195 deg inline Thermostat.
0 281 002 845 MAP
Etecno GX3123 7v Glow Plugs
Advance Gold 800CCA Battery
Traded it for a Quality VW TDI