Anyone know what would cause a "pop" when coming to a stop or idling at a light? It has happened twice today, after going from 50-60 mph then coming to a stop, idling for a few seconds, then I get one pop. Engine runs smooth besides this.

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2006 Jeep Liberty CRD

Loose motor mount.

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2005 sport crd-SOLD No regrets

I get that, except mine isn't so much a pop but it is like a quick "boing". Some others have a more drawn out sound, and I think they might be related. I think somewhere pressure is being let off, and they sound different depending on how individual valves open.

This is completely speculation though. I've let it go for nearly a year and have seen no problems besides the noise yet. Haven't noticed it much lately, maybe once a month.

viewtopic.php?f=1&t=50161

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2005 KJ Renegade
Fabrications for sale: Aluminum Roof Rack (See Page 9)
Aluminum Gas Tank Skid -- Radiator Skid -- Front Strut Shims
Coming Soon: Rear Bumpers with lots of options

I would second the loose motor mount. Search for that, or my posts (author) on the same thing. Get it in a lift and use a 2x4 or some other non damaging fulcrum to see if there is play between the engine and suspension. For some reason the passenger side seems to be more common.

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El Jefe de Biosmell,
at your service!

2005 Black CRD Limited (18,000) now 130000 miles, GDE Eco-tune, Geordi timing belt job, Weeks delete and ARP studs. New rockers, head gasket, water pump and Etecno 7v plugs while we were in there. 100% Biodiesel 100% of the time!
2001 Dodge 24 valve Forest Green, 6" lift, full Banks Power Kit.

Could possibly be the rear differential binding on the splines of output shaft on the transfer case When you stop the rear of the jeep goes up. then when you start again it goes down and that's what mostly makes more of a feeling then a noise. When I first felt it on my 2nd XJ I thought it was a transmission but I knew when the third XJ did it and I lubed the splines on the 4th one when I replaced my u-joints. But my CRD has not done it yet and I asked they specifically lube it when they put my new TC in back in July

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Atlantic Blue 06 CRD Limited (his)
Joined by a 2000 XJ Classic (hers)

Mine was a broken motor mount when I heard the same sound under the same conditions

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06 Liberty Sport
DIESEL
Skid Row Engine and Fuel Tank Skid Plates, straight pipe, modified air box, Tow Hooks, 245/70/16 Hankook ATM RF10s, Kennedy Lift Pump,Home Made Provent, Husky Liners throughout, Wet Okole seat covers, All J Products Rear Storage Shelf, Fumoto, Frozen Rotors-Cross Drilled and Slotted, and Bilsteins all around

How does one go about "fixing" the loose motor mount? Does it simply have to be re-tourqed?

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2006 Liberty CRD Limited @185k
GDE Eco tune engine/trans
Samcos
Provent
Suncoast TC
Weeks Stage 2
3.7 airbox
5v bosch glow plugs
3" RRO lift/JBA upper A-arms
Steel roof rails/rack
Toyo Open Country ATIII 245/75r16
RRO kicker sliders
ARB lockers
Beefier brakes
NEXT ON THE LIST...
ARB Front bumper
WAM rear bumper
Skid plates

I forget the socket size but I had mine tightened about 4 years ago. They turned the nut about 4 turns of the ratchet and problem solved never to be heard again. Only the passenger side was a little loose.