All,

My CRD has developed a concerning noise under the hood that I need help diagnosing. Description - when the key is turned to "ON" the squealing starts (i.e. before the engine turns over) and the squealing continues a few seconds after the engine stops running. The squealing has become quite loud. What do you think? Is there a fuel pump that pressurizes the rail? Any help will be greatly appreciated - thanks in advance.

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-Dr. Dave

2006 KJ CRD - lift, tires, winch, baby seat

Flow control valve

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06 LIMITED 100000miles, MAGNAFLOW, HOMEBUILT CCV FILTER, POLAR PAD, 02 AIRBOX, CUMMINS LIFT PUMP, SEGR, PILLAR GAUGE POD, CAT FILTER MONITOR, SPYDER TRAX, ALWAYS A LITTLE TWO STROKE OIL OR BIO, WATER/METH INJECTION

Unplugging the FCV is a fast way to check this. Does your CRD have a lift pump installed? The lift pump circuit is wired to run as soon as the key goes to ON, and continue running for 10 seconds after the key is turned OFF. But if it is the FCV... You are OK running with that unplugged - I've had it completely unplugged for several months now, with no ill effects OR any CEL. And the shutdown seems just ducky to me, no "rough shutdown" like it is supposed to be there for. On the contrary, I'd say the biggest use of the FCV is to further annoy the engine by increasing the EGR flow instead of clean life-giving air to the cylinders.

Totally can live without that.

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Proud supporting vendor of LOST Jeeps
TRAVELING CRD TECH. I come to you!
Need help? Just ask! I've taken it apart more than most.
Email jeep [at] maincomputer [dot] com - BOARD MESSAGING IS BROKEN
Over 225 CRDs currently driving with my valves, timing belt, rockers, or ARP Studs.
Bad noises = REALLY bad things.

Are you sure the lift pump runs for 10 seconds after shutdown? What would be the reason for it? I know mine shuts off immediately after the key is turned off, I am wired into the factory circuit.

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06 LIMITED 100000miles, MAGNAFLOW, HOMEBUILT CCV FILTER, POLAR PAD, 02 AIRBOX, CUMMINS LIFT PUMP, SEGR, PILLAR GAUGE POD, CAT FILTER MONITOR, SPYDER TRAX, ALWAYS A LITTLE TWO STROKE OIL OR BIO, WATER/METH INJECTION

It doesn't run on after you key off. It does run on for about 15 seconds after you key on if you don't crank it.

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05CRD: GDE Hot ECU & TCM tunes, Provent, Cat filter, Facet lift pump, TransGo kit, Florida TC, Samcos, stainless brake lines, HDS thermostat, Renegade light bar,
RL super sliders, Bilstein adjustables, Al's Gen 4.5 Arms, 235/85-16 Duratracs, DTT rear, Elocker front, EVIC+TPMS, Turbo timer, McNally pillar gauges, Weeks Stage II kit.

Then the lift pump is ruled out as the problem in this case.

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06 LIMITED 100000miles, MAGNAFLOW, HOMEBUILT CCV FILTER, POLAR PAD, 02 AIRBOX, CUMMINS LIFT PUMP, SEGR, PILLAR GAUGE POD, CAT FILTER MONITOR, SPYDER TRAX, ALWAYS A LITTLE TWO STROKE OIL OR BIO, WATER/METH INJECTION

Didn't someone on here have a problem with a vacuum accumulator making a lot of racket? Not sure if it was a squealing sound though....

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2006 Liberty CRD Limited

Provent @ 43,000 km
SEGR in progress
SAMCO Sport hoses @ 48500 km
Goodyear Wrangler Duratrac LT225/75R16