So I have a strange problem, and I'm really hoping you guys can help me out.

I have a 2005 CRD with just over 140K on it (regular fluid and filter changes, new style fuel head, timing belt done at 110K, no real mods except a homemade pro-vent). On days when it is HOT here in FL (90+), I can start the jeep, drive it around, no issues, but after the jeep sits for about 10-15min, it won't start again until 30-60min have gone by.

Also, on any given day, before the jeep is fully warmed up, it might just shut off while decelerating or sitting at a light, and not start until it decides to start (no real time frame here, sometimes it's 15sec, sometimes it's 15min).

For the hot no start I came across this thread http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=80284 and thought I had found my answer. Until I did an injector return check when it wouldn't start one hot day, and they all showed the same 1/4-1/2in return while cranking. I didn't check the fuel pressure solenoid, but I figured if this was failing it would throw a code, right?

For the random shutting down before being fully warmed up I found this thread http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=80284 and it made me wonder if it could be the CPS and/or the ASD relay causing the random shutting down, and maybe even the no starting after it's sat for a bit when its hot outside.

I haven't checked the ASD relay to see if it is bad (I'll be doing that here soon) and I haven't pulled the CPS to test it with a multimeter and hairdryer yet either, just didn't have time for that this weekend.

I guess I'm just looking for some 2nd, 3rd, 4th, 5th, etc opinions. TIA!

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05 KJ CRD
Samcos
Weeks intake
Low-PSI inline fuel pump
workin' on it

ASD relay could be part of it, buy 2 and replace them both of that type while you're in there.

Also you might want to consider changing out your Cam Position Sensor if you haven't done that already.

Also, if you don't regularly clean your MAP sensor, clean it and your MAF sensor.

Try those 3 things. Are you using a 1st or 2nd gen fuel head?

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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

Sure sounds like a crankshaft sensor crapping out.

I don't think that a camshaft position sensor will stop an already running engine

Good luck with a quick diagnosis, let us know what you find.

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TWO Identical 2005 Liberty Sport CRDS
#1 CRD, 174,000 miles. Eco tune, Samco hoses. Mobil1 0-40w used since day one
#2 CRD 143,000 miles. Bought used (unknown history) with 100,000 miles. Samco hoses.
Eco tune, new rockers, and 5 volt glow plugs installed at 124,000 miles

I haven't cleaned the MAP or MAF sensors in a few years , they're due for a cleaning, but I wouldn't think they could shut me down or keep it from starting. I just tested the ASD relay, and it passed just fine.



I'm leaning towards the crankshaft sensor myself, not the camshaft sensor. I'll be checking that one next.

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05 KJ CRD
Samcos
Weeks intake
Low-PSI inline fuel pump
workin' on it

Yes crank sensor. Sounds exactly like your issue. Most easily accessed from BELOW the vehicle.

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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.

I'd say air in fuel, or broken rockers, maybe even TC shudder!!!


Seriously though, start digging around here for the fuel system diagnostic flowchart.

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-Rich
It must be air in the fuel!

My bad, I forgot to mention that I have a low PSI inline fuel pump hooked up, right at the tank and I don't have any of those terrible plastic clips on my fuel lines anywhere. No air in the fuel.

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05 KJ CRD
Samcos
Weeks intake
Low-PSI inline fuel pump
workin' on it

I ordered and swapped out the crankshaft position sensor, as I feel that is what was plaguing the Jeep. But now I'd liked to test it, and I didn't see anywhere in the service manual on how to test it. If someone would be so kind as to tell me, that would be great.

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05 KJ CRD
Samcos
Weeks intake
Low-PSI inline fuel pump
workin' on it

See jeepdan's post about half way down the page at viewtopic.php?f=5&t=64199&start=80

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Sold to LOST member my 05 Ltd, GDE Stg II turbo + TCM tune, SunCoast TC w. Transgo kit, Steiger window regulators, Samcos, Fumoto valve, 2nd gen filter head with Lub. Spec. bleeder, Hayden clutch & 11 blade fan, inverted spare, P-1 battery, BF Goodrich Long Trail TAs, Etecno1 glow plugs, timing belt at 50K miles/8 yrs

Well I never got around to testing the crankshaft position sensor before my wife threw it in the recycling bin. But the new one has been in the Jeep for just over a week now and it hasn't stalled out on me, or even tried to, and it hasn't had any "hot no start" issues either.

I'd say my problem is solved, and as always I'm very grateful for the resource that is this awesome forum.

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05 KJ CRD
Samcos
Weeks intake
Low-PSI inline fuel pump
workin' on it