As far as I know it’s in the tank. Someone please correct me if I’m wrong. Since your problem only occurs when you hit a bump I would look for a lose connection somewhere. I know that’s not much help but it would be the first thing I would look for.
:cheers2:

 

Two fuel filters are used. One is located at the bottom of the fuel pump module. The other is located inside the module. A separate frame mounted fuel filter is not used.

Both fuel filters are designed for extended service. They do not require normal scheduled maintenance. Filters should only be replaced if a diagnostic procedure indicates to do so.

 

Two fuel filters are used. One is located at the bottom of the fuel pump module. The other is located inside the module. A separate frame mounted fuel filter is not used.

Both fuel filters are designed for extended service. They do not require normal scheduled maintenance. Filters should only be replaced if a diagnostic procedure indicates to do so.

Thank you! I was already getting frustrated that filter was NO where near the gas tank.

 

^^^So in other words, they are in the tank?
:cheers2:

 

Just answering the OP's question with a little more information.

 

When the tach goes to zero is it just the tach or do you feel the motor nearly stop as well? How fast are you going when this happens?

 

Thanks so much for all the reply's everyone.

The tach will go down depending on the frequency and severity of the bump(s) all the way to zero, and the engine will stall.. completely shut down. I have had it stall, and I was at 50k going over a few bumps

This is very sensitive now, I'm talking just driving down a regular street with bumps in the city.
I live in Winnipeg Canada, where there are really crappy streets, but still, even these relatively minor bumps will bring the tach down and even stall the vehicle. That ESP light also came on steady one time... but then went off.

Isn't there some kind of poor mans little computer thing you can plug that flashes a sequence of lights indicating whats wrong?

 

Chances this is due to the fuel filter...............slim to none. I would guess it to be electrical, wiring some where? Check the throttle assembly wire loom (from the pedal).

Best of luck.

 

Another note*
I had the block replaced (Jeep dealer did the work) ... after hydro-locking the engine... (I know.. I'm a noob),
What are the chances they left something loose?
When I installed my snorkel kit, I noticed they didn't even lock down the air filter container.

anyway it seems like it should be something simple...ish. It does sound like some of you are saying, that something is loose....

Any other ideas you have, would be appreciated

 

Another note*
I had the block replaced (Jeep dealer did the work) ... after hydro-locking the engine... (I know.. I'm a noob),
What are the chances they left something loose...?"

^ Answer is this ^
:kiss:

 

Have you yet to look everything over for a loose connection? That’s what it sounds like is wrong. Besides just doing a visual, grab each connector to see if they’re locked together.
:cheers2:

 

Have you yet to look everything over for a loose connection? That's what it sounds like is wrong. Besides just doing a visual, grab each connector to see if they're locked together.
:cheers2:

Will do. :cheers2: As soon as I get a chance, I'll do just that.
Let you know how it goes.

 

Nice pic, does your buddy sit in the front with you?

Edit: Is that two dogs I see in that pic?
:cheers2:

 

Yes, that is two dogs.

They love riding in the Jeep. You say the word "Jeep", and they go crazy. I fold the back seats down and they ride in the back. They usually have their heads poked through the two front seats. Yea, the front doors off, I wouldn't want them in the front. I'm over some crazy terrain usually, and they have a tendency to bolt after deer.

The young one on my right, jumped out the back window at 60 k on a dirt road one time, when she saw a deer. Lucky she didn't kill herself. She mostly rolled through a ditch full of bulrushes and water. So now it's the cargo net, windows half way up, and they ride in the back. It's funny. If I am about to go over a bump or into a sharp turn , I yell out ... "Hang on girls!" and you can look back and see them bracing themselves and leaning right into the turns. I'm pretty sure they are having a great time. The spots we stop are usually way out there and they love the bush and stuff. That's her mom on my left.

I'm just taking a break from getting a proper wind on the winch cable there in that photo...

Still haven't found the problem with this Jeep.
I'm trying to hunt down a haynes car manual for this Jeep. Because when someone says to me... "Check the throttle assembly wire loom (from the pedal)", I haven't got a clue what they are talking about.
Hopefully I can track down this problem soon. Summer is very short out here in Manitoba, and the Jeep'n days are a wasting. My dogs are getting depressed too : (

 

well... I've got one of these... and one of these... Maybe now I can get somewhere.
Only thing is now... it seems like there is a million things to check....

 

well...
I'm not too surprised. I didn't expect to be a mechanic in a minute with the reader. I'm just hoping to save a few bucks is all....

When I first plugged it in I get ...
Read #1
P0300 - Multiple Cylinder Misfire
P0339 - Crankshaft Position Sensor Circuit Intermittent

I have the freeze frame data for this bellow.
I read where the freeze frame data will be overwritten on the second error so I clear the codes and go for another drive.
It stalls again and the engine light comes on. I stop and take another read...

Read #2
P0339 - Crankshaft Position Sensor Circuit Intermittent

So well now I'm trying to figure the best guess from here.

The words "Crankshaft Position" scare me cuz I hydro-locked my engine and had the block replaced. I worry that those guys didn't replace everything they should have.... When I put my snorkel in, I noticed they didn't even snap down the air intake box... it was left open...for more water to get in

Anyway, for you pro's I'm gonna post both freeze frame readouts below. Any help would be great...




Freeze Frame Data Read #2
----------------------------------------------------------------------------
MIL DTC
P0339
Crankshaft Position Sensor Circuit Intermittent
Pending Codes
P0339
Crankshaft Position Sensor Circuit Intermittent
Diagnostic Information
Freeze Frame Information
Parameter Description Value
DTC for which Freeze Frame was Stored P0339
Fuel System 1 Status Open Loop
Fuel System 2 Status Open Loop
Calculated LOAD Value 63.53 %
Engine Coolant Temp 199.40 °F
Short Term Fuel Trim - Bank 1 0.00 %
Long Term Fuel Trim - Bank 1 7.03 %
Short Term Fuel Trim - Bank 2 0.00 %
Long Term Fuel Trim - Bank 2 7.03 %
Intake Manifold Absolute Pressure 10.66 inHg
Engine RPM 963.00 rpm
Vehicle Speed Sensor 28.58 mph
Ignition Timing Advance #1 Cylinder 33.00 °
Intake Air Temperature 87.80 °F
Absolute Throttle Position 16.86 %
Time Since Engine Start 135 sec
Commanded EGR 0.00 %
EGR Error 0.00 %
Commanded Evaporative Purge 0.00 %
Fuel Level Input 25.88 %
Barometric Pressure 29.02 inHg
Control Module Voltage 13.62 V
Absolute Load Value 39.22 %
Commanded Equivalence Ratio 1.00
Relative Throttle Position 6.67 %
Ambient Air Temperature 75.20 °F
Absolute Throttle Position B 17.25 %
Accelerator Pedal Position D 23.14 %
Accelerator Pedal Position E 11.37 %
Commanded Throttle Actuator 7.45 %
----------------------------------------------------------------------------


Freeze Frame Data Read #1
----------------------------------------------------------------------------
P0300
Multiple Cylinder Misfire
Stored Codes
P0339
Crankshaft Position Sensor Circuit Intermittent
Diagnostic Information
Freeze Frame Information
Parameter Description Value
DTC for which Freeze Frame was Stored P0300
Fuel System 1 Status Closed Loop
Fuel System 2 Status Closed Loop
Calculated LOAD Value 54.12 %
Engine Coolant Temp 194.00 °F
Short Term Fuel Trim - Bank 1 4.69 %
Long Term Fuel Trim - Bank 1 1.56 %
Short Term Fuel Trim - Bank 2 1.56 %
Long Term Fuel Trim - Bank 2 0.00 %
Intake Manifold Absolute Pressure 17.17 inHg
Engine RPM 362.75 rpm
Vehicle Speed Sensor 20.51 mph
Ignition Timing Advance #1 Cylinder 43.00 °
Intake Air Temperature 75.20 °F
Absolute Throttle Position 18.82 %
Time Since Engine Start 1272 sec
Commanded EGR 47.45 %
EGR Error -3.13 %
Commanded Evaporative Purge 0.00 %
Fuel Level Input 33.73 %
Barometric Pressure 29.31 inHg
Control Module Voltage 14.50 V
Absolute Load Value 34.90 %
Commanded Equivalence Ratio 1.00
Relative Throttle Position 8.63 %
Ambient Air Temperature 60.80 °F
Absolute Throttle Position B 19.22 %
Accelerator Pedal Position D 21.57 %
Accelerator Pedal Position E 10.59 %
Commanded Throttle Actuator 9.02 %
----------------------------------------------------------------------------

Thanks

 

Have you tried driving without the ESP on?

I had a buddy who had bought a 2007 Sahara new and had experience a similar problem. The issue wound up being the ESP sensor that detects the pitch and roll of the vehichle. Part of the ESP program is setup to drop the throttle when an extreme amount of roll or tire slip is detected to prevent a roll over.

 

With that CKP Code that is the direction I would be looking in 1st,Check the connection @ the CKP sensor make sure it is securly attached,That sensor is not too expensive wouldnt hurt to just swap it out with a new one.

 

This could be very dangerous... Even life threatening for anyone driving the same model Jeep...

While coming of a high speed freeway, onto an off ramp, I hit a bump and the whole engine went dead! There was a steep hill on the edge of the off-ramp and now I had almost no control of the vehicle!!!!

No power steering - No power breaks nothing... I am a full grown man and I could barely keep control of the Jeep as I came into the sharp curved off-ramp.

I tried breaking as hard as I cold but it would only slow down gradually. If there had been something or someone in front of me, I would not have been able to stop!!! If my mom or someone smaller weaker had been driving, there is no way they would have been able to maintain control.

- The (I think it is heat protection insulation. It has a metallic surface and insulating underneath) insulation came lose from the "one" "plastic" clip that was holding it on.
- This large piece of metallic insulation was now hanging down and rubbing up against the wires leading to the Crankshaft Position Sensor.
- This had rubbed the cover of the wire off all the way down to the copper wire underneath.
- Now there is metallic surface rubbing against the copper wire. This is what caused the complete stall of the engine

------------------------------------------------------------------------------------------------------------------------

- One smaller bump, the tachometer would drop
- A series of smaller bumps, the tachometer would drop and if it continued the engine would stall.
- A large bump or series of, the engine would stop. From any speed, and in this case at 80k coming off a freeway and onto an off-ramp.

VERY DANGEROUS - Check yours!

 

Wow, glad you made it through all right, way to close of a call. I’ll have to take a look at mine now. Thanks for the heads up.
:cheers2:

 

Wow, glad you made it through all right, way to close of a call. I'll have to take a look at mine now. Thanks for the heads up.
:cheers2:

Yea, thanks...
Please share the youtube video link so others can know of this as well...

 

Still haven't found the problem with this Jeep.
I'm trying to hunt down a haynes car manual for this Jeep. ([/QUOTE]

There's a guy on ebay in EU who offers the repair manual for twenty bucks on CD...I just got mine

 

Still haven't found the problem with this Jeep.
I'm trying to hunt down a haynes car manual for this Jeep. (

What is the problem with your Jeep?
I have a manual - I'll look up whatever you need.

 

What is the problem with your Jeep?
I have a manual - I'll look up whatever you need.

 

I've had similar issues and the especially and anti-slip lights came on. Turns out, each wheel has a sensor and two of the four were cracked/broken. I replaced all 4 and no more issues.