My 2002 Disco starting stalling when hot and then would not restart till it was cooled down. I read several threads on this forum and determined it was the Crank Position Sensor. I replaced the sensor and now it doesn't shut off, but goes into limp mode randomly. Before going into limp mode I will feel a couple jerking motions (like it's loosing throttle then kicks back in) and then a few seconds later it switches to limp mode. My first thought was that the new sensor was to blame since it didn't happen till it was replaced, but I read other threads on here stating that voltage could be the problem so I wanted to check that first and my voltage regulator was in-fact failing on the alternator. I replaced the alternator and voltage is constant now but I'm still getting thrown into limp mode most time I drive it. It seems to only do it after driving several miles and once it happens and the engine is hot it is more persistent. Sometimes I can shut it off and restart and it's back to normal, but not for long. I get the jerking again, and back to limp mode. Sometimes shutting it on and off has no effect, but after it sits for a while it will be fine again. Also when in limp mode if I continue to drive for half a mile or so it will start jerking back and forth and force me to pull over and shut it off. It doesn't want to continuously drive in limp mode. Could the new Crank Position Sensor be defective and causing this? Any other ideas?

 

Limp mode can be cause by multiple different problems
1. you must be putting out 13.5vt or better or the tranny will go into limp mode.
2. just about any bad or poor ground can put you in limp mode.
3. a bad XYZ switch will put you in limp mode
I would go back to the CPS check that it is CPS, spacer, nuts, in that order

 

The BEST way to troubleshoot would be to hook up a land rover aware code reader and find out what the transmission thinks is wrong.

Do you have a battery charger? If so, I'd make sure the battery will take a charge and is fully charged. One of the symptoms of a bad crank sensors is that it won't start, so a lot of people run the battery down trying to start it. A low battery can cause limp home.

 

I let this vehicle sit for almost three years due to body damage, just starting it occasionally and have had the Three Amigos since I switched out rear axles. My dash looks like a Christmas tree now with them, brake light and service engine light on. I just went to autozone and had them pull codes and check voltage, battery, etc.... I didn't reset it after replacing the Crank Position Sensor and now have some new codes since the last time.

P1884 -which seems to be Engine coolant lamp
P1590 -think that one is due to three amigos
P0335 -Crank Position Sensor (probably working now but never cleared)
P0505 - possibly "idle air control"???
and
P0150 -Bank 2 sensor 1 oxygen sensor (I'm thinking this is the new culprit for this issue)

I noticed today when it was stuttering I smelled a sulfur/rotten egg smell and after googling and searching here, this sounds like the new problem.

 

P1884 is a code that means, hook me up to a land rover aware computer. There are half a dozen "sub-codes" that go with that. They are all error that the transmission computer is seeing, and relaying to the engine computer over the CAN bus.

 

Is "Bank 2 Sensor 1 = passenger side front" correct?

I have an 2000 disco II that I bought with a blown engine for parts. Hopefully I can just switch it out.

 

Ok, I'll have to look into that then.

 

Where are you located? Maybe someone nearby has a hawkeye or nanocom.

With all of these seemingly unrelated faults, this makes me wonder if you've got a wiring harness or fusebox issue. Maybe even a computer problem. My 99 had leaky sunroofs or something and the computers were all green inside, on the right side under the dash.

 

I'm in the Daytona Beach area, and I do have a leak from my sunroof/windshield. :/

 

Now that I re-call I was getting a code for throttle position, and it would cause a variation of the 3 amigos.

I would say pull the computers, open them up, and take a look at them. If they are funky inside, swap them from your parts car. Maybe the fuse box too.

I put used computers in my 1999, and they were better than what I took out, but they still weren't GOOD. I ended up having to clean the circuit boards and connectors.