Hi everyone,
I have a 02 discovery SD and it doesn't start after been driven. It will start just fine when it's cold, but if I turn it off and wait for 5 min it will not start. It turns over and over but doesn't start. I did compete tune up, plugs, wires, cleaned the fuel filter (attached to the fuel pump)and checked everything else for vacuum leaks. I have no idea what to look for anymore. Please help. Thank you in advance

 

do a search on crankshaft position sensor, and next time it will not start spray the sensor compressed air. Like you use clean your keyboard with tip it upside down to cool off the CSP if the truck starts you need to replace it.

 

The CKP sensor is at driver side rear of block. When it fails, it makes no spark. When it cools off, from water or compressed air or just waiting the bad connection re-makes, and you are off again. Will eventually start doing this when driving, or just quit. About $70. DIY possible, plug in sensor and let it dangle or have help to move wire from above. These parts come off, and must go back on in the exact order they came off. Attached are some shop manual pages.

The tip of the sensor rides in a machined groove of the reluctor disc and makes an electrical pulse about 60 times per revolution. Those pulses tell the ECU when to make the sparks. The tip can be bent, covered with metal shavings fuzz or the coil can have bad solder joint or shorting internally. There may be a few that have been field repaired, but owners who off road more than walking distance should have one of these in the spares kit.

 

By the way, this is a common Rover thing with D2's. The new replacement can usually be found a your local parts store for around $80 and there is a good video on Luck8 on how to replace it.

 

Y'all should sticky this thread. It's pretty classic cps symptoms and has a well written explanation with attachments.

 

Thank you all soo much for your help. I will try that today and will post the outcome.

 

To be clear -

1. Check for spark. No spark means cps is very likely the problem.
2. If you do have spark, swap the fuel pump relay with the wiper relay next to it and see if it starts.
3. If it still doesn't start, the cps can prevent fuel flow, so at that point I'd cross my fingers and swap it out.

I always point out the fuel pump relay in these threads, even though it's a far less common problem than the cps. However, it takes 5 seconds to check, so I figure it's worth checking before swapping the sensor. However, if the relay is bad it usually won't start at all or will start randomly. Cps problems are common when the vehicle is hot.

That's why we all think the cps is likely your problem.

 

What is the cps? I replaced the crank sensor and still same. I'l try the relays. Are they under the hood or under the steering wheel?

 

Sorry cps, I replaced it and want start at all..

 

I tried swapping the relays,and no change. It doesn't want to start, just turnes over and over. I have no idea what to look for anymore. If you guys have any suggestions it would be greatly appreciated. Thank you all again for all help and support.