Ford Focus not starting when warm

+1 Crank sensor. On my 2001 Focus it's very close to where the dip-stick tube enters the engine block. It's not the camshaft sensor at the top of the engine.

I found it very fiddly to get out/in as Ford have put the bolt the wrong side of the sensor but it is DIY if you have a spare half hour. I used the correct size socket from a 1/4 inch drive socket set on the bolt but with an allen/hex key to turn it.

See second to last post in

or

On my 2001 focus when I had the same fault (crank shaft sensor) no fault codes were seen even when checking in the time between the engine being warm and not starting and it running OK. On some occasions constantly trying to start the engine would take out the fuel pump fuse (in the fuse box under the bonnet).

On my Focus 2001 I can hear the fuel pump priming just before starting the car (radio off and in a quiet location). When I had the warm/hot start fault the fuel pump wouldn't prime up. If waiting for the car to cool down and I heard the pump priming it would always start without problems. Once started there were no further problems with driving performance. With reference to the above link, a faulty crank shaft sensor doesn't report the correct condition to the ECU and as a result no fuel pump operation on start-up (first sentence in the description of start-up sequence).

I found an interesting one the other day on an 03 focus 1.6. It just stopped one day, turned out to be the fuel pump, a wire inside the tank had failed, it was not practical to repair so it got a new pump, which was not too terrible in price.

I don't know the Focus, but on my elderly BMW E39, a faulty crank sensor doesn't stop it. It uses the cam position one for a limp home mode. Fixed ignition timing, so well down on power.

Sorry i meant to write, i had the crankshaft position sensor replace not ca mshaft sensor, i also noticed that if i sit in my car with the ignition tur n to position 2 (not starting just switching the electrics on) after about

5/10 minutes the car will not start even though the engine is cold. It seem s once the electrics are warm the car will not start. Maybe an electrical c omponent goes open circuit preventing the ignition from firing. Any coils t o look out for?

ignition coil is a common petrol focus fault, but it usually lets go on two cylinders first, later ones have individual coil packs

My Rover 25 became difficult to start, taking several spins before it would fire up. Once going though, it ran fine. After lots of fiddling I settled on the fuel pump, bought one on Ebay and my local guy fitted it for me and it's been fine ever since. The pump wasn't the cheapest available @ £45 IIRC.

Andy C

Had same problem, took out crank sensor cleaned, put back problem solved

I have the same problem like author. Position sensor is changed, id doesn't help. Some one found how to solve this problem? this is problem with 66kw, 2000yer diesel engine

What author? This is a news/usegroup.

- If you are sending a reply to a message or a posting be sure you summarize the original at the top of the message, or include just enough text of the original to give a context.

Possibly replying to one of my posts or a similar follow-up made 2014 which, in the normal way, disappeared from our news servers a few weeks afterwards.

Both of the relevant posts referred to a UK petrol model. A diesel model is likely to have a different set of solutions for not starting when warm.

replying to alan, Bob Cullen wrote: To many petrolheads will give unbelievable answers (some correct) but always start with the easy stuff. No1 change the key!!! My wife had a full service, diagnostics checks everything, new battery, fuel filter etc but nothing worked. Then some young lad said try your spare key, it worked first time. It was the key, the sometimes just lose their programming, simples.

Could be the ignition relay sensor it's a fault with the relay thatbisnt picked up via diagnostic testing