Every now and again when i go to start the car the engine to turnes over but doesnt start.....Never happens from cold, generaly if ive been driving got out the car then say an hour or so later got back in it wont start.

Probably takes 3-4 minutes to get the car to start

MY98 UK Turbo, with PPP, K&N.

Any idea's.....?

 

Probably cam or crank sensor, had a similar problem with mine, it was fine from cold but would play up when restarting with a warm engine. I replaced the cam sensor and its been fine since

 

were is the sensor, is it something easy to fit, what cost are we on about

 

Got mine from gradea-subaru.co.uk cost £25 and its a 2 minute job to replace. The cam sensor is mounted above the right hand upper cam (as you face the engine bay).It has a connector on it and is held in by one bolt.

 

Which one....?

Ive circled two sensor's....?

 

The one on the right is the cam sensor, thats the one I replaced on my car (95 wrx import), did the trick for me. Other threads on this forum dealing with a similar problem also suggest replacing the crank sensor. A self test should indicate which sensor is at fault.

http://www.saxonfields.freeserve.co.uk/Scooby%20Page/ECU%20Diag%20Page.htm#_top

 

dont get any error codes, i will just have to get both sensors.

 

circled, right is cam sensor and crank is the left sensor.

Cleaning them can solve the problem for a short time.. they are magnetic and slowly get less sensitive etc..

Just undo the 10mm bolt and disconnect plug and lift to remove..
Don't tighten to hard as they are plastic on the edge where the bolt goes to isolate them from the block.

Error codes only logged when they are a long way out of tolerance or totally dead..

JGM

 

took both sensors and cleaned.. the one on the left was very dirty, ill see how it goes over the next few days.

 

u just use brake cleaner or such?
i mgiht take mine out and give them a quick squizz over to see if there dirty

 

just a wipe over with a cloth did it for me....