scoobyladnewcastle

Hello got an impreza wrx 95 m reg it starts first time everyday but stop somewhere go away for a couple of mins and it won't start, the check engine light comes on it's turning over but wont start. Takes about 20 mins to get it started.

ALi-B

iTrader: (1)

Sounding like symptoms of a weak Crank sensor on its way out.

scoobyladnewcastle

what does this mean is it expensive hard to change?

roblyons_uk

mine is the same.started doing it 2 days ago now,its starts ok in the morning or when its been stood a while but if its been running then left for 10-20 min it wont start.i have been told that it could be something to do with the coil pack?or the sensors connecting to it

roblyons_uk

forgot to put email notification on sorry

wormeo

i had same problem on my impreza i replaced the crank sensor cos everyone was saying thats what it was and still did the same it turned out it was cam shaft position sensor which cost 103 +vat easy to fit tho which is one good point ,

roblyons_uk

where bouts is this in your engine then?i dont really know what im looking for

ALi-B

iTrader: (1)

Interesting about the camshaft sensor...as if that was failing, the ECU "should" resort to simultaneous injection and throw up a fault code. The exception is unless both crank and cam sensors are giving weak signals on cranking. In which case, It'll do the same as if it was soley a weak Crank sensor

Crank sensor is under the alternator, directly behind the crank pulley when look from the top of the engine. Easiest DIY way to diagnose without a oscillioscope is to borrow a known good sesnor, when the cars plays up, swap it over (5min job).

roblyons_uk

now u have totally lost me.so it could b coil,crank sensor or cam sensor or all 3

ALi-B

iTrader: (1)

It wont be the coilpacks, you'd expect to find the engine misfiring if it was.

roblyons_uk

orite,well thats 1 down then.its runs fine once its running

TREG

Sounds like a cam sensor,had one go on my N reg scooby years back.
Think it was about £150 to replace,that included finding the fault.

wormeo

when mine was faulty i used to carry 10mm spanner in the car and take sensor out and cool it down then put it back in and started straight away i would try cam sensor first not the other way round like i did ...