toigye

L reg 95 impreza saloon ..as been starting and driving spot on till saturday morning.......any ideas please.. on cold start up very rough idleing intermittant power to accelerater like missfire once she reaches normal temp ok again ....one suggestion i do normally run ok on sainsburys super however i did have to put a tenner in of bp ultimate friday morning as was so low ... have filled back up with sainsburys now ...could this be cause or damp yet it as recently started fine in the frosts... or could it be a coil pack on way out your thoughts knowledge of this would be greatful ,,,
thanks ..danny

toigye

can anyone help

toigye

bump

myblackwrx

iTrader: (1)

Coolant temp sensor perhaps.

On previous fuel threads BP Ultimate has proved unpopular with imprezas.

toigye

and how does that cause the problem mate just trying to understand .i would never have thought of that

myblackwrx

iTrader: (1)

If the sensor gives the ecu a false reading then the ecu cannot correctly run the car (in this case it thinks the coolant may be cold when it is warm or the other way round).
I've had to change mine (93wrx) when i had a poor cold start and slightly dodgy idle.

toigye

cheers mate looks like i need to check it out should it show up on a diagnostic check . or is there another way to check it ..

joz8968

iTrader: (13)

For some reason BP Ultimate has been known to cause the ECU to pull timing, IIRC. Another member/mod on here, New Scooby 04 knows more about this issue.

myblackwrx, when you had cold starting issues because of the temp sensor, did the starter pinion engage the ring gear trying to turn the engine?

Or was it that the solenoid would click okay but the engine wouldn't turn? Then a few turns of the key later, the pinion eventually engaged and the engine fired?

myblackwrx

iTrader: (1)

toigye, when my temp sensor was going i didn't get the CEL coming on and it didn't register on the Select Monitor.
the actual sensor is cheap (about £20ish) and is relatively easy to change but you can always check the codes manually here Scoobypedia | Trusted knowledge for everything Subaru | Scoobypedia / Scoobypedia under the 'ECU' heading

Joz my engine would fire up fine but then the idle would go up and down from nearly stalling to about 1300 approx

joz8968

iTrader: (13)

Thanks.

That's helped, as now I'm certain that my starter is simply just tired, as the solenoid clicks away okay, but takes a few turns of the key before the pinion decides to get its butt into gear and come out to join the party, lol

toigye

cheers mate ill take a look and try and replace it thanks for your help

toigye

thanks guys after filling up with sainsburys again and doing a few miles also srayed engine electricals with damp start all seems good again i wont be put bp ultimate in her again ... thanks for help