NorfickCitizen Posted August 23, 2014 Share Posted August 23, 2014 Hi, I'm new to the site but was wondering if anyone could help with a problem I have with my GB270. Sorry for a bit of a saga, but hopefully it provides most details needed for help....Impreza GB270 2007, secondary air injection system turned off in ECU.Recently ran fuel lower than normal then had to put in small amount of 95 RON. Ran for about 70 miles very gently then topped up with Shell V-Power. After another tank of V-Power, got some hesitation when cold which quickly turned tomis-fire all the time. Have only had a fault code once (mis-fire cylinder 4) which was cleared and has not re-appeared after driving 7 miles whilst missing. (not using now, thankfully have spare 2000 Turbo )Have tried new coil pack and plug in cylinder 4, no difference. Ran whilst coil pack off cylinder 4 and no noticeable difference, suggesting the problem is with cylinder 4.Does anyone have any ideas what could be checked next or advise best place to take car to in the Norfolk area.Any help would be much appreciated.Thanks Quote Link to comment Share on other sites More sharing options...
Gambit Posted August 23, 2014 Share Posted August 23, 2014 Hi mate welcome to S.O.C Could be a few things I'm guessing you have checked them all but will re list just incase or if it helps anyone else browsing :D Blocked injectors/dirty fuel filter Wrong/Worn or incorrectly gapped spark plugs Possible Maf giving a wrong reading to make one misfire. But normally it cuts the engine out at low speeds. Vacuum leaks. Check all the pipes for splits or loose connections Battery ground cable and ones that run to the intake manifold. Make sure they're clean and coilpack bolt holes. Bad/loose coil pack or coil pack connector PCV valve. might need replacing Quote Link to comment Share on other sites More sharing options...
Jay762 Posted August 23, 2014 Share Posted August 23, 2014 Wotcha and welcome - as above - keep us posted Quote Link to comment Share on other sites More sharing options...
stants Posted August 23, 2014 Share Posted August 23, 2014 Have reset the ecu ? Battery unplugged job ? Mabe it's judt a bit confused with the 95 going through Quote Link to comment Share on other sites More sharing options...
Gambit Posted August 23, 2014 Share Posted August 23, 2014 I know you will need to run about a full tank before it gets used to the fuel again. Quote Link to comment Share on other sites More sharing options...
NorfickCitizen Posted August 24, 2014 Author Share Posted August 24, 2014 Thanks for all the advice so far, I'll pass it on to my top mechanic - that'll be the brother !!. I'll keep you posted as to how I get on. Thanks again. 1 Quote Link to comment Share on other sites More sharing options...
NorfickCitizen Posted September 10, 2014 Author Share Posted September 10, 2014 Finally got the car fixed. It went to a local diagnostic expert / tuner Clive Atthowe (www.enginetuning.net) who eventually traced the fault to a dodgy connection within a large connector block between ECU and the engine. The injector on cylinder 4 was not grounding properly and hence closing gradually whilst it should be open, causing the misfire. Rather than split the connector and potentially cause more problems, a wire was soldered across the block for this cable only. The car is running sweet as a nut again, phew. Thanks again for all the advise given earlier. 1 Quote Link to comment Share on other sites More sharing options...
savage bulldogs Posted September 10, 2014 Share Posted September 10, 2014 Glad your firing on all 4 now . I always use attowes rolling road for any tuning , both clive and dan know their stuff [emoji106] Quote Link to comment Share on other sites More sharing options...
Gambit Posted September 11, 2014 Share Posted September 11, 2014 Thats great news mate. Glad to hear you have got it sorted :) And well done to Clive for finding it I bet that was a ball ache :) Quote Link to comment Share on other sites More sharing options...
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