Hi all, great site, extremly helpful. This is my first post as all the info ive needed before has been available in the forums.
I'll give as much detail as i can, hopefully someone can help!
I have an 2002 astra G, 1.6 8v z16se. Car started to have idle and hesitation problems a few months ago, changed all the usual, egr, throttle body, o2 sensor, etc but nothing seemed to work. I brought a cheap obd2 reader but ecu gave no codes. Yesterday i decided to 'reset' the ECU by unplugging the connectors, leaving for 30mins the plugging back in. This is when the real problem started, as i went to start the car again, i noticed the EML was not on when i turnt the ignition on, i tried to start the car, it will crank but not start! Tried to plug in the obd2 but says 'linking error'. I was beginning to think i blew the ECU, checked all fuses - ok. As i kept trying to start the car the battery started to die, this is when i noticed the EML on again with the ignition and my obd2 read the ECU again. No codes! Jumped off another car but as soon as the jump leads touched my battery the EML went off and couldnt read the ECU!
I'm thinking to send the ECU away for testing unless anyone can think of something else i can try! Hope this made sense...I would be grateful for any help.