vauxhall corsa C 2001 1.2 Z12XE P0170Archived Message
Posted by Alan Potter on September 28, 2007, 11:08 am
Can i ask if anyone can assist with this one. running weak.clocking up long term fuel trim of +25% after a long run, drives well only holding back slightly . Before i got involved had all ready had new maf and O2 sensor. after resetting trim the short term is correct at idle but will go to +25 under load at that point the ecu runs out of adaption and the lamda stops switching and hangs lean on scope and scan tool while watching fuel pressure gauge taped to windscreen showing constant 4bar even under heavy load. Pressure regulator in tank. assuming ecu adds to injector duration to make up for lack of manafold vac when the throttle is open? sprayed loads of carb cleaner while scoping lambda, no leaks. looked again at maf, will out put Max 4.2 volts on scope good enough but o2 goes lean, tried another anyway as i carry one stock. checked that 5 volts at maf out put is still 5V at ecu and on scan tool, blocked off evap, have not checked egr but feed back on scanner ok. any help very welcome. thanks Alan