aaron-rs197
Paid Member
hi all. im suspecting an injector may not be fully working at idle/low revs. any tips on how i could diagnose? is this something i could monitor with obd scanner or clip?
injector fault diagnosis
- Thread starter aaron-rs197
- Start date
aaron-rs197
Paid Member
i've spoke to a couple rs specialists on the phone who suspect it may be an injector issue. before taking it in to one of them (there are all like 200 miles away from me), i'd like to have a go at diagnosing myself, if its possible.
aaron-rs197
Paid Member
no worries. thanks i'll have a look at that then. can you point me toward any useful resources on what good values should look like under different scenarios at all ?
aaron-rs197
Paid Member
short term fuel trim is like +50% to +60% on idle and long term fuel trim is stuck on 0%.
there is another reading which i am not sure about. the one in green is stuck at -100%. can anyone shed any light on this reading plz? thanks
there is another reading which i am not sure about. the one in green is stuck at -100%. can anyone shed any light on this reading plz? thanks
aaron-rs197
Paid Member
yeah the pre-cat is operating normally - oscillates between 0v and 1v. the post cat sensor sits dead on 0.45v
what i don't understand is how the long term fuel trim can be sat at 0% while the short term is up at 50,60 even 70%!!
what i don't understand is how the long term fuel trim can be sat at 0% while the short term is up at 50,60 even 70%!!
aaron-rs197
Paid Member
also another thing im not sure about, maybe someone can clarify.. if the car has been decatted, shouldnt the pre and post 02 sensors be reading the same. or are they looking for different things? would i be right in thinking in the case of a decat if the post sensor was seeing the same readings as the pre sensor, it would throw a fault code? unless bodged or modded somehow to stay healthy?
