I attached OBD to my car, Toyota Corolla 09, 175k on odo. I got the results which I'm attaching in a picture as well as excel file. I'm concerned about some of the parameters which I'm not sure of the accurate values at idle. These parameters are measured at idle. Acc to my knowledge, LTFT should be ±10. But it's -17 on my car. Similarly if someone can read and guide me about these results.
You have a lot of negative trim meaning that the ecu is taking away a lot of fuel. You will need to do a loaded maf test to determine if its good.
Have you had it cleaned a lot?
What is loaded MAF test and how to perform it? Yes, I cleaned it once with just spraying the cleaner over it and then after drying, reinstalled it
I have observed other parameters like Cal load at WOT, MAF flow rate, all these are fine. I don't suspect MAF to be faulty. However, I'm still not 100% sure. Looking fwd to more insite on this data
Yeah, that MAF is too clean now, its got to go - I'd also check the fuel pressure and injectors
How to check fuel pressure by the way? I have chacked fuel injectors and cleaned them. They are working fine as well. There's no MIL. Only problem I'm facing is it's taking 5 to 6 sec to start. First start of the day is good (usually around 2,3 sec). Subsequent starts take too long
you have to attach a mechanical gauge inline to the fuel pipe
