fuel trims problem

[stam525]

Dear friends hello.Sorry about my English, im from Greece and i can't whrite perfect!
Somebody knows about fuel trims?Because i have some problem and i can't understand whats going on in my car!
I have an hho system and works perfect with 1,5lpm at 1400cc engine
I install an EFIE electronic with 2 o2 sensors and maf.
I install it correct and a have lean out all sensors in maximum position as the manual say.
I check all sensors with voltmeter and works good and in close loop condition
After all i take a scantool and check all parameters from ecu on obd2 port.
And the long fuel trim was +10!! The ecu reads lean and increase more fuel???
We calibrate the o2 to read rich no lean!What's going on there!
After all instalation take for a ride to test the gains and result.
My car accelerate more powerfull,a lot of torque increase,and fuel economy was great! 30% economy than before!
I have make a lot of changes in efie with different configurations and the Fuel trims always goes to + condition!Never see - at all.What's going on.Somebody knows about trims or ecu tuning?
Thanks a lot!

[stam525]

I have to inform you with some results.
First i calibrate the 02 sensor 200mv up and the second 200mv up and map sensor in stock mode.
My long fuel trim was 11 at medium speed and 9 at idle.
After reset the trims(battery out) and test my car in stock mode without hho and efie.
The results are long fuel trim 7 at all(idle-medium speed)
After reset the trims again and install the efie again and the hho system.
I calibrate the efie, first 02sensor at 250mv the second 200mv and maf down 30mv.
When i start the engine the short fuel trim was +10-12 and the long 0 because i have reset it.
After few minuits i put the maf at 10mv down and the first o2 at 300mv(this is the higher point,after that point the sensor stop function and stay at steady volts).
The sort fuel trims after that drops to 0 and goes -1and+1 and the long fuel trims stay at 0.
After that take the car for road test.
My car power has the same power of acceleration,ignition time is good,temperatures are good,at 60mph and 3500rpm my long fuel trim goes to 3 and when i stop goes again to 0.
Somebody knows whats going on with my fuel system?I think after so sensors enrichment(+300mv) the long fuel trims must be in - mode at all.
I can't understand the result of economy.For this condition i must be have bad fuel economy and i have verry good economy.+30% economy of fuel!I'm going crazy!
My car is opel corsa 1,4 16v 2003 mod with maf sensor. delphi ecu.
Thanks

[stam525]

I think the problem maybe is dirty fuel injectors!
Or some problem in fuel system delivery.
What do you think?

[stam525]

Hey guys where are you?
Some answere?
You don't have some idea?

[stam525]

! hey guys hello!!

[myoldyourgold]

Hellooooooooooooo. Your problem is taking some time to research and consider. So be patient. If this was a normal problem that many have experienced before the answer would be there in a minute. This is not the case so some research is in order. That takes time which some of us do not have a lot of.

One thing is that with the use of the EFIE what you read from the OBD port might be distorted because of the EFIE. I know this to be a fact in some cases. I am not sure if it effects the long and short term trims and do not think it does. Research is needed to be sure. When one of the vehicles with an EFIE visits me I will check it but this will take time because I have no vehicles with EFIE's in California where they are illegal. One will have to come from another state which happens only every so often.