Hello, we had that issue for a while now and the latest update hasn't changed anything.
When you start the car up, the ECU is doing a -25% short trim compensation before working alright, then on deceleration it will do the same thing making the car stalls
Any reasons or way to fix the issue ?
I tried on both 1.9.1 and 1.9.3beta
-25% Fuel trim on decel and start up
-25% Fuel trim on decel and start up
- Attachments
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- Short trim issue.fpdl
- (13.33 KiB) Downloaded 268 times
Re: -25% Fuel trim on decel and start up
Post the calibration and also list everything that has been done with this vehicle.
Re: -25% Fuel trim on decel and start up
The -25% trim is a 'learned fuel value' which is like a short term trim, except it is used after the injectors first re-start.
The value going to -25% indicates that the short term trim is pulling a lot of fuel. You fuel tables need a lot of tuning, or it could be that the o2 sensor is failing.
The value going to -25% indicates that the short term trim is pulling a lot of fuel. You fuel tables need a lot of tuning, or it could be that the o2 sensor is failing.
Hondata
Re: -25% Fuel trim on decel and start up
The car has a Rotrex C38 81 kit and the usual breathing mods, the O2 sensor seems to work correctly on normal driving and the tuning is good.Spunkster wrote:Post the calibration and also list everything that has been done with this vehicle.
While I do understand the indications of a lot of fuel removed by going -25% I know the car isn't running that rich
I would expect the corrections to behave like this before the O2 has warm up enough to work, same goes on deceleration when compensation should be 0%. I tried to get the window of correction narrower but that didn't works too.
- Attachments
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- Short trim issue2.fpdl
- (13.69 KiB) Downloaded 238 times
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- Dyno Final C38.fpcal
- (9.53 KiB) Downloaded 215 times
Re: -25% Fuel trim on decel and start up
Are you tuning this yourself, or was this tuned by a shop on the dyno?
Re: -25% Fuel trim on decel and start up
It was tuned by another shop and brought to me for a tweak, done on a Dynodynamics but the issue became present when the customer updated the firmware on its flashpro a year or so ago before I saw the car for the first time.
Re: -25% Fuel trim on decel and start up
Hello guys,
Any ideas you would suggest?
Any ideas you would suggest?
Re: -25% Fuel trim on decel and start up
It sounds like it just needs better tuning so that it is not maxing out the trim at startup. You might try starting with a factory calibration and then tune from there instead. Sometimes it takes less time to start over than to try to fix a poorly tuned calibration.
Re: -25% Fuel trim on decel and start up
For people having the same issues, it ended up being a faulty sensor, replaced it and it fixed the problem :)
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- Posts: 3
- Joined: Sun Dec 28, 2014 8:40 pm
Re: -25% Fuel trim on decel and start up
what sensor?