shoeys08dkcandygt

Need some help guys. For the last few months I've always thought the car wasn't running like i should. Checked a scanner here at my work and the short term fuel trim was +10-13 2 months ago. Took to ford and.was told nothing was wrong. And to wait for a light to come on. Fast forward to today and my shop foreman and I just checked the live data abs the long term fuel trim is +24% and the short term is -2% is it a vaccum leak or something else? Car is tuned by steeda and runs good just feel like its not running what ot can. Esp down in the low rpms. and I checked the spark plugs they are all clean and look alike. Even the #8. So thr motor is good just not making the power it should bc its throwing extra fuel at it. Thanks for any help or suggestions you guys have.

siggyfreud

Gather some datalogs on some 2000 rpm+ runs in the highest gear you can and not terribly exceed the speed limit by the time you reach redline. Post them up or send them to Steeda for their review.

shoeys08dkcandygt

So 3rd gear from 2000k-redline which is 90mph. Thanks. Bout to just wait on the light to come on see what it says is the problem. Just tired of waiting on the light to come on

SteedaGus

Vaccuum leaks are unlikely although there are some of us out there in the tuning community that have seen the fuel trims be off by quite a bit even on a stock car.

Had you datalogged your car at all with the stock airbox? If your fuel trims are off with the stock airbox and stock tune then something is wrong, but if it falls within the range that it wont set off the check engine light the Ford dealer will probably not do anything for you.

We can resend you a tune we know is right for a properly running car. If it is still off you should datalog the car with the stock airbox and see if that is off too.

Ideally trims should be + or - 5% or better.

shoeys08dkcandygt

B1 is at +18% and b2 is at +10%. I saw it about 2months ago and the positive numbers were only in the short term and hadn't gone to long term yet. And that was with the stock airbox on it. It has felt off since then. Gus I called u from the dealership bc u were the first to say that I had a o2 sensor that was slow.to respond which it was and ford told me 'no problem found and to bring it back when a light came on. Still no light to this day but it doesn't seem to pull like it should. Esp tuned. Gus can I call u at steeda tomorrow and talk about the tune? Are you busy tomorrow?

shoeys08dkcandygt

No vacuum leak. be back to figuring out of its a o2 sensor or a bad cat tomorrow. Plus hopefully talk to Gus and get his input