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Showing results for tags 'Fuel Trims'.
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Hi All, At my wits end and need some help! My XR6T (2007) is drinking fuel and running rough and engine light on. Checked out the obd2 and had no voltage on O2 sensor 1. Pulled it out and its covered in carbon, replaced it and has helped as car is now at least back in closed loop mode. No engine light now. However Long term fuel trim is up at + 25 on idle so it is still lean (Or thinks ts lean) at idle and as such is running rough. When I take it up to 3000 rpm etc the fuel trims come back down and look to be fine. So im thinking its a vac leak and have spent the morning spraying carb cleaner over everything, and have been blowing cig smoke into vac hoses with a glove over the throttle body to try and find the leak. No luck! cant find the dam leak anywhere. Wondering if there is another way that I can assure myself that the Vac is good. I dont want to cancel it out just because I havnt been able to locate it. How can I assure myself that the vac is fine? In the event that it isnt a vac leak im Wondering what else would drive the fuel trim to do this? from What I understand a bad MAF would do the opposite so I'm cancelling that out. I have had my bolts on turbo manifold loose previously so am about to go see if they need nipping up? Would Exhaust leek drive same behaviour on the fuel trim ? I have also changed plugs, and coils about a yr ago. Appreciate any help! cheers Guys. Pete
