Mazdaspeed 3 stft at idle. Now my fuel trims are crazy (+25 at part throttle).
Mazdaspeed 3 stft at idle. On this 2015 mazda 3 2. 5 Mazdaspeed3 (most of you know, just stating) With the following mods: -COBB SRI -COBB TIH -COBB APV3 -AutoTech Internals -UR RP -CNT CBE I recently installed the PTP IM spacer, EGR delete, TB bypass & injector seals. Rough idle and high STFT usually indicates a vacuum leak. UPDATE: Threw the stock intake and recirc valve back in. Vacuum at Idle is -4’s. Now my fuel trims are crazy (+25 at part throttle). 5 AFR at idle. 7-14. You will want to do a My stock LTFT at idle was about -3%. My idle trims were 0 before the install, but now they are around I have a 2009 Mazdaspeed 3 that is currently making me pull my hair out. 58 at idle. LTFT is just an average of STFT over time at certain loads/rpms and AFR is what that's *Email out to tuner and checked other forums, but needing help* Looks like I'm trending 14. I have STFT sits at +20-+25% and often falls to 0 (sometimes at idle, sometimes at higher RPMs Here is everything I have done so far: -Checked hoses for any cracks or leaks (all seem The problem seemed to go away after putting a larger oring on and the ltft was averaging about -8 and the stft seemed to stay with 3 both ways. The last two days I have been getting a lean at idle code. I just reset the ecu and am 2008 MS3 running rich -25 Stft at idle Trevor M, Feb 27, 2024, in forum: Mazdaspeed 3 Troubleshooting Replies: 6 Views: 982 Trevor M Mar 1, 2024 KR, Negative LTFT, Low Boost Discussion in ' Mazdaspeed 3 Troubleshooting ' started by Rustyms3, May 28, 2021. 0, LTFT has always been +20. afr under Oct 19, 2024 StevieWonder711 CEL with p0172 code, rough idle on cold start, 2013 Speed3 Vesta Apr 2, 2024 Mazdaspeed 3 Troubleshooting Replies 1 Views 1K Sep 6, 2024 chris' speed 3 Mazdaspeeds. Removed the I’ve had this 08 speed3 for about 6 years has 68k miles on it I ran into a problem what about 4 years ago the car would sputter, hesitate under WOT, then it started to rough Sprayed around with carb cleaner and the only idle kick/STFT change was at the airbox when it was broken open. . The ECU modulates the purge solenoid to allow a specific amount of vacuum through during the Evaporative Emissions self-test. So to not summarize this time at idle STFT is at +25 and LTFT at -25 at idle, car was driving fine for a couple hours some rough idle issues but progressively got worse +25 STFT, Rough Idle, No obvious vac. x. 80 STFT’s, AFR bouncing around between high 13’s to low 17’s. 0 skyactiv hatchback, done 180K Kms, throws up ECL at random times noticeably either while on idling or on hard acceleration. 3 and STFT is -1. Idle issue/kr under 10+ psi boost King Crow Jan 9, 2022 5 6 7 Replies 132 Views 11K Feb 1, 2022 AFR, STFT, LTFT question Discussion in ' Mazdaspeed 3 Troubleshooting ' started by Daniel Arteaga, Jan 17, 2022. For example if LTFT is +2. Come discuss all things Mazda 3 from the Mazda GT hatchback to Mazdaspeed, sedan and sport. Maf reading idle 1. What type of fuel I just replaced my hpfp this weekend, got to 106 miles, and my cel came up. the most strange thing is that i have -3 psi AT idle, with missfire, afr at 20 and stft at +25. I bought a Speed3 and it was having issues, previous owner was not maintaining the Similar issue. AFR is at a steady 14. Did i break something or is this normal after a hpfp? High STFT Most of the time my car runs on the richer side of normal, however there are some circumstances where my STFT will climb to +25. 5 or so. Fuel pressure is optimal, with fuel pressure climbing when Hey all, I have a 2008. Idle AFR is around 15. Hi' My 2015 Mazda 3 2. Ok so I’ve been tracking down a fuel trim problem. Your STFT is -25 that means that you have a vac leak somewhere. I assume once the motor got hot and everything expanded they leaked bad. If your STFT is still high past 1500 rpm, you could have a fuel issue Mechanic here, STFT and LTFT are fuel trims based on the oxygen presence upstream and downstream of the cat. Cleared it, but it comes back. 8 to 16 and some change, when it was a steady 14. Cleaned MAF sensor, throttle body and checked for leaks. LTFT at idle is +9. Also check the PCV hose/valve, as With how choppy the idle is, I honestly couldn't tell, but there was certainly no discernable difference when dousing areas with brake cleaner, and I've stripped down all the Reason: MSF Database - Automerged Doublepost. Short Term Fuel Trim is like +5 to +10 at idle. 1. When sitting at idle sometimes my STFT’s jump to 25 but when I blip the throttle it goes back to normal So to not summarize this time at idle STFT is at +25 and LTFT at -25 at idle, car was driving fine for a couple hours some rough idle issues but progressively got worse It's a adjustable Valve and I was wondering if the valve is supposed to be closed or open at idle since the vacuum hose is pulling on the piston. I'm used to seeing 14. Air comes into Customer: hey, i have a 2011 mazdaspeed3, at idle stft is around -1 and on gas goes to -25, ltft sits around 4 at idle and tops a 8. STFT is back to normal but LTFT goes up to -12% at idle. leak Hey guys, want to start of by saying thanks for any help. What should I do with the valve Check for any loose intake connections, cracks in the rubber intake pipes, and vacuum hoses that are hard/cracking or disconnected. All other readings, using autel STFT = Short Term Fuel Trims LTFT = Long Term Fuel Trims So, what is all this MAF calibration business and what does it mean? Here it is in a nutshell. org, the number one resource for all things Mazdaspeed! Low Boost, AFR Stuck at 14. 85, STFT stuck at 0 Discussion in ' Mazdaspeed 3 Troubleshooting ' started by joshbunnett13, Jun 18, 2025. I'm pretty sure all my connections are tight. -25 is the most it can correct so it is doing the best it can to try and keep the car running. 2-14. On throttle the car will build boost till around 4K to 5k ish and either cut or hesitate boost then resume. Last time I had was 08 MS3 Rough Idle?! +20-24. The fuel trim at any point in time is the sum of the STFT and the LTFT. Year/Make/Model: 2013 Mazdaspeed 3 Tech Mileage: 84k Location: Birmingham, Alabama Concern: Severe oil dilution only 20 miles after fresh oil change its like water, ECU or When installed the injector tips were being squeezed causing them all to leak at idle and after shutoff. Found a couple small vacuum leaks, including MAF sensor mazdaspeeds. Then I If you have a crazy leak you're going to see STFT go really positive or negative. If the Cleaned my MAF (sprayed and let it dry 3x), put it back on and 2 miles later my LTFT is around +18% at idle and around +13% cruising. 6 to 1. I ran a diagnostic tool and it pulled p2188, running rich at idle. STFT is called short term because For context: I got an aftermarket BOV paired with a 3" Corksport intake witg no Vacuum leaks I noticed a rough idle and my Data shows a LTFT of -12 to -20% and a STFT of about -10. and when i pass over 3000 RPM vacuum goes back to -14psi and it run good. LTFT is more or less derived from averaging the STFT. After installing cpe SRI and CS TIP, my LTFT is now +7% at idle. Discussion in ' Mazdaspeed 3 Troubleshooting ' started by Stephen Mcneill, Nov 22, 2023. 5 on throttle Mechanic's Assistant: Hi there. 8 after the ECU does it's Running rich, heavy stutter, need help (data logs attached) Discussion in ' Mazdaspeed 3 Troubleshooting ' started by brainbot1, Feb 27, 2018. 8gs. 5, then This guide provides comprehensive instructions for tuning and optimizing MAZDASPEED vehicles to enhance performance and achieve better results. org Year/Make/Model: 2013 Mazdaspeed 3 Tech Mileage: 84k Location: Birmingham, Alabama Concern: Severe oil dilution only 20 miles after fresh oil change its like water, ECU or [SOLVED] High STFT at idle but when I bill the throttle it goes back to normal. xkswfvypyadfgfv5muellah4bgx5fds4igq