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Long Term Fuel Trim High At Idle Low

Total fuel trim spread should also be looked at and should not exceed 10% (-5% STFT plus +5% LTFT= fuel spread of 10%). When you close the throttle body while the turbo is spooling, the pressure on bottom is greater than the pressure on top, so the piston opens. Fuel trim for diagnostics | Vehicle Service Pros. Not Allowed: to create new topic. The intercooler --> throttle body hose actually seemed totally fine when I pulled things off. Replacing the fuel pump fixed the major issue of the car not running however these numbers don't seem optimal from what I've read but my boyfriend is unconcerned by them.

Long Term Fuel Trim High At Idle Vs

4% (which is the max for positive correction, if I'm not mistaken? Just to be clear - that's unplugging the battery, de-juicing it with the brakes, waiting, and then the combination of on for 29 seconds, start, idle for 20 mins? Eventually LTFT settles around -10% and STFT is trying to compensate with around +15%. Long-term fuel trims are measured over longer time intervals by oxygen -, or air fuel ratio sensors downstream of the catalytic converter, and in practice, the signal voltages these sensors generate are not directly implicated in fuel delivery strategies, although there some exceptions to this rule. High LTFT at Idle. - ScannerDanner Forum. Can you watch them do it? The LTFT is only high at idle and normal at higher revs.

Short Term Fuel Trim 25% At Idle

I currently own a 1996 Toyota Corolla with a 1. 99% sure it will fix the problem. Could this issue be caused by a leaky intake valve? Front oxygen sensor (OEM Denso). I think at 9 you should get a CEL.

Long Term Fuel Trim High At Idle Light

Let off pedal > throttle plate closes but still have pressure from boost in intercooler and pressured air in the lines post turbo. Cam deviation is 5 degrees, not bad but not great hence why it's on the list at the next oil service. At idle with the engine running in closed loop, the STFT and LTFT were both in the +20% area and the engine was missing, bucking and running rough to the point the SES light was flashing (although it hadn't set any misfire codes). Just things I would check before I spent any deal of money. I'm going to go and have a good look at the sensor. LTFT is a slower reacting PCM-based calculation that has no direct relationship to an exhaust sensor. I had the exhaust off/on yesterday and it nothing has changed since then. In this case the idle would be low and you don't state the idle rpm are low. Communicate privately with other Tacoma owners from around the world. If the STFT shows an increasing trend, the LTFT will increase and allow the STFT to normalize and vice versa. Short term fuel trim 25% at idle. It wasn't super rich at first only posting lower 14-15AFR swings, but it eventually went back to the 12-15AFR swings. The ECM can only regulate the amount of fuel based on the amount of air it knows about. So if LTFT is +15% and STFT is +6%, the total fuel trim is +21%. But the perfect AFR isn't always best for proper engine performance and operation.

Long Term Fuel Trim High At Idle Power

STFT could be 5% and then the LTFT will start to go negative. When a petrol engine runs with a stoichiometric air/fuel mixture (14. And that's not the only way a mistake can be made. So then I suspected MAF or other input air sensor failure. Fuel Trim: Finding a Vacuum Leak and Performance Issues Using Fuel Trim Data | Auto Service Professional. Nowadays, the biggest issue with fuel quality is the addition of ethanol. ANY leaks after the MAF will cause idle issues. Don't freak out about taking the IC off.

Long Term Fuel Trim Negative At Idle

This information may show up in scan tool data and can affect overall fuel trims, but the base STFT and LTFT need to be addressed first. Please let me know what you think. As a final test, I simply went in and re-enabled the LTFT values and loaded the tune. Car was stumbling and stuttering for a while with +10 LTFT and a low MAP. You are currently viewing as a guest! I replaced the fuel pump with a used good one which has made no difference. Freeze Frame: STFT: 32. Long term fuel trim high at idle vs. You can see the adaption values climbing over a couple of hours worth of driving. Speed-density fuel management systems uses several different sensor inputs to calculate air mass. It was popping and gurgling a bit more though which would indicate the engine running rich (I think - is this right? )

High Long Term Fuel Trim At Idle

As a registered member, you'll be able to: - Participate in all Tacoma discussion topics. Let's look at some possible causes of the lean codes. I can't see where the hose goes either, but it seems like it goes into the intake manifold. Each of the two fuel management systems have their strengths and their weaknesses, but all in all, each of them does a pretty good job of keeping an engine running smoothly, efficiently and with a clean exhaust. It's funny that sometimes writing these things out can sort of help lead to to the problem. 1 At idle, the LTFT always goes deep into negative numbers trying to pull fuel. I know there is a pressure sensor on the ECU for altitude adjustment but I don't know how to access it. •If the fuel correction decreases at least 15% at 2500 rpm, you have a vacuum leak. High long term fuel trim at idle. The tool says my O2 sensor is functioning normally and EVAP is ok. The car did have a new timing belt before I owned it. Be it the brake booster line as well, even these can leak internally. The use of a turbocharger changes the way an intake leak will affect fuel trim.

Closer to zero the better, if its nearer to 10 then stop trying to fix the problem... you need a rebuild. This means a miscalculation that results in too little fuel being added for the actual amount of air that has entered the engine. Always familiarize yourself with the entire vehicle. Darkslider said: Are you 100% confident in your DIY test to rule out any more air leaks?
Sun, 07 Jul 2024 07:22:16 +0000

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