Or at least I didn't own one. Today, though, some of the vehicles with boasting ultra clean exhaust emissions are using the speed-density system, so it would be a good thing to dig a little deeper into this strategy and compare the two fuel management systems. I prefer monitoring the sensors over STFT because the they'll jump to rich immediately in response to the propane. TIP: Bear in mind that fuel trim values are only reliable if it is known that the oxygen -, or air/fuel ratio sensors are fully functional and in closed loop operation, and that there are no air/fuel metering or ignition related codes stored. So my question to you guys is twofold: 1. ) This value has changed with the predominant use of air-fuel ratio sensors that provide faster more accurate results on exhaust gas oxygen levels even during acceleration and deceleration. Long term fuel trim high at idle start. Barely loose, just enough as to not pull at the throttle body. Or is there a combination of these factors? This extra pressure does what is says goes to atmosphere PSSSSH!!! Flex Fuel (FF) vehicles are made to run on as much as 85% ethanol (E85). I tested the same scanner and phone on my father's Miata, and his long term fuel trim is a consistent 0% with slight variations up and down. When it comes to diagnosing emission related diagnostic trouble codes, it is very important you are aware of what fuel/air management system you are working on.
- Long term fuel trim high at idle start
- High negative long term fuel trim at idle
- What should long term fuel trim be at idle
- Long term fuel trim high at idle capacity
- Long term fuel trim high at idle air
- High negative fuel trim at idle
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Long Term Fuel Trim High At Idle Start
However, in some cases, the displayed value for long term fuel trims can be as high as 6 to 8 percent (depending on the application) and can be either a negative or a positive number. Wait about 15 seconds for fuel trims to fully react before removing your block and moving on to the next location. Over the years I have learned to never say never and or have hard and fast rules for things. For the purposes of this article, we will assume that all oxygen -, or air/fuel ratio sensors work in the same way, in the sense that a low signal voltage indicates a lean mixture, and that conversely, a high signal voltage indicates a rich mixture. Fuel Trim: Finding a Vacuum Leak and Performance Issues Using Fuel Trim Data | Auto Service Professional. Or at least have them show you it doesn't have any leaks? During idle when the throttle plate is closed, the vacuum in the intake manifold is high and very little air flow is entering the engine, so even a small amount of un-metered air will have an effect on fuel trim. The correct siemens/VDO unit (£160 on sale) cured it all.
High Negative Long Term Fuel Trim At Idle
Fuel trim diagnostics. I did run the old AFM without the bung for a long time though. Based on your reported trims after you did that, your car was part way to learning its way right back to the high LTFT values you saw in the first place. STFT is the direct result of the feedback that the oxygen or air/fuel ratio sensors are providing to the PCM.
What Should Long Term Fuel Trim Be At Idle
Please let me know if there is some sort of Closed Loop hard relearn, or anything else that may be of value to get the Closed Loop system back to following the actual STFT values. Positive Fuel Trim, Throttle Open At Idle. I'd love as much help as you can provide. God that was a long post, hope it helps.... PS the hot side of the turbo is the Exhaust side. Exhaust restrictions can set a P0172/P0175 (System Rich: Banks 1 and 2)) codes on some vehicles, depending on how the sensor software is written.
Long Term Fuel Trim High At Idle Capacity
You can drive around like this lightly, - the ecu just defaults to a nominal value for airflow. The ECM can only regulate the amount of fuel based on the amount of air it knows about. The BPV's purpose is to vent off extra pressure from the intake tract after the throttle body closes. If it is a MAP engine only, a vacuum leak would normally cause a high idle speed. Since the pressure at the exducer is now less than the pressure in the lines currently. It uses sensors to measure or calculate airflow, consults an air/fuel ratio map in its permanent memory, then chooses the correct injector pulse width (the amount of time the fuel injector will stay open) to match that airflow. Fuel trim for diagnostics | Vehicle Service Pros. Short-term fuel trim values on the other hand, often deviate by as much as 10% to either side of 0% when the engine is running at a steady speed, which does not necessarily indicate a problem. Post the calibration as well as datalogs showing what you are describing. Noticed that WOT pulls in 1st and 2nd gear had super rich AFR hesitation at ~5750-6250RPM. When vacuum leaks were induced on each engine a big difference can be seen in the two fuel management systems. So it's clear that without the closed loop values enabled the car runs perfectly. Don't be a parts changer!
Long Term Fuel Trim High At Idle Air
Avoid using carb cleaner. It's important to note that unmetered air can also enter the intake through the crankcase via the PCV system. When the throttle blades cannot control the engine speed, the fuel injectors are turned off by the PCM. Letting go drops it to 1. This is a consistent reading I'm getting over the span of two days.
High Negative Fuel Trim At Idle
Airflow as far as I can see is being well reported but it only needs to be a bit off to cause the issues I've been experiencing: This is the log straight after fitting the replacement fuel pump. Don't clear the DTCs yet. Such as hoses and injector orings. I believe that during idle, the BPV can be slightly open, so plugging it could cause the MAP to behave like it did. High negative long term fuel trim at idle. When you're monitoring the MAF sensor, using the correct specs for the engine, keep in mind that even a small amount outside the specified range will cause an issue. I like to record MAF sensor values at idle, clean the sensor with a MAF sensor cleaner, then recheck the values.
The vehicles that come to our shops use one of two types of fuel management strategies: speed-density or mass airflow as measured by the mass airflow (MAF) sensor. I should make clear that it's not running really roughly, just a bit lumpy and lacking a little bit of pep. 6L three-valve engine and a vacuum leak. NOTE: On some applications, most notably some GM products, the oxygen sensors are electrically opposite, meaning that a low signal voltage indicates a rich mixture, as opposed to the lean mixture it would indicate on most other applications. Air filter (OEM Toyota). Even some in-line four cylinders have two sets, one per cylinder pairing (cylinders 1-4 and cylinders 2-3 t ypically). Here are two examples where fuel trim assisted in the diagnostic direction and repair. High negative fuel trim at idle. You must be logged in to reply to this topic. Finally, remember to clear the KAM after all driveability repairs are completed. Please let me know what you think. I don't know a ton about cars but I can Google and read.
No matter what numbers I put in the fuel trim fields (except all 0's), it always does what you saw in the logs at idle. What do the plugs look like? I have tried with every possibility including the stock values. An expert is someone who knows each time more on each time less, until he finally knows absolutely everything about absolutely nothing. •Let it stand for about two minutes. You want to see the big picture. Still runs great, feel wise. That doesn't mean everything is ok as you have seen its there to protect the engine. If a turbo-charged engine has a vacuum leak after the throttle plate, the fuel trim numbers will be positive at idle (like a non-turbo engine), when there is no boost and a vacuum in the intake. Join Date: Dec 2014. The fuel trims will react with a negative value. EDIT: I've actually been logging data using my bluetooth scan tool and the car scanner app - highly recommended. This condition can cause the converter to become super-heated, beyond the normal operating conditions that a converter was designed for, resulting in damage to the internal substrate. The van started and ran smoothly, and the fuel trims were checked; STFT was +3% and LTFT was +2% for a total of +5% just fine for this vehicle, and providing a good exhaust gas for the new converter to function.
Everything is near perfect, especially idle hovering dead on at 14. Lean conditions will cause the engine's temperature to rise and could be caused by either a loss of fuel pressure or the injectors are not spraying properly. There's no reason the ECU should be pulling any fuel at idle if the base map is set perfectly so that it idles at 14. NOTE: Some scan tools may display fuel trims as Lambda = X, where "X" may be a number greater or smaller than "1", with "1" representing a stoichiometric air/fuel mixture. And you will notice that the rich periods perfectly match the S02. The computer uses both to meter air/pressure.
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