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Long Term Fuel Trim High At Idle - Monterey Craigslist Cars And Trucks By Owner

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A rich condition will cause the engine to run with a hesitation or have a nasty smell at the tailpipe and could be caused by spark plugs that are fouled out, a fuel injector that is leaking, or a fuel pressure regulator is stuck on high pressure. Nonetheless, as a rule of thumb, long-term fuel trim values that hover around the 5 to 8 percent mark – either negative or positive- are not necessarily indicative of a problem. Fuel trims to correct a rich or lean condition. Still runs great, feel wise. Im putting this down to denser air because its approximately 15 degrees C cooler then when I last tested. If the engine is burning more ethanol than the FF_INF value suggests, it will set lean codes. I did run the old AFM without the bung for a long time though. While continuing to be "on the bench" every day, Jeff is also heavily involved in government focus groups, serves as an accomplished technical writer and has competed in international diagnostic competitions as well as providing his expertise as an automotive technical instructor for a major aftermarket parts retailer. High LTFT at Idle. - ScannerDanner Forum. Please note that I have a 2 month old AEM wideband sensor that is hooked up to the ELD pin on the ECU, as you can see in the calibration, if you wanted to view this data alongside the factory primary O2 in your own logging template. Low fuel pressure will cause P0171/P0174 codes, just the same as a mass airflow system. At idle, my long term fuel trim reads 7.

What Causes High Long Term Fuel Trim

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. You should see a significant drop in STFT when you block off the right component. If nothing appears cracked, beaten, abused or misused, the next step is to determine if the lean condition is caused by a vacuum leak. Here's some other info i got from my drive this morning: Hopefully someone out there has seen this before - I've been lurking here for a while, but finally decided to turn to y'all for help! It's important to note that unmetered air can also enter the intake through the crankcase via the PCV system. Fuel trim for diagnostics | Vehicle Service Pros. A couple of common culprits for this are the seals in the valve cover that seal around the variable cam timing solenoids, and the dipstick seal.

What Does High Long Term Fuel Trim Mean

Spark plugs (NGK, gapped by me). If there's a considerable change in the value, I know I have a contaminated MAF sensor. Not Allowed: to reply. Join Date: Apr 2011. 9V, and at 30 mph from. What should i check? During idle the STFT is between -11 to -1. I'll retest though, as it's fairly easy to do, just need to buy some more baby oil for the smoke machine.

Long Term Fuel Trim High At Idle Bank 1

As the vehicles went into the cruise portion of the test drive, the exhaust flow slowed to the point the restriction in the exhaust had no effect on the engine operation. I currently own a 1996 Toyota Corolla with a 1. The exhaust stream is monitored by an oxygen sensor upstream of the catalytic converter, and the signal voltage it generates is directly proportional to the oxygen content of the exhaust stream.

Long Term Fuel Trim High At Idle Temp

What exactly was blocked off? If it is a MAP engine only, a vacuum leak would normally cause a high idle speed. When we smoked the intake we found that the smoke was coming from the intake manifold runner control (IMRC) shaft that ran through the intake. Car was stumbling and stuttering for a while with +10 LTFT and a low MAP. They may just be narrowbands, but can still give useful info. THANK YOU and a big happy 4th of July! I'm not sure what it is, but I think it's either clogged fuel injectors or a vacuum leak somewhere. Fuel Trim: Finding a Vacuum Leak and Performance Issues Using Fuel Trim Data | Auto Service Professional. Obviously this suggests vacuum leak.

What Should Long Term Fuel Trim Be At Idle

Basic Mass Airflow Strategies. First, let's review what fuel trims are and how the fuel system monitor works. At 2500 RPM my STFT goes back to the -11 to -4 range and my LTFT improves to 0-8 but only when I accelerate. 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. Long term fuel trim high at idle temp. If the Map reading was shifted then it would read lower than the real value, given your concern of positive fuel trim. One last point, I think the exhaust smells rich. An incorrect MAF sensor value could be due to its reacting to a vacuum leak, a miss or pretty much any driveability issue. You must be logged in to reply to this topic. Join Date: Dec 2014. Barely loose, just enough as to not pull at the throttle body. I have looked for a vacume leak using brake cleaner and smoke in the engine.

Negative Fuel Trim At Idle

The van was parked outside overnight to allow a cold start. That's what the fuel trims will be trying to do, assuming the o2's are reading correctly, and working correctly so the ecu can make changes. Im guessing this is because the thinner air on a hot day translates to a slower idle speed on a MAP system?? What causes high long term fuel trim. This causes a temporary instant rich in the system since it has now bled off all the metered air. That mist goes everywhere. This seems to go up in line with the intake air temperature. Leaking injectors, broken fuel pressure diagrams, improper fuel pressure and skewed sensor readings are a few examples of issues that could result in a rich running condition. Determine whether the condition started shortly after the customer filled the tank.

What Would Cause High Long Term Fuel Trim

The ECM cannot do anything about the relationship of air to the amount of fuel, but it has everything to do with the amount of fuel delivered in relationship to the air entering the engine. In both strategies, the weight of the air entering the engine must be calculated (as opposed to volume) so the Engine Control Module (ECM) can supply the correct amount of fuel (also by weight) to efficiently power the engine. STFT adjustments happen almost immediately, but these changes are just temporary. 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.

The maf was changed by the previous owner a year ago when the air-oil separator was changed by clearly a slightly dodgy garage - those plugs should have been 3montys old and the coils were clearly not new. If the condition exists in all rpm ranges, then the cause is more likely a fuel supply issue caused by low fuel pressure, restricted injectors or a defective sensor input from a MAF or engine temperature sensor. Plug back in when done, reset computer. Some aftermarket Blow off valves that you see sometimes do not recirculate and VTA vent to atmosphere. Finding a known good one might be a bit tricky though, needs to be the right car and nearby too! As we discuss the fuel/air management systems, I would like to present a few things I have found that simplified the understanding of how they work. When you're viewing o2 it in closed loop or open? Spark plugs were a good colour if a bit worn: Fitted new plugs and coils all round.

Rather, I try to encourage technicians to learn the theory of operation for their specific system and then apply the theory to the problem they are facing in their bay. I recently worked on a 2002 Crown Victoria that would start but wouldn't stay running due to a contaminated MAF sensor. One thing I did read was about stiffer engine mounts causing the knock sensors to think there was knocking and pulling timing. Now that you've verified that the DTCs are P0171 and/or P0174, and the fuel trims exceed the threshold, it's time for a visual inspection. Note also that fuel trim values should only be taken when the engine had been running at the above speeds for at least 30 seconds. 4 engine as it is on a GM 4. A lot of MAFs are replaced because they fail the 'unplug it' test, where in actuality unplugging the MAF results in the pcm utilising MAP sensor readings instead, creating a richer running condition for safety and bringing all the fuel trims back into line. The MAF value often reflects its reaction to the concern, without actually being the cause of the problem. On a V-style engine you can isolate which bank is running rich or lean by watching that bank's fuel trims. I tried to remove the dip stick to check the integral positive crankcase ventilation (PCV) valve in the cam cover for an issue and the cause of the problem was uncovered.

The FF_INF value shows us what the PCM has determined the FF percentage is; we must now check the fuel using the following ethanol water test: •Fill a 2-liter soda bottle less than halfway with water and mark the water level on the outside of the bottle. 5% with AC off and AC on. The primary purpose of downstream oxygen sensors is to monitor the efficiency of the catalytic converter, which is accomplished by means of the ECU comparing its signal voltage to that of the upstream oxygen sensor. The trims will also work this way for a leaking purge solenoid or leaking fuel pressure regulator, since there is an excessive amount of fuel that is not accounted for by the PCM calibrations. I shut off the engine and installed a fuel pressure gauge to investigate the hard start and rough running, being suspicious of a leaking fuel injector (the STFT was a clue to this as well indicating rich). If there is an air leak in the air intake system any place between the sensor and the intake valves (air boot, leaking vacuum lines leading to the intake manifold or leaking intake manifold gaskets are just a few possibilities), the fuel trims will show a positive number at idle.

1 is a 2001 Ford Ranger powered by a 4.

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