Western Branch Diesel Charleston Wv
Dude obviously HAS NO CLUE!!! It does not seem that fuel trim is your issue. Fuel filter or fuel pump would cause opposite. 21 means 21 percent less fuel than base trim for that cell. Is my ICV going bad? In this case, STFT at idle was approximately 223% and LTFT was 24%, for a total fuel trim calculation of 227%. It is constantly compiling the data to arrive at the long-term fuel trims.
Disable the canister purge solenoid in case of a flooded canister and see if the LTFT and STFT come down into the range of 0% plus or minus 10%. Long term fuel trim not changing. Engine temp seems to rule out a failing thermostat. Fuel trims on 06/08/18 at idle after a 30 minute mixed highway/city drive were: RPM: 656. Replied by SailorBob on topic 2 Engine Banks have nearly fixed opposite fuel trims OK, I've got some more definitive results. Fuel trims move to positive side with increase in RPM.
If this had been an OBD II vehicle, I would have had the information in under 30 seconds. A tuner friend of mine hooked up HPT and said that I had short term fuel trim values between -0. This is typical of a dirty MAF sensor. Short-term fuel trims are considered ideal between the 10% positive and 10% negative range. 129 and higher is lean, 127 and lower is too rich. Your car's fuel system is a carefully choreographed ballet. After 2 or so minutes, TRA1 went to +0. This is when codes are set for a too rich or too lean fuel trim. Long Term Fuel Trims Stuck. STFT will normally begin at 0% and adjust to the current conditions. Thus, put simply, fuel trims are the continual adjustments an ECU makes to fuel delivery strategies to keep the air/fuel mixture as close to the stoichiometric point (also known as Lambda = 1) as it possibly can throughout the engine's operating range.
It is up to the STFT to make the final refinements. Since the cells I'd enter WOT from, did not have the same. Location: eureka, Ca HUMBOLDT. Bare with me, this article somewhat technical. The mass airflow sensor monitors and communicates the levels of oxygen entering the engine. We know this because the amount of fuel trim increase is greater with these injectors unplugged. No surprise to me that it reaches 50C standing still. No CEL and no Fault Code. Long term fuel trim not changing color. Took a VE measurement and got 83. The short term fuel trim was oscillating between - 0. So the ECU thinks the air - fuel mixture is a little too lean so it must add fuel to correct to bring it into stoichiometric balance at + 12. And yes, it will easily cause that much of a change to LTFT. Last edited by islaTurbine; 11-21-2021 at 07:20 PM. The ECM can only compensate so long before it becomes unbalanced and can no longer add or restrict fuel to achieve a proper oxygen sensor reading.
For some reason, a lot of Nissans are like this.