Is it possible for a splice fuel injector wire to cause a negative short term fuel trim on bank 1 and bank 2 ?
2011 Toyota Highlander SE V6
I wouldn't think so because if the splice were faulty it would cause an Open in the circuit, or conversely it the splice was somehow creating high resistance in the circuit, both conditions would result in no or lower current to the fuel injector (less fuel) and that would result in a Positive STFT not a Negative STFT.
Also, you'd be getting a "Cylinder X Injector Circuit Low" code.
Anyway, you can always measure for continuity (good) or high resistance (bad) in that spliced wire.
I was just wondering because the rodent ate through my fuel injector connector, a whole ignition coil connector, camshaft sensor connector, and one other connector. So I’m trying to figure out which part is causing a negative short term fuel trim on bank 1 and bank 2
How high are the negative STFT's?
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If mr. rodent gnawed through a sensor wire you'd expect to see a circuit trouble code for that sensor/component
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What do the LTFT's look like?
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Also, what happens to those negative STFT's (during idle) if you hold the engine to over 2,000 rpms for a minute or so? Do the STFT's go closer to 0 or do they increase or stay the same?
Ltft are all at 0.00 no negatives on them and stft bank 1 is -6.3% and stft bank 2 is -3.9%
And stft B1-S2 99.2% and stft B2-S2 is also 99.2%
Ltft are all at 0.00 no negatives on them and stft bank 1 is -6.3% and stft bank 2 is -3.9%
And stft B1-S2 99.2% and stft B2-S2 is also 99.2%
Not sure what it was like when raising the rpm cause I shut off the car when I saw that it had a negative, everything was all good until it ate through the wiring’s
But I spliced all those wires that it had went through, so I just ordered new connectors for all that it ate through so was going to try and do it again and use the butt connectors
Those stft B1-S2 99.2%, and stft B2-S2 99.2% are normal
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That's just what the scanner displays for those downstream O2 sensors because they aren't used to calculate the fuel trims
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Your upstream ones aren't really all that bad. Anything between +5 and -5 are considered OK. Your -6.3 is a little too high
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https://support.bluedriver.com/support/solutions/articles/43000551799-why-is-fuel-trim-n-a-or-99-2-
So possibly could be my O2 sensor
Not likely because both upstream O2 sensors are showing a rich condition . What are the odds they both failed at once?
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See what those STFT's do when you raise the rpms like I suggested
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You may just have a leaking Purge Valve or a dirty MAF sensor or maybe your ECT sensor is failing
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Not too many things will cause Negative fuel trims. Even fewer things will cause them on both cylinder banks at once
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For example a leaky fuel injector will cause negative fuel trims on 1 cylinder bank but what are the odds that 2 fuel injectors on opposite cylinder banks started leaking at the same time? Not likely
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See what your MAF sensor is reporting at idle. Look at the ECT and IAT sensor values also to see if they seem reasonable.
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I did as you asked on raising the rpm and recorded a video of what it showing, is there any way to post a video
upload your video to youtube and then copy and paste the youtube video link in your next post
I did as you asked on raising the rpm and recorded a video of what it showing, is there any way to post a video
See the Read this first post at the top of the topic list.
