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Old 02-09-2017, 11:08 PM   #19
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Originally Posted by Bluevitz-rs View Post
I don't know why but I had it set to 850us. That would explain the long cranking and poor throttle response when hot. Moved it to 526us. I'll have to check my fuel trims now. Did it just before rushing out to work.
Where and what are you using to adjust this?
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Old 02-10-2017, 01:00 AM   #20
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Where and what are you using to adjust this?
AEM FIC
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Old 02-21-2017, 12:16 AM   #21
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I've switched over to the 1NZ blue injectors a few months back and was running fine without issues.

I recently installed a used muffler and have been using it for over a month now. I did noticed a noise usually when RPM is below 2k. Could this noise be that the fuel mix is running lean? maybe the ignition timing advancing/retarding?

Strange that this noise did not occur till the muffler change. Any thoughts?
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Old 02-21-2017, 02:50 AM   #22
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Could it be a bad mufler ?

Switch back and check
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Old 02-21-2017, 07:57 AM   #23
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lol I don't think it is the mufler. Could it be possibly a faulty injector? Is there anyway to check?
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Old 02-21-2017, 08:37 AM   #24
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Link to a comparison post I made.
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Old 02-21-2017, 11:03 PM   #25
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but what if there are no signs of physical damage?
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Old 02-21-2017, 11:13 PM   #26
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Upgraded 1NZ injectors

Were they used and flow tested? .. or just used and not tested?
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Old 02-21-2017, 11:48 PM   #27
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Used, not flow tested. They all work fine. If i started it and there was signs of misfire or hesitation I would have pulled them out again.

I did clean them with carb cleaner and compressed air before installing them.
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Old 02-21-2017, 11:54 PM   #28
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On my NHW20 Prius, supposedly if I put it in maintenance mode, the ecu can learn new fuel trim. I've never verified this...not sure if the 1NZFE cars have that capability... or it works if I swap injectors.
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Old 02-22-2017, 12:00 AM   #29
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Yeah the ECU is continuously learning. Depending on what year the car is and what ECU it runs depends on how fast it learns and how much range of control it can compensate. Mine's an '05 and STFT can go + or - 20%. I think the newer cars have a bit more control than that.
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Old 03-19-2017, 02:34 PM   #30
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@ fluxtasy

Did you check the solenoid resistance cold on the injector ? 14ohms cold if i remember correctly .
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Old 03-20-2017, 05:33 AM   #31
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@ fluxtasy

Did you check the solenoid resistance cold on the injector ? 14ohms cold if i remember correctly .
Actually I've just found out the culprit for the cause. Previously was using another brand of Ron 95 fuel and have now switched over to Caltex and no more knocking noise!

Unbelievable but that previous brand of fuel was superior to the others as they had the lowest sulfur content but now they have compromised quality for profits.
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