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Old 10-26-2019, 03:57 PM   #1
mototruxxxman
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Engine Hesitates until 3200, then takes off

1988 Si OBD0 5-speed.

I had a CEL for O2 sensor so I replaced it & reset the ECU. Then I started it and warmed it up, then I drove the car around to make sure the code was clear. No more CEL.

New Problem:
When driving, the engine seems to massively lack power now matter how deep I push the throttle. Then, at ~3100 RPM's it takes off like a rocket.

I am considering the following as possible problems:
- TPS calibration.
- Ignition timing.

What else?
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Old 10-26-2019, 04:57 PM   #2
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I calibrated the TPS and set the ignition timing and still getting the bogging until around the 3k RPM mark. ☹️
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Old 10-27-2019, 08:28 PM   #3
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look under your distributor cap
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Old 10-27-2019, 09:37 PM   #4
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Old 10-28-2019, 12:13 PM   #5
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What brand of o2 sensor did you use? People have reported problems with using Bosch sensors in the past.
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Old 10-30-2019, 07:06 PM   #6
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This happened to me when I had my O2s mixed up, number 1 plugged into connector 2, etc. Most likely a sensor issue, don't give up! It's gonna be something simple, these cars are especially sensitive to bad/weird O2s. I have an 89 si for reference. Good luck!
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Old 11-05-2019, 10:34 AM   #7
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spark plugs may be a good simple option too if the engine had been previously running rich from a faulty O2 sensor.
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