C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

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Old May 28, 2023 | 02:55 PM
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My 89 6 spd is in open loop and wants to stay there. New O2 sensor. I checked the voltage in the engine bay. The voltage is in spec. New rebuilt ECM, that fixed the FP voltage problem. Does anyone have an idea what else I can do to correct this problem?

Thank you all
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Old May 30, 2023 | 01:04 AM
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SES light??? This is all the time or just sitting there idling??? Did you install some long tube headers???
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Old May 30, 2023 | 06:03 AM
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No SES light. No long tube headers.
thank you
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Old May 30, 2023 | 07:20 AM
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Originally Posted by jseremba
No SES light. No long tube headers.
thank you
Check coolant temperature sensor
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Old May 30, 2023 | 10:08 AM
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The dash says the car is at 200 degrees. Does the CTS do this ? Last time the CTS went on my 84 it burned one gallon per mile. I thought the car would run rich with a bad CTS. Because it would try to heat the car. Thank you
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Old May 30, 2023 | 10:20 AM
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Just ordered a CTS. Thank you
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Old May 30, 2023 | 12:54 PM
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Cts in front of intake is for ecm, if you’re reading the dash gauge it’s not based off cts in intake but 1 in the head. You can shoot a infared gun on the o2 if the o2 is a one wire might not be hot enough. You need 5-600f to get the o2 active. A 3 or 4 wire heated o2 should be installed. When you said you measured mv at o2 was it a fairly steady .450mv or rapidly swinging ?
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Old May 30, 2023 | 01:11 PM
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The spec said 0.2 - 0.3 off and 0.00 - 0.9 car running. It was about 0.2 car running. My car has a single wire. Can I change it to a 3 or 4 wire? Thank you
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Old May 30, 2023 | 01:48 PM
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Was the milivolt reading steady while running ? Should vary with exhaust pulses.

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can use a acdelco afs74
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Old May 30, 2023 | 02:32 PM
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Thank you so much
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Old May 30, 2023 | 03:34 PM
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I've seen some how to vids on switching to a heated o2 but don't have a link on hand. I don't remember it being difficult, switched 12v power etc.
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Old May 30, 2023 | 03:41 PM
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I didn't even know it existed. But, I am sure YT has a how to video. Thank you
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