LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

94 z28 lt1 shuts off

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Old Jul 14, 2016 | 08:10 AM
  #31  
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Re: 94 z28 lt1 shuts off

Would you care to tell us the model and manufacturer of the scantool?
Old Jul 14, 2016 | 10:11 AM
  #32  
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Re: 94 z28 lt1 shuts off

Just to emphasize the importance of reading the codes FIRST, this is what the code description for DTC 46 indicates:

DTC 46 will set and the engine will stall if the proper signal is not being received on CKT 229 by the PCM after 1.7 seconds.
CKT 229 ia a dark blue wire from the theft deterrent module to the PCM pin A25, and supplies the 50Hz signal the PCM is looking for in order to enable the fuel system.

DTC 46 does NOT turn on the SES light.

Last edited by Injuneer; Jul 14, 2016 at 10:14 AM.
Old Jul 14, 2016 | 10:46 AM
  #33  
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Re: 94 z28 lt1 shuts off

when I scanned it, it was set on the year 1991 and that's the code I got with it DTC 47, when I realized it was on the wrong year I changed it to the year of my car 94, the reader keeps saying to check cable and now will not connect, just at work will check make and model of the reader after work
cheers
Old Jul 14, 2016 | 10:47 AM
  #34  
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Re: 94 z28 lt1 shuts off

Originally Posted by Injuneer
Just to emphasize the importance of reading the codes FIRST, this is what the code description for DTC 46 indicates:



CKT 229 ia a dark blue wire from the theft deterrent module to the PCM pin A25, and supplies the 50Hz signal the PCM is looking for in order to enable the fuel system.

DTC 46 does NOT turn on the SES light.
it was DTC 47, don't know if that matters
Old Jul 14, 2016 | 03:23 PM
  #35  
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Re: 94 z28 lt1 shuts off

DTC 47 indicates the knock sensor module is missing, or circuit is bad. But if you had the scanner set to the wrong year/engine, it may not be valid.

Answer Gary's question. We're trying to help, but you have to cooperate.
Old Jul 14, 2016 | 08:34 PM
  #36  
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Re: 94 z28 lt1 shuts off

ok just got home from work the code reader is innova 3120
Old Jul 14, 2016 | 08:36 PM
  #37  
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Re: 94 z28 lt1 shuts off

and its got 12 pins
Old Jul 14, 2016 | 10:09 PM
  #38  
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Re: 94 z28 lt1 shuts off

Innova 3120??? Now where have I heard that before... Oh yes, I wrote a scathing review on it. It won't work on your car despite what anyone says.
Innova 3120d OBD1/OBD2 scanner - review - ECM/PCM Product Reviews - Firebird Nation

I found a work-around to reading the correct trouble codes but it's a bit tedious. See the above topic, posts 6 and 7.
Old Jul 17, 2016 | 04:27 PM
  #39  
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Re: 94 z28 lt1 shuts off

got it all back together with a new optispark, hasn't shut off yet but now my car is overheating, it didn't overheat before so now what
Old Jul 17, 2016 | 04:30 PM
  #40  
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Re: 94 z28 lt1 shuts off

Sounds like the air hasn't been fully bled from the cooling system.
Old Jul 17, 2016 | 05:47 PM
  #41  
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Re: 94 z28 lt1 shuts off

Originally Posted by donkey77
got it all back together with a new optispark, hasn't shut off yet but now my car is overheating, it didn't overheat before so now what
Did you fill it correctly?
Old Jul 17, 2016 | 06:09 PM
  #42  
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Re: 94 z28 lt1 shuts off

forgot about the bleed valve its all good now, took it for spin ran strong didn't shut off once, so i'am hoping this has fix the problem, I'll take it for a longer ride tomorrow,
thanks everyone for your help
cheers
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