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No tach, car intermittently dies

This is a discussion on No tach, car intermittently dies within the General Help forums, part of the LSx Technical Help Section category; '96 Z28 LT1, tach started sitting at zero whether the car is running or not yesterday. Motor has cut out ...

  1. #1
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    1996 Z28

    No tach, car intermittently dies

    '96 Z28 LT1, tach started sitting at zero whether the car is running or not yesterday.

    Motor has cut out several times while driving and has had one long (15 sec) start.

    Car runs fine otherwise, other than the tach sitting at 0.

    CEL shows P0372

    Distributor is an MSD unit that's ~18 months old.


    Ideas?

  2. #2
    Senior Member Orcus79's Avatar
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    2002 WS6

    check the fuses first, the go from there. Any aftermarket alarms, gauges or stereo?

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    ʢ ൧ ൨ ൩ ൪ ൫ ൬ ൭ ൮Ր Ց Ւ Փ Smittro's Avatar
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    Question

    Quote Originally Posted by 77k5 View Post
    '96 Z28 LT1, tach started sitting at zero whether the car is running or not yesterday.

    Motor has cut out several times while driving and has had one long (15 sec) start.

    Car runs fine otherwise, other than the tach sitting at 0.

    CEL shows P0372

    Distributor is an MSD unit that's ~18 months old.


    Ideas?
    My manual is'nt showing such a code..(last code shown for the P0300's is listed as P0358: control circuit coil 8) Hmm strange, well I guess I'd start with check out your wire harness for damage and a Orcus said take a peek @ the fuses.. I dunno..
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    1996 Z28

    Quote Originally Posted by Orcus79 View Post
    check the fuses first, the go from there. Any aftermarket alarms, gauges or stereo?
    The tach was intermittent at first and now appears to have stopped working. The motor isn't getting spark or fuel at some point, but again, intermittent. I'll check the fuses because they're so easy but AFAIK they never cause intermittent problems.

    Quote Originally Posted by Smittro View Post
    My manual is'nt showing such a code..(last code shown for the P0300's is listed as P0358: control circuit coil 8) Hmm strange, well I guess I'd start with check out your wire harness for damage and a Orcus said take a peek @ the fuses.. I dunno..
    Are you sure you're looking at the manual for an LT1 and not an LS1?


    Thanks guys
    Last edited by 77k5; 02-15-2010 at 11:58 AM.

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    Quote Originally Posted by 77k5 View Post
    The tach was intermittent at first and now appears to have stopped working. The motor isn't getting spark fuel at some point, but again, intermittent. I'll check the fuses because they're so easy but AFAIK they never cause intermittent problems.



    Are you sure you're looking at the manual for an LT1 and not an LS1?


    Thanks guys
    My manual lists codes across the board. However Haynes has not always been known for accuracy..

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    Here ya go:

    DTC P0344 Camshaft Position Sensor Circuit Intermittent
    DTC P0350 Ignition Coil Primary/Secondary Circuit Malfunction
    DTC P0351 Ignition Coil 1 Control Circuit
    DTC P0352 Ignition Coil 2 Control Circuit
    DTC P0353 Ignition Coil 3 Control Circuit
    DTC P0354 Ignition Coil 4 Control Circuit
    DTC P0355 Ignition Coil 5 Control Circuit
    DTC P0356 Ignition Coil 6 Control Circuit
    DTC P0357 Ignition Coil 7 Control Circuit
    DTC P0358 Ignition Coil 8 Control Circuit
    DTC P0359 Ignition Coil I Primary/Secondary Circuit Malfunction
    DTC P0360 Ignition Coil J Primary/Secondary Circuit Malfunction
    DTC P0361 Ignition Coil K Primary/Secondary Circuit Malfunction
    DTC P0362 Ignition Coil L Primary/Secondary Circuit Malfunction
    DTC P0370 Timing Reference High Resolution Signal A Malfunction
    DTC P0371 IC 24X Reference CKT Too Many Pulses
    DTC P0372 IC 24X Reference Circuit Missing Pulses
    DTC P0373 Timing Reference High Resolution Signal A Intermittent/Erratic Pulses
    DTC P0374 Timing Reference High Resolution Signal A No Pulses
    DTC P0375 Timing Reference High Resolution Signal B Malfunction
    DTC P0376 Timing Reference High Resolution Signal B Too Many Pulses
    DTC P0377 Timing Reference High Resolution Signal B Too Few Pulses
    DTC P0378 Timing Reference High Resolution Signal B Intermittent/Erratic Pulses
    DTC P0379 Timing Reference High Resolution Signal B No Pulses
    DTC P0380 Glow Plug/Heater Circuit "A" Malfunction
    DTC P0381 Glow Plug/Heater Indicator Circuit Malfunction
    DTC P0382 Exhaust Gas Recirculation Flow Malfunction
    DTC P0385 Crankshaft Position (CKP) Sensor B Circuit
    DTC P0386 Crankshaft Position (CKP) Sensor B Performance
    DTC P0387 Crankshaft Position Sensor B Circuit Low Input
    DTC P0388 Crankshaft Position Sensor B Circuit High Input
    DTC P0389 Crankshaft Position Sensor B Circuit Intermittent
    DTC P0400 Exhaust Gas Recirculation Flow Malfunction
    DTC P0401 Exhaust Gas Recirculation (EGR) Flow Insufficient
    DTC P0402 Exhaust Gas Recirculation Flow Excessive Detected
    DTC P0403 Exhaust Gas Recirculation (EGR) Solenoid Control Circuit
    DTC P0404 Exhaust Gas Recirculation (EGR) Open Position Performance
    DTC P0405 Exhaust Gas Recirculation (EGR) Position Sensor Circuit Low Voltage
    DTC P0406 Exhaust Gas Recirculation Sensor A Circuit High
    DTC P0407 Exhaust Gas Recirculation Sensor B Circuit Low
    DTC P0408 Exhaust Gas Recirculation Sensor B Circuit High
    DTC P0410 Secondary Air Injection (AIR) System
    DTC P0411 Secondary Air Injection (AIR) System
    DTC P0412 Secondary Air Injection (AIR) Solenoid Relay Control Circuit Bank 1
    DTC P0413 Secondary Air Injection System Switching Valve A Circuit Open
    DTC P0414 Secondary Air Injection System Switching Valve A Circuit Shorted
    DTC P0415 Secondary Air Injection System Switching Valve B Circuit Malfunction
    DTC P0416 Secondary Air Injection System Switching Valve B Circuit Open
    DTC P0417 Secondary Air Injection System Switching Valve B Circuit Shorted
    DTC P0418 Secondary Air Injection (AIR) Pump Relay Control Circuit Bank 1
    DTC P0419 Secondary Air Injection (AIR) Pump Relay Control Circuit Bank 2
    DTC P0420 Catalyst System Low Efficiency
    DTC P0421 Warm Up Catalyst Efficiency Below Threshold (Bank 1)
    DTC P0422 Catalyst System Low Efficiency Bank 1
    DTC P0423 Heated Catalyst Efficiency Below Threshold (Bank 1)
    DTC P0424 Heated Catalyst Temperature Below Threshold (Bank 1)
    DTC P0430 Catalyst System Low Efficiency Bank 2
    DTC P0431 Warm Up Catalyst Efficiency Below Threshold (Bank 2)
    DTC P0432 Catalyst System Low Efficiency Bank 2
    DTC P0433 Heated Catalyst Efficiency Below Threshold (Bank 2)
    DTC P0434 Heated Catalyst Temperature Below Threshold (Bank 2)
    DTC P0440 Evaporative

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  8. #8
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    1996 Z28

    Should've mentioned I know what the code means, I just don't know where to look to start diagnosing this

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  10. #10
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    1996 Z28

    Checked the connector on the intake manifold and it's good, the MSD opti doesn't have a connector at the distributor itself, its wired directly.

    Anything else I can check before I pull the distributor and send it in to MSD?

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