$projecthp
  • hard starting and shutter Please Help!!
  • hard starting and shutter Please Help!!
  • hard starting and shutter Please Help!!
  • hard starting and shutter Please Help!!

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  1. #1
    New Member
    Join Date
    Apr 2020
    Location
    NC
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    1
    Corvette(s)
    1989 C4 Automatic
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    Default hard starting and shutter Please Help!!

    So my wife and I inherited a 89 c4 automatic with 17,300 miles. its been in storage forever and driven once or twice a year. I picked up the car with my trailer from Ohio, brought it home to my shop and immediately evacuated and filled all fluids and changed all filters throughout car. following that i changed plugs, wires, fuel pump, cluster panel to repair a parasitic draw, ecm as the car was shutting off while driving intermittently due to a short inside ecm. took car out for 3 gas tanks of free ethanol to see what new problems were up. since i have had the car it has a hard time starting as if low fuel pressure but i checked that with KOEO and KOER both were good. car also has a shutter in 3rd gear after torque converter lock up between 1300-2000 rpm. idle has a slight stumble but not a heavy miss

    I have checked
    -fuel pressure
    -firing order
    -spark at plugs
    -rechecked plugs after driving and look perfect
    -checked fuel pressure regulator with vacuum tester
    -checked for vacuum leaks
    -plugged my scan tool in and checked live data all looked good
    -did a throttle sweep and seen no dead spots
    -cleaned and checked maf
    -preformed a stethoscope hear test on injectors and all were good
    -removed all injectors and bench cleaned both ways
    -vacuum tested egr valve as i had it removed
    -ohm tested coil and all injectors
    -checked cap and rotor
    -did a dark test for spark arching

    i cannot figure this one out. I have spent hours and hours on this car and not getting anywhere. anybody have any ideas?

  2. #2
    Member
    Join Date
    Aug 2006
    Location
    S-NJ
    Posts
    443
    Corvette(s)
    93 Ruby Aniv roadster/6spd
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    Default

    This may help.
    I got Permanently banned from that forum.
    hard start...long crank SOLVED - CorvetteForum - Chevrolet Corvette Forum Discussion
    Currently 93 Ruby 40th Anniversary Roadster/6 SPD

    Previous 58,68,70,76,78,85,90

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