82 half the time starts and dies

monsolo2

Member
Guys, I'm helping a friend of mine fix a problem with his 82 L83 crossfire system. Half the time she fires up and runs perfectly... half the time she fires up and then dies and won't start for a little while. Finally, she'll start very roughly and then run fine. I know those had a rudimentary ECM... does anyone know what the starting sequence is or maybe what sensors and solenoids are used? Has anyone else had this problem?
 
http://garage.grumpysperformance.co...sfire-vette-won-t-run-right.10096/#post-39656

http://garage.grumpysperformance.com/index.php?threads/got-a-cross-fire-corvette.640/#post-25768

http://garage.grumpysperformance.co...ng-tpi-crossfire-or-lt1-vette.1401/#post-9259

http://garage.grumpysperformance.com/index.php?threads/c4-c5-corvette-trouble-codes.2697/#post-7017

https://www.physicsforums.com/threads/current-draw-of-a-motor-under-different-situations.585336/

ctrical.com/electricaltech/howitworks.shtml


the symptoms sound like a defective sensor or fuel pump or fuel pump relay, but read through the links it will prove useful.
as is true with many questions here theres a few related threads that may hold the answer your looking for in the links and sub links

I bought a relay, but I don't know how to hook it up. all I see are a few weird numbers and strange symbols, what do they mean?
-a standard bosch-style relay will have 4 or 5 numbered leads (30, 85, 86, 87, and sometimes 87a). why they picked those numbers, I have no clue; but I can tell what they hook up to.

1982fp2 (1b)

hookup.jpg

1983rlk.jpg


21PSbKBBbbL._SL500_AA300_.jpg

  • Lead color code
  • Black: Coil supply
  • White: Coil supply
  • Red: SPDT normally open
  • Blue: SPDT common
  • Yellow: SPDT normally closed
-30 = constant [positive (+)] power (usually wired directly to car battery)
-85 = coil ground (wired to the negative (-) battery terminal or any grounded metal panel in the car)
-86 = coil power (wired to the control source. could be a switch, or it could be the car's IGN or ACC circuit.)
-87 = switched [positive (+)] power output. (when the relay coil is powered, lead/pin 87 is connected to lead/pin 30)
-87a = [on 5 lead/pin relays only] this lead/pin is connected to lead/pin 30 when the coil is NOT powered.

relaywire.jpg


1982fp1.png



1982fp2.JPG




 
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