[Gmecm] 93 CHEVY g20 VAN

[Programmer]

Common faults.

CTS (coolant temp sensor--at manifold, not head). Scan will verify this one quick.
Leaking exhaust manifolds...system will command rich.
Leaking EGR valve...runs richer at lower speeds and idle, due to lower MAP vacuum signal.
Worn distributor bushings...cracked magnet--can double trigger the RPM signal to the ECM.
Bad MAP sensor or vacuum leak to sensor--various TSB's on this failure.
Incorrect spark plug reach (least likely).

Lyndon.



  ----- Original Message ----- 
  From: michael b 
  To: gmecm at diy-efi.org 
  Sent: Friday, December 30, 2005 11:22 AM
  Subject: [Gmecm] 93 CHEVY g20 VAN


  93 CHEVY G20 VAN 5.0L  RUNS TOO RICH, I REPLACED PLUGS, CAP,ROTOR,WIRES, O2 SENSOR,THROTLE BODY GASCKET,MAP SENSOR, I EVEN CUT THE CAT OUT TO SEE IF WAS CLOGGED ALOT OF PARTS AND HAD THE CODES CHECKED ( NO FAULT CODES FOUND) BLACK SMOKE , RUNS ROUGH, STALLS. ANY HINTS?


------------------------------------------------------------------------------


  _______________________________________________
  Gmecm mailing list
  Gmecm at diy-efi.org
  http://lists.diy-efi.org/mailman/listinfo/gmecm
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.diy-efi.org/pipermail/gmecm/attachments/20060102/fbc97987/attachment.html