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Speedway 1985-1992 GM TBI Engine EFI Wiring Harness
Speedway 1985-1992 GM TBI Engine EFI Wiring Harness

Speedway 1985-1992 GM TBI Engine EFI Wiring Harness

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Speedway 1985-1992 GM TBI Engine EFI Wiring Harness
Speedway 1985-1992 GM TBI Engine EFI Wiring Harness
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We estimate this item will ship on or before February 1st.
Part # 91008592
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  • Get FREE shipping when your order includes this item and exceeds $99! Ground shipping only in the contiguous US.


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Take the fear out of electronic fuel injection! These engine wiring harnesses are designed to make your engine transplant effortless. Each new harness contains in-depth application-specific instruction sheets, clearly marked factory GM connectors, labeled GXL jacketed wire, GM color coding, and pre-fitted corrugated slit loom for an extra value and professional look. All un-needed emissions wiring is eliminated to make the install as simple and reliable as possible.

  • Made from premium grade GXL jacketed automotive wire
  • Most wiring is larger gauge than stock application for durability
  • No splices to reduce points of failure
  • All primary grounding is done at the head or block and grounding points are isolated from each other to reduce electrical interference and minimize ground looping
  • Harness wiring matches GM wiring configuration and jacket colors follow GM color coding for easy identification
  • All electrical connectors are made by Delphi or Packard and are direct fit for GM cars and trucks
  • Can be installed to run engine in 20 minutes, but figure 4-6 hours for a professional installation
  • OBD1 diagnostic port for connection to scanners and tuning tools
  • Made in the USA.

Installation Instructions (PDF)


  1. Has connections for 700R4 transmission.
  2. Common aftermarket fuel pump and fan relays are included. Fan relay has a load rating of 30 amps so it can handle most fans, however if the fan requres more current to operate then the relay can be replaced with a 40 amp relay from any auto parts retailer.
  3. These harnesses feature all of the connection points necessary to run the engine and transmission if applicable. The emission equipment has been eliminated and only the needed connections to run the engine and transmission are incorporated.
  4. 1985-1992 Throttle Body Injection (TBI)
  5. Standard length harnesses are 54" from the back of the engine to the PCM connectors.


This harness is covered under warranty for the lifetime of the original owner against defects in workmanship within the wiring harness only, not time, or any damage in result of defective workmanship of the wiring.
Some parts are not legal for use in California or other states with similar laws/regulations

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