1991 Subaru Legacy LSi, AWDFACTORY OEM SERVICE PROCEDURE

Ignition Checks: Spark

WARNING: This page is about a different car, the 1990 Subaru XT6, 1990 Subaru XT, 1990 Subaru Loyale, and 1990 Subaru Legacy. However, it is still accessible from the selected car via links, so may be relevant.

Check for spark at spark plug wires using a spark tester. Check resistance of each spark plug wire. Replace wire if resistance is not within specification. See appropriate HIGH TENSION WIRE RESISTANCE table below.

LEGACY HIGH TENSION WIRE RESISTANCE

Application Resistance: Ohms Wire Length: In. (mm)
No. 1 495-11,560 21.25 (540)
No. 2 486-11,330 21.65 (550)
No. 3 495-11,560 21.25 (540)
No. 4 524-12,230 23.62 (600)
LOYALE HIGH TENSION WIRE RESISTANCE

Application Ohms (PFI) Ohms (TBI)
No. 1 243-567 243-567
No. 2 948-22,130 838-19,560
No. 3 958-22,360 790-18,440
No. 4 241-562 241-562
XT & XT6 HIGH TENSION WIRE RESISTANCE

Application Ohms (1.8L) Ohms (2.7L)
No. 1 243-567 243-567
No. 2 947-23,030 10,860-25,330
No. 3 958-22,360 11,240-26,230
No. 4 241-562 452-10,550
No. 5 N/A 11,430-26,680
No. 6 N/A 260-607
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.