LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Audi >> 1983 >> 5000 Base >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - Diesel >> Testing >> Glow Plugs >> 4000
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Glow Plugs: 4000

  1. Ensure battery is fully charged. Connect test light between No. 4 cylinder glow plug and ground. Turn ignition to heating position. Test light should glow. If not, check glow plug relay, ignition switch, or fuse box relay plate.
  2. If test light glows, turn ignition off. Connect ammeter between No. 4 cylinder glow plug and battery positive lead. Turn ignition switch on for several seconds. Initial current draw will be as high as 140 amps but will stabilize to 36 amps in a few seconds.
  3. To determine inoperative glow plug, remove wire and bus bar for plugs. Connect test light to battery positive terminal. Touch test light probe to each glow plug in turn.
  4. If light glows, glow plug is good. If light does not glow, glow plug is defective and should be replaced.
  5. If total current draw exceeded 36 amps in step 2), check current to each individual glow plug. Replace any glow plug drawing more than 9 amps.
  6. A total current draw of less than 36 amps indicates one or more defective glow plugs. A current of 27 amps is 1 bad glow plug, 18 amps is 2 bad glow plugs, and 9 amps is 3 bad glow plugs.
scientia non olet · About LEMON Manuals