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MK3 / A70 markets
Manuals, parts, data

Troubleshooting assistant

Pick a problem area, choose the symptom, then follow the remedy links or step-by-step TSRM procedure.

Diagnostic codes
Searching in 1990 USDM TSRM.
Areas /Engine will not start / hard to start — cranks OK
Engine Mechanical

Engine will not start / hard to start — cranks OK

Starter cranks but engine is difficult to start or does not start.

Step-by-step guide available. Use this when the remedy table sends you to a troubleshooting procedure.
Start guide
Possible causes and remedies
Possible cause
Vacuum leaks
• PCV hoses
• EGR valve
• Intake manifold
• Air intake chamber
• Throttle body
• ISC valve
Remedy
Repair as necessary
Possible cause
Pulling in air between air flow meter and throttle body
Remedy
Repair as necessary
Possible cause
Ignition problems
• Ignition coil
• Igniter
• 7M-GE distributor
• 7M-GTE cam position sensor
Remedy
Perform spark test
Possible cause
High-tension cord disconnected or broken
Remedy
Inspect cord
Possible cause
No fuel supply to injector
• No fuel in tank
• Fuel pump not working
• Fuel filter clogged
• Fuel line clogged or leaking
Remedy
Troubleshoot EFI system
Possible cause
EFI system problems
Remedy
Repair as necessary
Possible cause
ISC system problem
Remedy
Check ISC system
Possible cause
Spark plugs faulty
Remedy
Inspect plugs
Possible cause
Low compression
Remedy
Check compression