STIHL FS 91 R Trimmer DIES AT IDLE Error Fix: Engine Dies When Idling

The trimmer starts and runs at throttle but dies when you release the trigger.

Medium severity1 fix available

Quick Answer

Error DIES AT IDLE on the STIHL FS 91 R Trimmer means: Engine Dies When Idling. The top-ranked community fix is “Clean and adjust the carburetor” (medium difficulty, ~25 min, DIY cost: $0-10). 1 community-ranked fix available below.

Published February 2026 · 1 fix · string trimmer

Content is based on manufacturer service documentation, community repair experience, and OEM technical bulletins. Always verify with your owner's manual.Learn about our editorial standards.

When to Call a Professional

While many string trimmer repairs can be done safely at home, consider hiring a qualified technician if:

The repair involves electrical wiring, gas lines, or refrigerant
You've tried the top-ranked fix and the error persists
You smell gas, see sparking, or notice water leaking
The repair requires specialized tools you don't have
Your appliance is still under manufacturer warranty

Average professional repair cost for this issue: $50-100.

Other STIHL FS 91 R Trimmer Error Codes

E01

Engine Overheating

2 fixes

E02

Fuel Mixture Imbalance

2 fixes

E03

Ignition Coil Failure

Clutch Slippage

Throttle Trigger Malfunction

Air Filter Clogging

Spark Plug Fouling

Fuel Line Crack or Leak

2 fixes

People Also Ask About STIHL FS 91 R Trimmer Error DIES AT IDLE

What does error code DIES AT IDLE mean on a STIHL FS 91 R Trimmer?

Error code DIES AT IDLE on the STIHL FS 91 R Trimmer means: Engine Dies When Idling. The trimmer starts and runs at throttle but dies when you release the trigger.

How do I fix error code DIES AT IDLE on my STIHL FS 91 R Trimmer?

The most successful fix is "Clean and adjust the carburetor" (medium difficulty, ~25 minutes). Estimated DIY cost: $0-10. HomeMD has 1 community-ranked fix for this error.

Is error code DIES AT IDLE on a STIHL FS 91 R Trimmer serious?

This error is rated medium severity. It should be addressed soon, but your appliance may still function in a limited capacity.

Can I fix STIHL FS 91 R Trimmer error DIES AT IDLE myself?

Yes — the top-ranked community fix ("Clean and adjust the carburetor") is rated medium difficulty and takes about 25 minutes. Tools needed: Small flathead screwdriver.

How much does it cost to repair STIHL FS 91 R Trimmer error DIES AT IDLE?

DIY cost: $0-10. Professional repair typically costs $50-100. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the STIHL FS 91 R Trimmer have?

The STIHL FS 91 R Trimmer has 8 other known error codes, including: E01 (Engine Overheating), E02 (Fuel Mixture Imbalance), E03 (Ignition Coil Failure), E04 (Clutch Slippage), E05 (Throttle Trigger Malfunction), and 3 more.

What other error codes does the STIHL FS 91 R Trimmer have?

The STIHL FS 91 R Trimmer has 8 other known error codes:

E01 — Engine Overheating (2 fixes)
E02 — Fuel Mixture Imbalance (2 fixes)
E03 — Ignition Coil Failure (2 fixes)
E04 — Clutch Slippage (2 fixes)
E05 — Throttle Trigger Malfunction (2 fixes)
E06 — Air Filter Clogging (2 fixes)
E07 — Spark Plug Fouling (2 fixes)
E08 — Fuel Line Crack or Leak (2 fixes)

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