Running Rough After Sitting - Stale Gasoline Replacement

Fuel Systembeginner✓ OP Confirmed

Problem

1987 Supra NA (7M-GE) was running rough after the car had been sitting for an extended period. The old gasoline had degraded to the point it produced an unusually foul smell in the garage.

Engine running roughExtremely foul-smelling old gasolineSlow/hard startingTakes approximately 60 seconds of warm-up before engine smooths out

Root Cause

Degraded/stale gasoline from the car sitting for an extended period. The fuel had gone bad enough to cause noticeably rough running and an abnormally strong odor.

Confidence

Low confidence — Original poster confirmed this resolved the issue

View Original Thread →Posted August 2024 on SupraForums.com