Problem
A 1999 Toyota Prado VZJ95 (V6 petrol with APA tank and Airod converter LPG system) experiences hesitation and a potential backfire-like symptom through the airbox when accelerating quickly from a standstill on LPG. The idle is also noted to be high, likely due to a dirty IAC (Idle Air Control) valve. The issue is only present on LPG, not petrol.
Solution
The previous owner indicated that the issue is likely related to worn spark plugs and leads, which are known to cause backfiring or stalling under load in LPG systems. The LPG system was calibrated at 291,190km.
Key Specs
- Vehicle: 1999 Toyota Prado VZJ95 (V6 Petrol)
- LPG Tank: APA
- LPG Converter: Airod
- Spark Plugs: ACDelco Professional Platinum Spark Plugs (condition visually checked and deemed “fine” by the poster)
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