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3.5 Range Rover LPG Gas Conversion Problems

Please check here for late model (1996-9) Landrover and Discovery MFi V8 with blowback problems whilst running on gas.

For some years we have seen many airflow meters from LPG gas converted 3.5 models that have suffered physical damage due to induction side blowback. This forces the airflow meter flap backwards and results in distortion of the flap spindle. A possible cause is lean running when switching from LPG to petrol (or vice versa) with engine running. Later type hot wire airmass meters are also suffering blowback damage.

Blowback damage to airflow meters can be reduced or avoided by ensuring air intake hose retaining clamps are loose enough to separate by hand. When a blow back occurs, the hose should be loose enough to allow separation from the airflow meter and/or throttle body and release pressure thus acting as a pressure relief valve protecting the airflow meter. If the retaining clamps are too tight, there is no pressure release if blowback occurs. This results in destruction of airflow meter. LOOSEN THESE RETAINING CLAMPS NOW!!

Sometimes the simplest ideas are overlooked! Our usual disclaimer applies - If you don't immediately know what we're talking about - please be safe, print a copy and take vehicle to a specialist.

Millenium Auto Gas on (UK)01256 766945 (telefax) can supply gas/petrol changeover safety relays and blowback release valves for self fit (around UK30.00). If you use this firm please email and let me know how you get on with them. But beware - We now have several reports that the blowback protection valves have failed to protect airflow meters including later hotwire types - PLEASE ENSURE HOSE CLAMPS ARE LOOSE EVEN WITH VALVE FITTED.

Feedback, comments and useful facts to rod@carelect.demon.co.uk

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