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Fuel pressure regulator stuffed, broken. When petrol is found in the vacuum hose (a slightly smaller hose)- that's the one going into the inlet manifold Don't become mixed up with the return hose to the petrol tank (a slightly larger one) That's the one going into the firewall back to the...

UP DATE UP DATE UP DATE UP DATE 16/01/17 NOT BACK FIRING AT ALL USES VERY LITTLE GAS, POWER LIKE A NEW ENGINE. Have not replaced the spark plugs or treated the fuel or anything but changed oil and filters, water etc. Having the Crankshaft Position Sensor replaced did it for my engine. Good luck.

Hello Brain Snap I went through a lot of FIXES to stop my VR Commodore to back firing. NO luck. One day the car stop running all together The mechanic replaced the CRANKSHAFT POSITION SENSOR and the back firing stopped. It's been over a year now!! Have a look in the manual. The sensor...

please refer to update above BACK FIRE ON GAS I found why my Commodore kept backfiring at random. vince89

go to this site What is a fuel injector? How do you clean fuel injectors?

Back fire with gas My VR would back fire at random times and only stop after running on petrol for a couple days then back fire again. first I adjusted the gas- maybe too lean - no not that changed spark plugs and leads - after 3 months back fired again etc - changed spark plugs again -...