| NISSAN PATROL TI 2004:
RE: BACKFIRE
|
| 14 MAR 2009 |
GAS |
*ADVICE* |
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| THE SINGLE MOST COMMON CAUSE OF BACKFIRING IN AN ENGINE RUNNING ON GAS IS THE PLUG GAPS |
"The single most common cause of backfiring in an engine running on gas is the plug gaps. Gas has a higher resistance than petrol and therefore the plugs need to be set 15 to 20 % closer than the factory setting for petrol. This will also make startup much easier than your probably experiencing now.
The other thing that hinders gas engines is if the air intake is picking up its air from under the bonnet, and especially behind the radiator as this air is already super heated (90-110C) and is much thinner and causing the engine to run rich on a standard gas (carb) system. The computer managed systems will compensate for this to a point, but the super heated air will still render the gas unstable causing a multitude of nasty side effects like detonation, overheating, melted pistons and extra damage to the valve seats.
The best thing is to pick up ambient air from outside the engine bay say through a snorkel, grille intake or any type of fresh air kit, as even on the hottest day travelling in the outback the air temperature will not be over 50C.
I had the experience with an old truck fitted with a 4.1L Ford engine that I used in the central and northwest of NSW in all sorts of weather conditions which continuously ran hot and played up until I learned the secret about the ambient air. I merely fitted an extension to an enclosed air filter to pick up air in front of the radiator and it ran a constant 72 degrees C (cool thermostat) from that day on and no more backfiring or pinging.
I hope this is a big help to everyone out there with any sort of vehicle running on gas.
P.S. the muck that builds up in the intake (around the throttle body and butterfly plate) is compressor oil used in the propane to give it its smell and lubricate the pumps so that you can fill up quickly at the bowser. It doesn’t vapourise completely and builds up over a long period of time. Just wash it out with carby clean or some other solvent from time to time."
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POSTED
BY: WILLIAM CORDELL
- CASTLEREAGH - NSW - AUS 14 MAR 2009
PROVIDE
FEEDBACK
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========== ORIGINAL POSTING ==========
"NISSAN PATROL TI 2004: BACKFIRE - I have a Ti Patrol 2004 model which I bought brand new. I knew that will be expensive to run on petrol so I decided to convert it to gas. Because my car was under warranty my gas unit had to be installed through a gas conversion company referred by Nissan. For the first 20000km I had no problems, since then the car hasn't stop backfiring. I am fed up with going to the mechanics all the time. They fix it for 2000-3000km and the same thing happens again.
Has anyone got a similar problem? Or am I the only unlucky one? Gerry"
POSTED BY: GERRY RASSIAS - MELBOURNE, VIC - AUS 31 MAY 2007
========== REPLY ==========
Your backfiring is due to a fault in the ignition system. Fit NGK or DENSO plugs ONLY for LPG and either EAGLE LPG spiral core leads OR check coil packs if your vehicle has them instead of HT Leads. Also, make sure there are NO induction leaks as you may have had some damage due to backfiring. Good luck and let us know how you go.
Cheers; David.
POSTED BY: DAVID - MOUNT BARKER, SA - AUS 31 MAY 2007 |
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