Nissan Patrol 2008: Eco Shot causing knocking noise?
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Asked by Graham Morton
I had Eco Shot Gas put on my Patrol in 2008. Initially we had no trouble with it and all went well until 2010 when the gas stopped working. Eco Shot fixed it at no charge and we were told a bad lot of gas had caused the problem, although the problem was not explained to us. A little while later a knocking noise began when the motor was under power. No cause was found, but it was suspected that it was a valve noise or the bottom end, but we took it back as the installer had no means of tearing the engine down. We took the car to Nissan in December and asked them to check for the noise, but they said they couldn't hear anything wrong. The noise continued and was especially loud when first started up, however lessened on moving. It sounded like a loud tappet noise and was worse when towing. Recently, when we ran out of gas we noticed that the noise virtually disappeared. We had been told it wasn't anything to do with the gas, but now have doubts. How can we resolve the problem?
Answered by CarsGuide
18 Mar 2011First, establish clearly if the problem is associated with running on LPG. You say it went away when you ran on diesel, so run some LPG through it again and see if the noise returns. If it does head back to the LPG installer, or the Eco Shot people, and have them do a thorough check on the system. It could be that it's getting too much LPG. I am very wary of these systems, because they work by substituting LPG for diesel, and increase the power output of the engine. The idea is then that you lift off the throttle and use less fuel, so reducing your running costs, but many people don't and make use of the extra power instead. As a result some run into engine problems, as is possible with your Patrol.
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