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| falcon3518 |
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My car is has started to have a weird problem.
Every now and then it makes a huge bang noise(like a tyre exploding)under the bonnet then runs rough for about ten mins then its fine.' Any ideas anyone because i need help. thankyou |
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| Benny D |
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back fireing thru ther airbox. unsure wat cause is, maybe timing or similar.
ur right around the corner from me so ill keep an ear out. lol
_________________ BA XT V8. Ice Mint. 18" Speedys. XR6T LSD. Full Pacemaker twin 2 1/2inch Stainless Steel system. Custom CAI. Black XR interior with white trimming. Powerbond underdrive kit 25%. |
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| PoweredByCNG |
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Change plugs. Make sure you use Bosch double platinums and make sure they're gapped to 1.1mm or less and use dielectric grease generously in and around the rubber boots on each coil. Backfiring is almost always caused by a weak ignition system.
_________________ 2005 VZ Commodore SV6 with OMVL Dream XXI SVI LPG |
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| Nigel |
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Yep plugs. Almost every time.
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| falcon3518 |
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Thanks mate,but i always use ngk platinum tip plugs.They are about 25000 ks old but shouldnt
they be good for about 100 000 ks? Maybe my mechanis didnt gap them when he put them in 
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| tickford_6 |
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Posts: 6449 Joined: 11th Nov 2004 |
{USERNAME} wrote: Thanks mate,but i always use ngk platinum tip plugs.They are about 25000 ks old but shouldnt they be good for about 100 000 ks? Maybe my mechanis didnt gap them when he put them in You don't regap platinum or iridium plugs, you buy the plug with the right gap and install them untouched. |
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| PoweredByCNG |
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{USERNAME} wrote: Thanks mate,but i always use ngk platinum tip plugs.They are about 25000 ks old but shouldnt they be good for about 100 000 ks? Maybe my mechanis didnt gap them when he put them in For petrol-only engines, those plugs should last around 100,000km but for gas engines, expect the life to be shortened by 30%-50%. Gas is much harder on the ignition system. Electrode gap is very important, as is a seal free from spark leak between each coil and plug.
_________________ 2005 VZ Commodore SV6 with OMVL Dream XXI SVI LPG |
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| Nigel |
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Many LPG Fitters actually prefer not to use platinum/iridium plugs, and will switch back to normal plugs for LPG.
Nigel |
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| PoweredByCNG |
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Bosch double-platinums have been proven to work well on B-series gas engines. Just make sure that your coil boots have had plenty of grease applied to them to prevent spark leak and the plugs will last 80,000km.
_________________ 2005 VZ Commodore SV6 with OMVL Dream XXI SVI LPG |
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