Back-firing.....?
Back-firing.....?
Ok, so whilst revving the Engine in neutral up to 6000rpm then letting the accelerator go, it will make about 3-4 pops /noise out the exhaust. Is this from unburnt fuel getting into the Turbine ?
It has new NGK Leads and Plugs but running the old coil......could it be a sign the coil is getting old and tired ? or something else such as the 2 1/2 > 4" Cat > 2 1/2" exhaust system design ?
Cheers
It has new NGK Leads and Plugs but running the old coil......could it be a sign the coil is getting old and tired ? or something else such as the 2 1/2 > 4" Cat > 2 1/2" exhaust system design ?
Cheers
Computer games don't affect kids I mean if PacMan affected us as kids, we'd all be running around in darkened rooms, munching magic pills and listening to repetitive electronic music :D
- Starion VR4
- almost postwhore
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bang
mmm.. just have a look at yr exhaust manifold, me thinks U have a cracked 1 or a leak in the gasket area, they usually crack in the middle where the pipes joint in the centre, between #2-3 clyinder underneath. Another way is to place yr hand over the exhaust pipe to block all air escaping( have some1 else do it 4 U) it car stalls soon after all is well, if not U should be able 2 pim point where the leak is with the amount of air rushing out. :beer :beer
30PSI,2.4L! Wolf 3D Ver 4. VR4 Head.
- honest_jim
- Dorifto!
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Mine does the same thing since i got a 2 1/2 inch turbo back exhaust fitted the car seems happy enough though and is running better than ever so im not too fussed about it. My old nissan s-12 turbo did the same thing when i got a big exhaust on that too. Im pritty sure my staz doesent spit fire in anger its only when it revs down it just pop's abit, sounds good though.
Last edited by honest_jim on Fri Feb 24, 2006 5:17 pm, edited 1 time in total.
Starion 2000 EX.. bosch fuel pump, sard dumpvalve, knN drilled air box, Haltech F5 + 2 injectors, turbosmart FCD + Dual stage boost controller, tublar turbo header, turbo back 2.5" stainless exhaust 4.5" tip, Innovate MS wideband A/F meter.
Had the exhaust manifold crack welded up :beer
It does try to almost stall though after making the pop noises etc but composes itself and sets back to idling nicely. The only mods is the exhuast system, apart from that the Starion is stock as a rock.
It does try to almost stall though after making the pop noises etc but composes itself and sets back to idling nicely. The only mods is the exhuast system, apart from that the Starion is stock as a rock.
Computer games don't affect kids I mean if PacMan affected us as kids, we'd all be running around in darkened rooms, munching magic pills and listening to repetitive electronic music :D
Hmm, had the Injectors cleaned and flow tested and are perfect at the moment, so maybe AFM related or something along the fuel system such as the return line........
Computer games don't affect kids I mean if PacMan affected us as kids, we'd all be running around in darkened rooms, munching magic pills and listening to repetitive electronic music :D
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the popping/backfireing on throttle overun is caused by too much ignition advance under vacume, and possibly too lean a mixture under these conditions.
Maybe you have the vac hose from dizzy to TB on the wrong port.
It wont do it if its running rich, but an excessive lean mixture will exaserbate the problem.
Maybe you have the vac hose from dizzy to TB on the wrong port.
It wont do it if its running rich, but an excessive lean mixture will exaserbate the problem.
Re: Back-firing.....?
Reving to 6000rpm in neutral is the single worst thing you can do to an engine. There is no load on the piston this can cause major damage to the bearings especialy the little end. In racing terms it's known as "buzzing the engine" as it the same thing as missing a gear.toysrus wrote:Ok, so whilst revving the Engine in neutral up to 6000rpm then letting the accelerator go, it will make about 3-4 pops /noise out the exhaust. Is this from unburnt fuel getting into the Turbine ?
It has new NGK Leads and Plugs but running the old coil......could it be a sign the coil is getting old and tired ? or something else such as the 2 1/2 > 4" Cat > 2 1/2" exhaust system design ?
Cheers
Think about it, at 6000rpm your piston is going up and down 100 times per second!
DONT DO IT ANYMORE. BEARINGS ARE YOUR FRIENDS
Ash
Get Stroked! 2.3ltr EVO engine
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