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1998 WRX Unusual fuel consumption


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Hi there everyone, I have a 1998 WRX GF8 and was wondering if anyone could advise me as to why my car is randomly using a lot more fuel. Just started happening and causes backfiring to occur, the only mods I have done are 3" Siamese downpipe and that's all

 

Any help will be greatly appreciated

 

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Did you just change the exhaust when this started happening?
 
When does the backfiring occur exactly?
 
Any other problems with how it runs?
 
So i was just running blast pipes but it did it before I installed those

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On 18/08/2018 at 6:25 AM, tobrien109 said:

So i was just running blast pipes but it did it before I installed those

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Unfortunately I'm not cool enough to know what those are.

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  • 2 weeks later...
  • 2 weeks later...

What's the smoke like out the back of your car? Get a mate to rev it while in your driveway and watch. If black its a sign you're running too rich. I'd suggest changing fuel filter spark plugs and running some strong injector cleaner in your fuel tank. 

 

If that doesn't fix it time to test your afm with a multimeter and possibly clean. 

 

Let us know how it goes. 

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  • 4 weeks later...
What's the smoke like out the back of your car? Get a mate to rev it while in your driveway and watch. If black its a sign you're running too rich. I'd suggest changing fuel filter spark plugs and running some strong injector cleaner in your fuel tank. 
 
If that doesn't fix it time to test your afm with a multimeter and possibly clean. 
 
Let us know how it goes. 
No smoke whatsoever, just the occasional flame rev-matching on decel

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