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#1
06-28-2006, 02:05 PM
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Backfire
Hey all;
Ever since I installed my ported TB the car has been back firing... The main time it does it is when I downshift. I rev match and punch it into gear and it'll back fire every now and then. It also did it earlier today when I pulled out of a gas station really quick bc of traffic. As I was about to shift to 2nd, it back fired. Plugs, wires, and coil pack are good. I've checked. It's been doing it since I put the TB on for sure. It was fine before that. Only happened maybe once a month or so. Any ideas here?
__________________
2013 Chevy Sonic 1LZ Daily Driver, 1.4L Turbo, 6spd 75 Monte Carlo SBC 400 6.6L, Aluminum heads, Hurricane Intake... 12 Chevy Sonic 1LZ 1.8L - Traded 01 Pontiac Grand Am SE - RIP 95 Eagle Talon ESi-T 5spd - RIP 88 Oldsmobile Cutlass Ciera- RIP 
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#2
06-28-2006, 02:12 PM
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Re: Backfire
well you have to be running pretty damn rich to backfire. You probably have a vac leak somewhere on your throttle body. Air is getting out. Have you checked all the vacuum connections?
__________________
now - 2000 civic soon - 2002 is300 
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#3
06-28-2006, 02:19 PM
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Re: Backfire
I've checked but I can't find any leaks. When I'm driving I hear a hiss, sounds like a turbo, and I can hear it get higher as the rpms rise and IM pressure goes up.
__________________
2013 Chevy Sonic 1LZ Daily Driver, 1.4L Turbo, 6spd 75 Monte Carlo SBC 400 6.6L, Aluminum heads, Hurricane Intake... 12 Chevy Sonic 1LZ 1.8L - Traded 01 Pontiac Grand Am SE - RIP 95 Eagle Talon ESi-T 5spd - RIP 88 Oldsmobile Cutlass Ciera- RIP
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#4
06-28-2006, 03:23 PM
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Re: Backfire
yep you have a leak somewhere. Try putting some soapy water in a spray bottle and spray it all over your throttle body. It will bubble if there is a leak. Do this while the car is running. If you still can't find it, built a boost leak tester, heh.
__________________
now - 2000 civic soon - 2002 is300
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#5
06-28-2006, 03:29 PM
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Re: Backfire
Ha ha, boost leak tester on a NT car...
Maybe a shitty gasket? Did you put in a new one with the new TB? Did you torque er down good?
__________________
 Build on hold until I get a good paying job, either in school or once I get out. At that time a full tear down and complete rebuild should be in order. The Purple People Eater will ride again... January 2011 can't come soon enough.
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#6
06-28-2006, 10:11 PM
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Re: Backfire
I got a new gasket when I did the TB. I didn't torque to specs, but that SOB is on there good. I'll try the soapy water thing when I get a chance.
So, what is the science of this? Why would a leak at the TB cause it to backfire?
__________________
2013 Chevy Sonic 1LZ Daily Driver, 1.4L Turbo, 6spd 75 Monte Carlo SBC 400 6.6L, Aluminum heads, Hurricane Intake... 12 Chevy Sonic 1LZ 1.8L - Traded 01 Pontiac Grand Am SE - RIP 95 Eagle Talon ESi-T 5spd - RIP 88 Oldsmobile Cutlass Ciera- RIP
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#7
06-28-2006, 10:19 PM
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Re: Backfire
If you crank it down instead of torquing it to the spec then you'll ruin the gasket and get a nasty leak...
__________________
-Brian
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#8
06-28-2006, 10:35 PM
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Re: Backfire
you could have put hte gasket in backwards...mechanic that did my TB and diagnosed my bad idle was cause i installed the tb gasket backwards.. all in all a new TB fixed it lol
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#9
06-28-2006, 10:43 PM
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Re: Backfire
Quote:
__________________
2013 Chevy Sonic 1LZ Daily Driver, 1.4L Turbo, 6spd 75 Monte Carlo SBC 400 6.6L, Aluminum heads, Hurricane Intake... 12 Chevy Sonic 1LZ 1.8L - Traded 01 Pontiac Grand Am SE - RIP 95 Eagle Talon ESi-T 5spd - RIP 88 Oldsmobile Cutlass Ciera- RIP
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#10
06-28-2006, 11:29 PM
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Re: Backfire
I dont exactly know what I am talking about but its the only thing that makes sense to me. Back firing happens when there is a lot of extra fuel and not all of it burns and gets into the exhaust manifold where it then combusts. Well, the only way you would be getting a lot of extra fuel is by some of your air leaking off, hence the "nonturbo boost leak". I dont know if I am right, but like I said thats what makes sense to me.
__________________
Build on hold until I get a good paying job, either in school or once I get out. At that time a full tear down and complete rebuild should be in order. The Purple People Eater will ride again... January 2011 can't come soon enough.
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