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Do FCs generally backfire?

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Old 10-17-03, 05:58 PM
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Do FCs generally backfire?

And Im not too sure if its backfire or just "hiccup"ing... My rotary mechanic tells me that its common in FCs (whether 88 specific or not I dont know)...

The only thing I can really throw in there is that the previous owner took out 1 of the 2 cats to keep the engine cooler so could it just be air collection and then "popping" out the exhaust?

Can I get rid of the "hiccups" somehow? How??
Old 10-17-03, 06:24 PM
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It is pretty common for fcs to backfire because they run rich. You can get an SAFC and dyno tune it to lean out the mixture and get more power and better gas mileage.
Old 10-17-03, 06:28 PM
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My mechanic just today otld me about an SAFC and that I should get it, but I dunno what a dino tune is...
Old 10-17-03, 06:53 PM
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umm a dyno is a performance test. gives a hella lot info about your car :-p
Old 10-17-03, 07:06 PM
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dyno test basically tells you how much power you are putting down at what rpm and it also tells you whats going on with your air/fuel ratio
Old 10-17-03, 07:17 PM
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Errr yah, dyno...

Should this be something I get right away or can I wait a bit on it? Theres still some cylinders and hoses I need to get so the SAFC was something I was gonna hit on in like 6 months...
Old 10-17-03, 07:25 PM
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You dont need an SAFC. It helps to make more power and take larger advantage of mods. What cylinders are you referring to?
Old 10-17-03, 07:35 PM
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Well its really the master cylinder because my brake fluid is leaking so I gots to get that fixed asap...
Old 10-17-03, 08:12 PM
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Re: Do FCs generally backfire?

Originally posted by EatRiceDontDriveIt
And Im not too sure if its backfire or just "hiccup"ing... My rotary mechanic tells me that its common in FCs (whether 88 specific or not I dont know)...

The only thing I can really throw in there is that the previous owner took out 1 of the 2 cats to keep the engine cooler so could it just be air collection and then "popping" out the exhaust?

Can I get rid of the "hiccups" somehow? How??
If it is a stock motor, fix or replace the ACV. it being bad (or removed) will cause backfiring.
Old 10-17-03, 09:17 PM
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my car has a gutted cat, and that thing backfires like crazy
Old 10-17-03, 09:52 PM
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why do you want to get rid of it? hehehe, i like how i get a little *POP* when i change gears... i like it even more when my cats are very hot, and not only do i get the pop, i get some flames out of my exhaust
Old 10-17-03, 11:25 PM
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If you have not removed any emissions components from the engine bay, it should not backfire ever. There is a valve in the air control valve which adds air to the air/fuel mixture during deceleration, specifically for preventing the backfires that happen because of unburnt fuel getting into the exhaust and igniting.
Old 10-18-03, 06:00 AM
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FC + Dyno

4th gear + 8k rpm = LOUD and 2-3 foot flame flame from both exhaust pipes at throttle lift off

Old 10-18-03, 06:56 AM
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sweet!! damn scott, i still need to get my car dyno'd!! the numbers aren't gonna be crazy, but i still wanna know, lol.
Old 10-18-03, 08:16 AM
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Ilove my car bacfiring, have you ever put it in nuetral, and revved it under a bridge to about 4. it sounds awesome because the backfire just keeeps echoing
Old 10-18-03, 11:27 PM
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mine only backfires when i switch gears at 7-8k rpm...i gutted my main cat
Old 10-18-03, 11:29 PM
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Originally posted by blue90rx7
mine only backfires when i switch gears at 7-8k rpm...i gutted my main cat
same here, mine doesn't backfire when i hold rpm's at 4k........
Old 10-19-03, 03:32 AM
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Originally posted by 88IntegraLS
If you have not removed any emissions components from the engine bay, it should not backfire ever. There is a valve in the air control valve which adds air to the air/fuel mixture during deceleration, specifically for preventing the backfires that happen because of unburnt fuel getting into the exhaust and igniting.
Ahhhh so if I remove my ACV I will shot mo bettah flames then.. even thou my cats are long gone.. I still have the airpump hooked up with the 6ports stuff.
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