Banks backfiring

juanito817 · 02-20-2005, 04:57 PM

I've had my Banks on my Titan for 2 weeks now and just recently it started backfiring. When I get to any speed past 20 mph and let off the throttle it backfires. I just want to know what might be causing that and if any solutions please let me know. I just hope that it isn't something really bad.

Hatchman · 02-20-2005, 05:00 PM

You may have leaks. Get under the truck and check for loose bolts.

Bill_n · 02-20-2005, 06:10 PM

Hmmmm .....

Seems like it would have to be more than just exhaust leaks ....

Something has got to be causing a buildup of raw fuel in the exhaust sytem ... right ?

Sounds like a sensor has gone haywire or something ....

juanito817 · 02-20-2005, 06:40 PM

Well since its dark already here in Texas I did get under and I hear this noise like a diesel ticking sound. How do I check for leaking air since the bolts seem fine, none are loose. Where are the sensors?

37L1 · 02-20-2005, 07:09 PM

Quote:

Originally Posted by juanito817

Well since its dark already here in Texas I did get under and I hear this noise like a diesel ticking sound. How do I check for leaking air since the bolts seem fine, none are loose. Where are the sensors?

Get a spray applicator with soapy water, if you have a leak it will bubble at the point. Check all pipe fittings from the start of the "y" to the tail pipe.

Make sure your ground strap near the resonator (2 wheel drive) is secure.

Good luck.

GETSOMZ28 · 02-20-2005, 07:15 PM

Quote:

Originally Posted by 37L1

Get a spray applicator with soapy water, if you have a leak it will bubble at the point. Check all pipe fittings from the start of the "y" to the tail pipe.

Make sure your ground strap near the resonator (2 wheel drive) is secure.

Good luck.

FYI, 4x4's have the same grounding strap.

juanito817 · 02-20-2005, 07:58 PM

well there is something wrong I think because the exhaust sound is not as loud as when I had it the first week. It sounds more timid and I don't know if that is normal or not. Well I guess I'll check on the leaks again when I get out of work tomorrow.

37L1 · 02-20-2005, 08:06 PM

Check everything, including the gaskets at the resonators to the Banks pipes as well as make sure you have the muffler on correctly with the inlet towards the engine. That's about all I can think of, anyone else?

Sully · 02-20-2005, 11:06 PM

Are you sure it is a backfire? There is no way uncombusted fuel is making it past your catalitic converters they are way to hot. Did you remove the CATS?

falchulk · 02-21-2005, 09:28 AM

Quote:

Originally Posted by Sully

Are you sure it is a backfire? There is no way uncombusted fuel is making it past your catalitic converters they are way to hot. Did you remove the CATS?

Wrong. Everytime you let off the gas uncombusted fuel makes its way through. Ever see those guys that rev the engine and hit the spark igniter switch to produce the flamethrower effect from the tailpipe? Thats unburnt fuel being ignited. On a stock system the muffler keeps you from hearing this. On my Camaro I have straight pipes after the cats and get pops on deceleration as well. In this case he has a muffler that should stop him from hearing this. The only cause of it would be a leak letting oxygen combine with the unburnt fuel in the hot exhaust pipe.

juanito817 · 02-21-2005, 02:24 PM

I really don't mind it making the poping noise as long as there is nothing wrong with the truck. I don't know if this is normal on an after market exhaust. This is my first ever exhaust mod on a truck that I've made and so I don't know much about these kind of things. I took it to the dealer for oil change and he didn't say nothing was wrong with the truck, but then again I didn't tell him it was making that noise. I checked a little bit closer and noticed that it made the poping noise when it downshifts. It was just that someone told me that he thinks that this noise is backfire because I asked him.

sapper1971 · 02-21-2005, 08:27 PM

A true back fire is a loud A$$ED gun shot type of BANG! If you hear it, you will know it, because you'll most likely duck for cover. LOL! Are you talking about a sort of constant crackling when you let off the gas OR when coasting down hills OR after a down-shift? Not a REAL loud crackling, either. I think thats pretty normal for an aftermarket exhuast. Each exhaust type is different so its hard to say. But the more "open" or less restricted mufflers will crackle like that under certain situations. I think it sounds cool, myself. But your exhaust may have needed time to "break-in" and thats why you did not hear the crackle at first. Also, your exhaust note will often change a bit too, after break-in. Most of the time, it seems louder. But I guess thats not always the case. Like I said, each exhaust type is dfferent.

juanito817 · 02-22-2005, 02:17 PM

A guy at work said I might be running lean. He thinks that why it makes the noises. Alright guys thanks for the inputs. It's just a constant crackling after the trans downshifts after I let up on the gas. Whew!!! I thought it was something bad and I guess its normal. I'm not really versed in the art of modifing trucks, so I just didn't know what to expect after putting the exhaust on. I just wanted to make the exhaust note a little louder and damn am I happy with the Banks. I guess I'll see you guys around.

Timba24 · 02-22-2005, 02:24 PM

if all you did was change the exhaust then the guy at work would be dead wrong unless your truck was running lean from the factory. It doesnt sound like you have anything to worry about.

Sully · 02-24-2005, 03:10 AM

Hey falchuck, I took this straight from the Energy Citations Database a government site. It states exactly what I thought. Very little unburned fuel should reach your Catalytic Converter, if it does the Catalyst is so hot it will immediately vaporize any fuel. To much of this and the Catalytic Converter will fail over time. Most fuels boil at about 1/4 the temperature of your catalytic converter.

Excess Fuel Entering Exhaust
The fuel that powers a vehicle is meant to burn in the combustion chamber only. Any fuel that leaves the
combustion chamber unburned will enter the exhaust system and light-off when it reaches the catalytic converter.
This can super-heat the converter far above operating conditions and cause a converter meltdown.
Possible causes include:
• Incorrect fuel mixture
• Incorrect timing
• Corroded spark plugs
• A faulty oxygen sensor
• Sticking float
• Faulty fuel injector or a malfunctioning check value