Popping noise from pass. side engine

Ninja_Lawn_Guy · 08-21-2008, 07:43 AM

I have a new popping noise as if I have no exhaust on the passenger side of my '03 Sierra 1500. A gm tech guy said it was a bad cat, but it sounds like it is the engine under the air intake tube, near the plugs.

Any ideas?

I wanted to cut the cats off and straight pipe them, but he said without o2 sensor trick plugs I would have a check engine light on because the rear 2 sensors would say I'm polluting. The magnaflow replacement y-pipe with 2 new cats is like $389. The pipe cutting and replacement is like $45

stumpuller454 · 08-21-2008, 12:29 PM

compression test to verify there isn`t a bad vavle... also vacuum leaks are common in the intake, use water n soap on intake when running to verify...exhaust sounds like a great idea!

leolkfrm · 08-21-2008, 01:52 PM

Warped exhaust manifold?

Ninja_Lawn_Guy · 08-21-2008, 04:28 PM

It was BOTH of my cats...the insides are loose and blocking the paths...causing backpressure and sluggish driving. Having the straight pipes put on in the morning...thanx guys ..

Any ideas on those trick o2 sensors?...I need 2 rears so I don't drive myself nuts with the check engine light always on.

stumpuller454 · 08-21-2008, 08:30 PM

get a CUSTOM ECM tune... they can program them out, plus you get better mileage power and transmission respose, i recommend WESTERS, checkem out online...Kicks the **** outta my old superchips hand held!

Ninja_Lawn_Guy · 08-22-2008, 06:15 PM

The light never came on, but might ....I will look into it...I have a friend who might be able to hook me up. Here's a link to a quick couple clips of the new sound. Pretty throaty for a 4.3L V6

MySpaceTV Videos: New Pipes by Rick

MySpaceTV Videos: New Rumble 40 Series Flowmaster -NO CATS- 4.3L VORTEC V6 by Rick

08-21-2008, 07:43 AM	#1
Ninja_Lawn_Guy Full Member Join Date: May 2008 Posts: 28	Popping noise from pass. side engine I have a new popping noise as if I have no exhaust on the passenger side of my '03 Sierra 1500. A gm tech guy said it was a bad cat, but it sounds like it is the engine under the air intake tube, near the plugs. Any ideas? I wanted to cut the cats off and straight pipe them, but he said without o2 sensor trick plugs I would have a check engine light on because the rear 2 sensors would say I'm polluting. The magnaflow replacement y-pipe with 2 new cats is like $389. The pipe cutting and replacement is like $45

08-21-2008, 12:29 PM	#2
stumpuller454 Senior Member Join Date: Dec 2007 Location: Alberta Posts: 785	compression test to verify there isn`t a bad vavle... also vacuum leaks are common in the intake, use water n soap on intake when running to verify...exhaust sounds like a great idea! __________________ 1998 GMC K2500 Ext.cab short box 454ci *1951 Chevrolet 1420 pickup like new!* Red seal certified Journeyman Automotive Mechanic

08-21-2008, 01:52 PM	#3
leolkfrm Senior Member Join Date: Mar 2008 Location: N.Y. Posts: 951	Warped exhaust manifold? __________________ 4 wheels move the body 2 wheels move the soul

08-21-2008, 08:30 PM	#5
stumpuller454 Senior Member Join Date: Dec 2007 Location: Alberta Posts: 785	get a CUSTOM ECM tune... they can program them out, plus you get better mileage power and transmission respose, i recommend WESTERS, checkem out online...Kicks the ** outta my old superchips hand held! __________________ 1998 GMC K2500 Ext.cab short box 454ci 1951 Chevrolet 1420 pickup like new!** Red seal certified Journeyman Automotive Mechanic

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08-21-2008, 04:28 PM	#4
Ninja_Lawn_Guy Full Member Join Date: May 2008 Posts: 28	It was BOTH of my cats...the insides are loose and blocking the paths...causing backpressure and sluggish driving. Having the straight pipes put on in the morning...thanx guys .. Any ideas on those trick o2 sensors?...I need 2 rears so I don't drive myself nuts with the check engine light always on.

08-22-2008, 06:15 PM	#6
Ninja_Lawn_Guy Full Member Join Date: May 2008 Posts: 28	The light never came on, but might ....I will look into it...I have a friend who might be able to hook me up. Here's a link to a quick couple clips of the new sound. Pretty throaty for a 4.3L V6 MySpaceTV Videos: New Pipes by Rick MySpaceTV Videos: New Rumble 40 Series Flowmaster -NO CATS- 4.3L VORTEC V6 by Rick

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