Smoking exhaust - 2003-04 Mach 1 Registry Owners Club

twystyd · 07-14-2012, 03:26 PM

I blew the inside of my drivers side cat out and it was rattling around so I cut the cat off and spliced in a new piece of pipe. Then the car started to smoke so I removed the passenger side and spliced in another piece of pipe. While under the car I found the passenger side O2 sensor wire was broken so I just removed it. Still smoking. The smoke is white, and gets more dense when I start back going again, then seems to taper off until I slow up. Any thoughts on what is causing this? I haven't had it tuned so Im leaning toward that being the culprit since I have completely changed the exhaust from stock.

2003 Mach 1 SLP LM1 with BBK high flow mid pipe, now without cats. Stock manifolds.

Mach828 · 07-14-2012, 05:12 PM

Did you take out the upstream o2 sensor or downstream?

twystyd · 07-14-2012, 06:19 PM

No, I left all the o2 sensors in. I just unplugged the pigtail that had the broken wires to the rear one passenger side. It was smoking before that anyways. It only started this smoking thing after the catalytic converter blew out and I removed it.

XSELLR8 · 07-15-2012, 02:01 AM

...so what do you mean by "blow out?" white smoke? Sounds like a head gasket.

TMac · 07-15-2012, 06:27 PM

Blew out as in he blew the inside of the cat out if I had to guess.

twystyd · 11-16-2012, 01:46 PM

Correct. The cat filter, or whatever is inside it literally came undone inside and was rattling around. Now both of them are cut off and I spliced in flex pipes where they used to be. I'm pretty sure the smoking is coming from a valve seal leak on the drivers side head. So now, I have a loud *** exhaust and it smokes a little. It's one problem after another with this car. I'm debating on selling it and buying a terminator if any more problems arise.

Sent from my Galaxy S3 on AT&T using Tapatalk 2.

07-14-2012, 03:26 PM	#1
twystyd Rice-Cop Join Date: Sep 2011 Location: Brighton, MI Posts: 226	Smoking exhaust I blew the inside of my drivers side cat out and it was rattling around so I cut the cat off and spliced in a new piece of pipe. Then the car started to smoke so I removed the passenger side and spliced in another piece of pipe. While under the car I found the passenger side O2 sensor wire was broken so I just removed it. Still smoking. The smoke is white, and gets more dense when I start back going again, then seems to taper off until I slow up. Any thoughts on what is causing this? I haven't had it tuned so Im leaning toward that being the culprit since I have completely changed the exhaust from stock. 2003 Mach 1 SLP LM1 with BBK high flow mid pipe, now without cats. Stock manifolds.

07-14-2012, 05:12 PM	#2
Mach828 Dark Knight Join Date: Nov 2009 Location: Albuquerque, NM Posts: 5,759	Re: Smoking exhaust Did you take out the upstream o2 sensor or downstream? __________________ Vortech V2 S-trim, E85, A2A Treadstone, Comp cams, built engine, full exhaust, built rear, built 4r70, more mods. Tuned by me with SCT Advantage

07-15-2012, 02:01 AM	#4
XSELLR8 Mach-o-holic Join Date: May 2010 Location: La La Land Posts: 1,276	Re: Smoking exhaust ...so what do you mean by "blow out?" white smoke? Sounds like a head gasket. __________________ 2003 Mach 1 TR 5 Speed IUP Bolt ons: You name it! 4.10s too 2004 Cobra Screaming Yellow 2.3L Whipple Gear install vid https://www.youtube.com/watch?v=tJrAIDCpbDI Clutch Replacement Vid http://www.youtube.com/watch?v=UFr0Rur_EWc Wideband Install Vid http://www.youtube.com/watch?v=GmL1KBmWyhg

07-15-2012, 06:27 PM	#5
TMac Registered User Join Date: Jun 2012 Location: Carmi, IL Posts: 21	Re: Smoking exhaust Blew out as in he blew the inside of the cat out if I had to guess. __________________ Now: Exhaust only 2v Next: Mach 1

07-14-2012, 06:19 PM	#3
twystyd Rice-Cop Join Date: Sep 2011 Location: Brighton, MI Posts: 226	No, I left all the o2 sensors in. I just unplugged the pigtail that had the broken wires to the rear one passenger side. It was smoking before that anyways. It only started this smoking thing after the catalytic converter blew out and I removed it.

11-16-2012, 01:46 PM	#6
twystyd Rice-Cop Join Date: Sep 2011 Location: Brighton, MI Posts: 226	Correct. The cat filter, or whatever is inside it literally came undone inside and was rattling around. Now both of them are cut off and I spliced in flex pipes where they used to be. I'm pretty sure the smoking is coming from a valve seal leak on the drivers side head. So now, I have a loud *** exhaust and it smokes a little. It's one problem after another with this car. I'm debating on selling it and buying a terminator if any more problems arise. Sent from my Galaxy S3 on AT&T using Tapatalk 2.

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