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  #1  
Old 05-29-2013, 01:09 PM
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cat converter

Hello all. Im new to thew forum.
How hard would it be to remove the catalytic converter (whole assembly) form )8 GC 3.7?
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Old 05-29-2013, 05:39 PM
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Re: cat converter

Physically removing it is quite easy...dealing with the consequences, not so much.

I believe you would throw a CEL unless you can turn off some of the system monitors. I am not sure if this would force some of the control systems to go into an open-loop mode or not, causing detriments in performance and fuel economy (some CELs cause this, others do not). I also believe you are more likely to burn through any downstream O2 sensors.

If you have any emissions related testing in your location, you will fail.

This is of course in addition to the needless harm to the environment this would cause, with very little gains (or perhaps losses) to performance.
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Old 05-30-2013, 07:00 AM
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Re: cat converter

I'm replacing the whole assembly. does anyone have any instructions on how to remove it.
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Old 05-30-2013, 08:51 AM
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Re: cat converter

Got it...you want to replace, not remove.

3.7L ENGINE
WARNING: IF TORCHES ARE USED WHEN WORKING
ON THE EXHAUST SYSTEM, DO NOT ALLOW
THE FLAME NEAR THE FUEL LINES.
1. Raise and support the vehicle.
2. Saturate the bolts and nuts with heat valve lubricant.
Allow 5 minutes for penetration.
3. Remove the skid plate.
4. Support the transmission with a suitable lifting
device.
5. Remove the four transmission mount bolts (1).
6. Remove the eight crossmember bolts (2) and
remove the crossmember.
7. Disconnect and mark oxygen sensor electrical connectors.
8. Remove steady rest bracket mounting bolt (5) from
transmission.
9. Remove the nuts from the front exhaust pipe/catalytic
converter assembly to muffler flange.
10. Remove bolts (2) and flanged nuts (1) at the
exhaust manifold.
11. Remove the front exhaust pipe/catalytic converter assembly (3) from the vehicle.
12. Remove steady rest bracket (4) from front exhaust pipe/catalytic converter assembly (3).

Installation is the reverse:

1. Position steady rest bracket (4) onto the front
exhaust pipe/catalytic converter assembly (3).
2. Position the front exhaust pipe/catalytic converter
assembly (4) into vehicle.
3. Install the bolts (2) and nuts (1) at the front exhaust
pipe/catalytic converter assembly (3) to exhaust
manifold flange. Do not tighten.
4. Install the nuts at the front exhaust pipe/catalytic
converter assembly to muffler flange. Do not
tighten.
5. Position the exhaust pipe for proper clearance with
the frame and underbody parts. A minimum clearance
of 25.4 mm (1.0 in.) is required.
6. Tighten front exhaust pipe/catalytic converter
assembly to exhaust manifold bolts (2) to 25.7 Nm
(19 in. lbs.) torque.
7. Tighten the front exhaust pipe and catalytic converter
assembly to muffler flange nuts to 47 Nm
(35 ft. lbs.) torque.
8. Install steady rest bracket bolts. Tighten bolts to 47 Nm (35 ft. lbs.).
9. Connect oxygen sensor electrical connectors.
10. Install the crossmember and install the eight crossmember
bolts (2).
11. Tighten the crossmember bolts to 54 Nm (40 ft.
lbs.).
12. Remove the lifting device.
13. Install the four transmission mount bolts (1) and
tighten to 54 Nm (40 ft. lbs.).
14. Install the skid plate.
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Old 06-17-2013, 02:18 PM
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Re: cat converter

Not worth it man. I removed it from my 5.7 GC...it sounded so nice in the beginning but now its unbearable.
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