bad cat, and lack of power - Ford F150 Forum - Community of Ford Truck Fans

Go Back   Ford F150 Forum - Community of Ford Truck Fans > Late Model F150s > 1997 - 2003 Ford F150
Log In 

bad cat, and lack of power

Thread Tools Search this Thread
Old 09-07-2011, 10:16 AM   #1
Junior Member
Join Date: Jun 2011
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Default bad cat, and lack of power

One of the cats are rattling away pretty bad, so if I axe both on that side what will happen with the performance due to the same readings from the o2 sensors?
Other than that its lacking on power. It was running like hell, so I switched out the clutch, slave, starter, one of the coil packs, leads, cleaned the throttle body, new fuel filter, and new plugs but I'll replace them with something better. I found that the nut that bolts the egr onto the exhaust manifold rusted away underneath that piece of cloth so I did a temporary fix. It's a hundred times better now, but still a little low on midrange torque. Maybe its just not burning all the fuel cause the cheapo plugs. 1997 4.6
tengsr is offline   Reply With Quote
Join F150 Forum

Join Today - It's Totally Free!

Are you a Ford F150 fan? If so we invite you to join our community and see what it has to offer. Our site is specifically designed for you and it's a great place for Ford F150 Fans to meet online.
Once you join you'll be able to post messages, upload pictures of your truck, and have a great time with other Ford F150 fans. Whether your an old timer or just bought your F150 you'll find that is a great community to join. Best of all it's totally free!

Join Today! - Click Here JOIN FOR FREE

Old 09-07-2011, 12:13 PM   #2
Senior Member
5 Year Member
otto457's Avatar
Join Date: Apr 2009
Posts: 3,685
Thanked 127 Times in 63 Posts
Feedback Score: 0 reviews

If you're going to remove the cats it has to be done on both banks and not just one side. The imbalance from different velocities causes some bad results. Also if you get rid of both the flow past the front O2 will be altered leading to funny a/f ratios being made on that side, again possibly leading to more problems. Either remove both sides all of them and get tuned for it (not my first choice), get stock replacements (good but more costly), or get aftermarket cats like 94106 Magnaflows and put them in place (most cost effective).
2007 supercab 5.4L, 2wd, Gotts mod, Derale efans, 3" SI/SO exhaust, Gryphon by PHP

Questions about exhaust? Read here first:
otto457 is offline   Reply With Quote
Old 09-07-2011, 10:38 PM   #3
I live 4 Him He died 4 Me
97SlowWhite's Avatar
Join Date: Aug 2011
Location: Rio Grande City, Tx
Posts: 518
Thanks: 0
Thanked 1 Time in 1 Post
Feedback Score: 0 reviews

remove the cats to see how she runs, if she runs good. replace the cats with new ones
'97 Scab, Slow 4.6L, Soon Will Be Resurrected
Not everyone who says to me, "Lord, Lord" will enter the Kingdom of heaven, but only he who does the will of my Father who is in heaven.
97SlowWhite is offline   Reply With Quote

Similar Threads
Thread Thread Starter Forum Replies Last Post
Texas: 2012 F150 FX4 Ecoboost - Loaded OptimiStick 2009 - 2014 Truck Sales 2 10-07-2015 06:09 PM
North Central: 2009-2014 XLT Ford OEM Tow Mirrors yamahatim 2009 - 2014 Part Sales 6 09-12-2015 11:46 PM
tired 5.4....more power? cheap? hartfordf150 1997 - 2003 Ford F150 18 09-11-2015 03:54 PM
No Power and stutter at 45-50 again??? vegasdom 2004 - 2008 Ford F150 3 09-07-2015 01:01 AM
Classic GRM article demonstrates MagnaFlow catalytic converter gains Magna_Flow Aftermarket Products, Reviews & Installation 0 09-03-2015 12:36 AM

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -4. The time now is 12:06 PM.

Copyright 2006 - 20011
This site is in no way affiliated with the Ford Motor Company.