looses power and loud rattling noise - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


2000-2005 Discuss your 2000-2005 Bonneville SE, SLE, and SSEi Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

Reply
 
 
 
Thread Tools Search this Thread
Old 03-09-2012, 08:15 AM   #1
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Aug 2009
Posts: 82
Thanks: 0
Thanked 0 Times in 0 Posts
mdbonnie is on a distinguished road
Default looses power and loud rattling noise

I was diagnosing a service engine light and when I took it for a test drive I pegged the peddle. After a few seconds of good power I suddenly lost power, heard a loud rattling sound and saw a cloud of brown in the mirror.

Car idles fine and the loosing power problem seems to get worst the harder I push the car. Under normal driving conditions it seems to run ok and idles fine. Also, I noticed the boost gauge really goes hard over to the red line when it looses power.

The Service engine light problem is solved after I cleaned the egr valve and has not come back. I also replaced the plug wires.
mdbonnie is offline   Reply With Quote
Old 03-09-2012, 09:25 AM   #2
Senior Member
True Car Nut
 
jwfirebird's Avatar
 
Join Date: Dec 2009
Location: western,ny state
Posts: 9,616
Thanked 563 Times in 481 Posts
jwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond repute
Default

sounds like a plugged cat, sometimes you can see them getting red hot when they get plugged, sometimes they rattle if you lightly tap with a hammer
jwfirebird is offline   Reply With Quote
Old 03-09-2012, 10:51 AM   #3
Senior Member

True Car Nut
 
2kg4u's Avatar
 
Join Date: Sep 2006
Location: Windsor, Ontario / Detroit, Michigan
Posts: 4,804
Thanked 220 Times in 181 Posts
2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of
Default

The spike in boost pressure could be a result of increased back pressure caused by a blocked cat. A blocked cat could also give you the rattle and smoke you describe. I think Justin is pointing you down the right path.
2kg4u is offline   Reply With Quote
Old 03-09-2012, 10:52 PM   #4
Senior Member
True Car Nut
 
rjolly87's Avatar
 
Join Date: Jun 2003
Location: Las Cruces, NM
Posts: 6,855
Thanked 298 Times in 246 Posts
rjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant future
Default

I don't think the cat is plugged, I think it just exploded. You should fix it quick, and plan on muffler(*) as well. Please avoid flogging until this is fixed.
rjolly87 is offline   Reply With Quote
Old 03-10-2012, 12:12 PM   #5
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Aug 2009
Posts: 82
Thanks: 0
Thanked 0 Times in 0 Posts
mdbonnie is on a distinguished road
Default

Too bad it didn't explode as I could tell for sure it was bad. I do notice if I drive it easy it does't seem too bad but as soon as I push it a bit, it goes over the edge and the power loss happens with less push on the peddle. The exhaust noise also changes some and it it sounds a bit louder and deeper.

Tapping with a hammer I don't hear a real obvious sound but there is a small amount of something that sounds like a light rattle.

Quote:
Originally Posted by rjolly87 View Post
I don't think the cat is plugged, I think it just exploded. You should fix it quick, and plan on muffler(*) as well. Please avoid flogging until this is fixed.
mdbonnie is offline   Reply With Quote
Old 03-10-2012, 12:21 PM   #6
Senior Member

True Car Nut
 
2kg4u's Avatar
 
Join Date: Sep 2006
Location: Windsor, Ontario / Detroit, Michigan
Posts: 4,804
Thanked 220 Times in 181 Posts
2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of
Default

Not sure what Randall is referring to for your cat exploding, but I still think the issue is a plugged cat.
2kg4u is offline   Reply With Quote
Old 03-10-2012, 01:38 PM   #7
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Aug 2009
Posts: 82
Thanks: 0
Thanked 0 Times in 0 Posts
mdbonnie is on a distinguished road
Default

Yes, muffler shop confirms it is a plugged cat. He did not have a universal model to fit on it but had a aftermarket cat that included the long pipe all the way back to the mufflers for 898. But, he said if I found a cat he would put it on for $100.

I see a magnaflow on Rockauto for $122. Anyone know if this is a good fit?
mdbonnie is offline   Reply With Quote
Old 03-10-2012, 05:56 PM   #8
Senior Member

True Car Nut
 
2kg4u's Avatar
 
Join Date: Sep 2006
Location: Windsor, Ontario / Detroit, Michigan
Posts: 4,804
Thanked 220 Times in 181 Posts
2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of
Default

Its always nice to know what the problem is. That often is the biggest part of fixing your car.

I trust Rockauto. If it does not fit, they will replace it, no questions asked. The main concern is whether or not the cat will set trouble codes, and I am pretty sure Danthurs uses magnaflows with no problems. I think you are okay with magnaflow from Rock Auto.

Don't forget your old cat has value. Offer the muffler shop $50 and he can keep the old cat.
2kg4u is offline   Reply With Quote
Old 03-11-2012, 08:28 AM   #9
Senior Member
True Car Nut
 
jwfirebird's Avatar
 
Join Date: Dec 2009
Location: western,ny state
Posts: 9,616
Thanked 563 Times in 481 Posts
jwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond repute
Default

if its a muffler shop they should be able to make what ever parts needed to adapt to the aftermarket cat.

dont know what the 50 is about. tell him its your cat and you want to keep it and take it to the recyclers and get the money for it.
jwfirebird is offline   Reply With Quote
Old 03-11-2012, 11:57 PM   #10
Senior Member
True Car Nut
 
rjolly87's Avatar
 
Join Date: Jun 2003
Location: Las Cruces, NM
Posts: 6,855
Thanked 298 Times in 246 Posts
rjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant future
Default

When I say exploded, I believe the honeycomb just broke apart. The other concern is when the honeycomb breaks apart, it will get caught in the mufflers if the pieces are small enough.
rjolly87 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
00 looses spark after cranking dupe00 2000-2005 7 01-04-2010 02:45 PM
Loud rattling noise BonnevilleLErocks 1987-1991 8 07-02-2007 12:43 AM
LOUD Rattling, Stalling, poor porformance etc. IKZ 1992-1999 12 04-07-2006 09:56 AM
94 SE Looses ALL electrical power suddenly? Maclover94 1992-1999 8 11-08-2004 08:56 PM
rattling noise from s/c? sneakypete Forced Induction 9 08-28-2004 05:09 PM


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 08:53 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.