Headers, Intake, & Exhaust Custom Exhaust? New Headers? Need Opinions on Intakes? Discuss making your Accord breathe better here.

Bad cat or loose heat shield?

  #1  
Old 11-11-2012, 10:38 PM
Thread Starter
Join Date: Nov 2012
Location: Indiana
Posts: 6
Default Bad cat or loose heat shield?

I just bought a 91 accord, it had a bad exhaust leak when I bought it so I had it repaired, ended up being the flex pipe, which is what I assumed, now that its quiet I have noticed that when I start the car, rev it up, it has an exhaust rattle, It only rattles when I am sitting in neutral revving the engine, or when I'm taking off. If I'm shifting gears at 25MPH plus it is not as noticeable.

Does the heat shield seem to be most suspect?

What are the symptoms of a bad cat?
 
  #2  
Old 11-12-2012, 07:27 AM
JimBlake's Avatar
Super Moderator
Join Date: May 2006
Location: Wisconsin
Posts: 17,503
Default

Loose heatshield or bad cat might sound about the same. You need to get underneath & check. By hitting the heatshields with your knuckles or something like that (don't beat it too hard with a hammer); you can see whether it's the heatshields. Process of elimination can lead you to a broken catalyst.

When you're under there you'll notice there's several heatshields, many of them bolted to the floorpan above the exhaust pipe. Any of them can be loose.
 
  #3  
Old 11-12-2012, 08:52 AM
Thread Starter
Join Date: Nov 2012
Location: Indiana
Posts: 6
Default

Thanks for the help, I will crawl under there in a little while and see what I can find.
 
  #4  
Old 05-17-2017, 07:48 PM
Join Date: Sep 2006
Posts: 5
Default Don't oveloook the Exhaust A pipe from the manifold

I have been chasing a similar "rattle" at approx 2200 rpm for a year. Turned out to be the first pipe coming off the exhaust manifold. Mine lasted 23 yrs (93 Accord SE Coupe) so I can't complain but it nearly impossible to find a decent aftermarket replacement A pipe. Trying my third one this week from Walker. The issue is that there is an internal pipe and external pipe. I have heard it called an "air-gap" pipe to help with sound deadening and heat build up. Outside pipe is in good shape but the inside pipe has rusted and is rattling under load. Good luck !!!
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
bigdawg74
General Tech Help
7
08-19-2011 12:22 PM
Robcie
General Tech Help
4
02-10-2009 07:37 PM
hmrnmky
General Tech Help
9
02-19-2007 08:16 PM
Accord98Retro
Nitrous, Super Chargers, & Turbos
2
09-07-2006 03:57 AM
PIGGEBANK
Headers, Intake, & Exhaust
3
08-14-2006 01:52 AM


Thread Tools
Search this Thread
Quick Reply: Bad cat or loose heat shield?


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

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.