Bad Catalytic Converter?

WhiteFizzo

Founding Member

May 17, 2000

85

0

0

Virginia Beach Va

Apr 4, 2007

#1

• Apr 4, 2007

• #1

If one of the cats on my stock H-pipe has clogged, would I notice on a cold start? Right now when I crank my car after it has cooled completely, i.e. overnight, my car idles fine until it heats up. Once it reaches normal operating temperature, the idle goes to crap and the H-pipe heats up alot more than it use to.

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

31,179

33

129

Apr 4, 2007

#2

• Apr 4, 2007

• #2

If you have a vac gauge, hold the RPM's at 2000+ (but steady) and see if the vacuum reading falls off after 20+ seconds. This would indicate an exhaust restriction, and a clogged cat is likely.

Good luck.

 

8

86bluecobra

Advanced Member

Dec 20, 2004

4,265

12

69

B.C. Canada

Apr 4, 2007

#3

• Apr 4, 2007

• #3

if it is clogging usally they rattle around in there. Just tap the convertor to see if it is rattling around. JUST TAP IT. Don't hammer it at all.

 

Black1987Stang

Active Member

Aug 22, 2004

1,422

0

37

Jersey Shore

Apr 4, 2007

#4

• Apr 4, 2007

• #4

86bluecobra said:

if it is clogging usally they rattle around in there. Just tap the convertor to see if it is rattling around. JUST TAP IT. Don't hammer it at all.

Click to expand...

I agree with him, mine went a month ago (1 of the 4), sounded like a hammer was floating around in my motor, had noo power, it was so quiet I thought it was bone stock, and you could just tell it was choking everything up. Tapped it and u could hear the honeycomb rattling around in there.