Pre-Cats

Reply Subscribe

Thread Tools

Search this Thread

Oct 7, 2001 | 10:05 AM

MelloYellow87

Thread Starter

Advanced

Joined: Sep 2001

Posts: 54

Likes: 0

Pre-Cats

Hello,

How do you know if your pre-cats or main cat are failing... Is there anything to look for???

Thanks Joe D. :confused:

Oct 7, 2001 | 11:35 AM

traxx1

Racer

Joined: Apr 2001

Posts: 413

Likes: 0

From: glendale Arizona

Re: Pre-Cats (MelloYellow87)

If your car idels ok but falls on its but when probably cats, a bad smell, probably cats, best bet is to get new y pipe minus cats and install a high performance cat, did mine and it passes Arizona emissions easly and there is a sotp differance also.

:jester :jester :jester

Oct 7, 2001 | 11:53 AM

95vettski

Safety Car

Joined: Mar 1999

Posts: 3,600

Likes: 170

From: Toronto, Canada

Re: Pre-Cats (traxx1)

If it smells like 'rotten eggs' that's a good indication. Also, you can try tapping the converter if you hear pieces moving around that's not good either.

Oct 7, 2001 | 11:55 AM

tsquare

Pro

Joined: Jan 2001

Posts: 674

Likes: 0

From: Pleasant Hill,CA,USA

Re: Pre-Cats (MelloYellow87)

You can hear a metallic rattle sound.

Oct 9, 2001 | 01:02 AM

Lexdog

Instructor

Joined: Sep 2001

Posts: 128

Likes: 0

From: Pittsburgh PA

Re: Pre-Cats (traxx1)

Traxx1,

What kind of Y pipe and cat did you put on your car and where did you get them? I was interested in doing that to my 91 and also putting on some Flow Masters on.

Oct 9, 2001 | 08:52 AM

joecaver

Team Owner

Joined: Oct 2000

Posts: 44,772

Likes: 1

From: 63.8% of all statistics are made up on the spot.

St. Jude Donor '08-'10

Re: Pre-Cats (Lexdog)

Ecklers has the front 'y' minus the pre cats. It comes with the high performance main cat, stock number 34198. It fits 86- 91 and cost 249.99. I just put it on my 90. It was on my door step 3 days after I called them.

[Modified by joecaver, 6:53 AM 10/9/2001]

Oct 9, 2001 | 04:31 PM

Rick86

Burning Brakes

Joined: Nov 2000

Posts: 855

Likes: 0

Re: Pre-Cats (MelloYellow87)

You can also take your car to a muffler shop and have them check the back pressure or if your a DIY guy then you can check back pressure by hooking up a pressure gauge to the bung where O2 sensor goes or you can check for good vacuum.

Oct 9, 2001 | 04:46 PM

ZylaRace

Drifting

Joined: Mar 1999

Posts: 1,931

Likes: 1

From: Norcross GA

Re: Pre-Cats (Rick86)

When the engine won't rev,.... When the exhaust manifold (header) glows red,.. Least one of U cats is glogged.

You should be able to see light through the main cat.
You don't need precats to pass emissions.
Precats do little other than add weight and a fair amout of back pressure.