Need help diagnosing problem (video) - Page 2

FerociousP · 10-12-2010, 09:05 AM

It was a clogged cat.

FC Zach · 10-12-2010, 10:11 AM

:wil ly_nilly:

Cool, congrats on the diagnosis!

rx4ur7 · 10-12-2010, 05:43 PM

Afraid I have seen plenty of them. Was the classic description by your write up and video confirmed it.
When you pull it, check to see if there is any substraight left, if not check to make sure the screen mesh is still in the cat. The substraights are wrapped in a stainless screen, many times when the cats clear out completely that screen gets blown out. Usually they will get caught at the exit. Some times they do not and get blown into the silencers. (getting them out can be a challange)
This will also happen with the multiple precats, very common where the screen from one or both of them get into the main cat and block it.
Glad you found it.

djmtsu · 10-12-2010, 06:02 PM

Actually....he kinda did it to himself.

Header, RB catback, and a high flow cat.....with the air pump running directly to the cat to pass emissions....and never took it off.

He cooked the cat hardcore.

rx4ur7 · 10-12-2010, 06:32 PM

Yep, that would do it.
No problem with running the air pump, just need to run the air through some sort of ACV/Diverter valve. We used the Ford diverter, cheap and works. Should maintain a check valve also.

10-12-2010, 09:05 AM	#16
FerociousP I-had-a-bad-experience... Join Date: Feb 2008 Location: M'boro Posts: 1,046 Rep Power: 19	It was a clogged cat. __________________ '15 Juke Nismo '06 MX-5 GT SOLD '04 S Silver RX-8 GT Track Day Use SOLD '90 Black TII vert w/ Sprint RE stock port/turbo DD dyno (242.6whp@5500rpm @12psi 8psi@redline) and (250ftlbtq@4800rpm @13psi) SOLD '89 GTUs 6p TII SOLD, '87 sport SOLD, '79 SA stock SOLD '91 B2600i 4x4 w/ Rx-8 LSD SOLD

10-12-2010, 10:11 AM	#17
FC Zach RCC Loves Me Not You Join Date: Mar 2008 Location: Eagleville, TN Posts: 2,267 Rep Power: 20	:wil ly_nilly: Cool, congrats on the diagnosis! __________________ 1993 Yamaha GTS1000 1992 Celica Turbo AllTrac 1987 RX7 Sport 1979 Yamaha G1, KM24 powered 1975 Dolmar KMS4

10-12-2010, 05:43 PM	#18
rx4ur7 Rotary since 1972 Join Date: Nov 2008 Location: Tucson Posts: 231 Rep Power: 17	Afraid I have seen plenty of them. Was the classic description by your write up and video confirmed it. When you pull it, check to see if there is any substraight left, if not check to make sure the screen mesh is still in the cat. The substraights are wrapped in a stainless screen, many times when the cats clear out completely that screen gets blown out. Usually they will get caught at the exit. Some times they do not and get blown into the silencers. (getting them out can be a challange) This will also happen with the multiple precats, very common where the screen from one or both of them get into the main cat and block it. Glad you found it. Last edited by rx4ur7; 10-12-2010 at 05:45 PM.

10-12-2010, 06:02 PM	#19
djmtsu My minds tellin' me no... Join Date: Feb 2008 Location: Murfreesboro, TN Posts: 4,043 Rep Power: 22	Actually....he kinda did it to himself. Header, RB catback, and a high flow cat.....with the air pump running directly to the cat to pass emissions....and never took it off. He cooked the cat hardcore. __________________ 1976 Mazda Cosmo RX-5 1976 Mazda Cosmo RX-5 2003 Toyota Tundra TRD 2015 Toyota 4Runner SR5

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10-12-2010, 06:32 PM	#20
rx4ur7 Rotary since 1972 Join Date: Nov 2008 Location: Tucson Posts: 231 Rep Power: 17	Yep, that would do it. No problem with running the air pump, just need to run the air through some sort of ACV/Diverter valve. We used the Ford diverter, cheap and works. Should maintain a check valve also.