possible clogged pre-cat

Reply Subscribe

Thread Tools

Search this Thread

Oct 2, 2004 | 10:42 PM

KEVS_L98

Thread Starter

Intermediate

Joined: Mar 2002

Posts: 27

Likes: 0

From: IRVING TX

possible clogged pre-cat

My car ('89 coupe stock) runs just fine and all of the sudden it feels like its choked up. The drivers side exhaust manifold is normal operating temp (hot!!!), but the passenger side is just warm (touchable when car is on) could the pre-cats be clogged they are the original ones that were on the car and if so can i change them on my own or is there welding involved?

Thanks as usual guys.

Oct 2, 2004 | 10:51 PM

vader86

Team Owner

Joined: Sep 2001

Posts: 62,171

Likes: 1,735

From: Athens AL

C7 of the Year - Unmodified Finalist 2021

C4 of Year Finalist (performance mods) 2019

If a cat is clogged, then that side is going to be 2x as hot as usual, not the other way around.

I'd do a tune up first.

Oct 2, 2004 | 11:02 PM

KEVS_L98

Thread Starter

Intermediate

Joined: Mar 2002

Posts: 27

Likes: 0

From: IRVING TX

i have done that- plugs, wires, roter, cap, oil, air filter.
anything else you can think of?

Oct 2, 2004 | 11:03 PM

KEVS_L98

Thread Starter

Intermediate

Joined: Mar 2002

Posts: 27

Likes: 0

From: IRVING TX

it almost seems like that side is not firing.

Oct 2, 2004 | 11:05 PM

vader86

Team Owner

Joined: Sep 2001

Posts: 62,171

Likes: 1,735

From: Athens AL

C7 of the Year - Unmodified Finalist 2021

C4 of Year Finalist (performance mods) 2019

Get out a tester and check for fuel and spark to each cylinder.
Check fuel pressure.
Any SES lights?

Oct 2, 2004 | 11:34 PM

KEVS_L98

Thread Starter

Intermediate

Joined: Mar 2002

Posts: 27

Likes: 0

From: IRVING TX

no ses lights at all...
could the coil be bad or any thing like that?

Oct 3, 2004 | 12:53 AM

Coupe89

Melting Slicks

Joined: Sep 2001

Posts: 3,494

Likes: 36

From: Livermore Ca

St. Jude Donor '05-'06

When I had 2 of my cat clogged. It ran but when you push the peddle it would die...

Do you have a pinging problem ?

Oct 3, 2004 | 04:08 PM

KEVS_L98

Thread Starter

Intermediate

Joined: Mar 2002

Posts: 27

Likes: 0

From: IRVING TX

what i pinging?

could the fuel injectors be clogged or malfunctioning?
ignition coil? (still same one originally in the car)

Corvette Stories

The Best of Corvette for Corvette Enthusiasts

5 Best & 5 Most Overrated Corvette Track Packages of All Time!

Joe Kucinski

Every 2027 Corvette Engine Explained

Joe Kucinski

Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette

Verdad Gallardo

10 Ugly Corvettes That We Still Kinda Love

Joe Kucinski

Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

Brett Foote

10 Things Every Corvette Owner Needs (2026 Edition)

Michael S. Palmer

8 Most "Only Corvette Owners Understand" Quirks and Problems

Pouria Savadkouei

10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

Joe Kucinski

How Much Horsepower Every Corvette Engine "LOST" in 1972

Joe Kucinski

Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Michael S. Palmer

Oct 3, 2004 | 04:22 PM

vader86

Team Owner

Joined: Sep 2001

Posts: 62,171

Likes: 1,735

From: Athens AL

C7 of the Year - Unmodified Finalist 2021

C4 of Year Finalist (performance mods) 2019

Yes, check the coil. The injectors can be bad too.

Oct 3, 2004 | 06:36 PM

#10

65Z01

Team Owner

Joined: Dec 2000

Posts: 90,675

Likes: 304

From: SE NY

Cruise-In II Veteran

Check a few spark plugs on each bank to see if it's running the same.

If you don't have a strong visual inspection during emissions testing, replace the stock front Y with a precatless one and the main cat with a high flow 3-stage modern cat.

Reply Subscribe