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Jul 9, 2011 | 11:04 AM

Cobfree

Thread Starter

Racer

Joined: Feb 2010

Posts: 261

Likes: 0

From: St. Louis Missouri

Back Fire

I had my original 327 rebuilt this past winter includeing the carb. Recently I am getting alot of back fire when the engine in hot and rev. from 600rpms. Also a little hard to start and at 4,500+ RPMs start to fall a little. She runs great until it gets hot (190).
Thoughts!
The carb is a rebuilt Carter.

Jul 9, 2011 | 05:40 PM

baxsom

Le Mans Master

Joined: Jun 2008

Posts: 5,284

Likes: 235

From: Rockledge FL

timing?

Jul 10, 2011 | 09:49 PM

Phlash

Racer

Joined: Oct 2001

Posts: 274

Likes: 2

From: Pampa Tx

Agree! First check timing. It sounds like it is too far advanced. Could also be dwell is not set right.

Jul 10, 2011 | 10:59 PM

hwcoop

Melting Slicks

Joined: Apr 2006

Posts: 2,084

Likes: 14

From: Airdrie Alberta

Or Lean condition caused by bad accelerator pump rubber

Jul 11, 2011 | 03:56 PM

Cobfree

Thread Starter

Racer

Joined: Feb 2010

Posts: 261

Likes: 0

From: St. Louis Missouri

I will have to check the timing tonight

Jul 11, 2011 | 11:18 PM

73, Dark Blue 454

Melting Slicks

Joined: Mar 2005

Posts: 2,838

Likes: 10

From: Austin TX

95% of the time, backfire through the exhaust is lean-out as stated above. Backfire through the carb is usually a timing issue.

Look for a vacuum leak first. There are many places to look since seemingly the entire car runs on vucuum.

Jul 12, 2011 | 08:47 AM

Cobfree

Thread Starter

Racer

Joined: Feb 2010

Posts: 261

Likes: 0

From: St. Louis Missouri

It does backfire through the carb. Vacuums are fun to find.

Jul 12, 2011 | 09:15 PM

glackore

Pro

Joined: Dec 2006

Posts: 694

Likes: 5

From: tx

Vacuum leaks can be found using some carb cleaner around the intake, carb, base plate, etc. The idle will go down when the juice finds the leak.

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Jul 13, 2011 | 08:14 AM

Cobfree

Thread Starter

Racer

Joined: Feb 2010

Posts: 261

Likes: 0

From: St. Louis Missouri

Great idea... Thanks

Jul 27, 2011 | 05:28 PM

#10

Cobfree

Thread Starter

Racer

Joined: Feb 2010

Posts: 261

Likes: 0

From: St. Louis Missouri

Your were correct, the timing was off! Thanks

Jul 27, 2011 | 11:23 PM

#11

scottyp99

Le Mans Master

Joined: Mar 2008

Posts: 5,948

Likes: 72

From: Oxford MA-----You just lost the game!!!!

Quote:

Originally Posted by Cobfree

Your were correct, the timing was off! Thanks

C'mon, don't leave us hangin', how far off was it?

Scott

Jul 28, 2011 | 08:24 AM

#12

Cobfree

Thread Starter

Racer

Joined: Feb 2010

Posts: 261

Likes: 0

From: St. Louis Missouri

Don't know as I gave up and took it to the shop. Then leaving the shop the brakes went out. Joy of a 43 year old car. I will post the answer tonight when I pick it up.