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Jul 15, 2012 | 03:35 PM

colliedogg

Thread Starter

Heel & Toe

Joined: Jul 2012

Posts: 16

Likes: 0

From: pacific WA - Washington

stumped

77 corvette engine runs rough,the distributor was junk so I put in a new one and new wires.I have disconnected all the vacuum lines but it made no difference still has an intermittent miss all rpm's any suggestions? engine has 7k, also readjusted valve lash. recently when I tap the gas a couple times I can get a backfire thru the carb. ?

Last edited by colliedogg; Jul 15, 2012 at 03:42 PM.

Jul 15, 2012 | 06:14 PM

scottyp99

Le Mans Master

Joined: Mar 2008

Posts: 5,948

Likes: 72

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

Double check firing order.

Keep the shiny side up!

Scott

Jul 15, 2012 | 06:59 PM

'75

Le Mans Master

Joined: Dec 2007

Posts: 6,422

Likes: 591

From: McHenry Illinois

Quote:

Originally Posted by scottyp99

Double check firing order.

Keep the shiny side up!

Scott

18436572

Jul 15, 2012 | 08:21 PM

KevinK

Drifting

Joined: Jun 2007

Posts: 1,404

Likes: 1

From: Ansonia/NYC CT

Next check are spark plugs. I went with accell shorty style plugs, only to realize they were the wrong ones, too short to get into my cylinder heads. After the spark plugs,the next check area is fuel pump/filter. Your problem is either timing, or fuel delivery, IMO.

Jul 15, 2012 | 08:23 PM

KevinK

Drifting

Joined: Jun 2007

Posts: 1,404

Likes: 1

From: Ansonia/NYC CT

If fuel filter (2.50)is not the issue, run it at night, pop the hood, and look for flashes in the boot area...could be bad arch over.

Jul 15, 2012 | 08:32 PM

colliedogg

Thread Starter

Heel & Toe

Joined: Jul 2012

Posts: 16

Likes: 0

From: pacific WA - Washington

firing order is fine,I have checked every thing I can think of. it starts fine just has an intermittent miss at idle and up, tends to run hot even with a 160 thermostat radiator is fine plenty of flow starting to think the motor got put together one tooth off on the timing chain only thing that makes sense, really gutless secondary's open really slow,or carb with a vac leak I cant find,this one has me going in circles. only back fires lightly one time thru carb when I romp on it let off and do it again? brand new plug wires good ones. plan on replacing Q-jet with new carb suggestions?

One plug was wrong one, replaced it no help. will check fuel pressure tomorrow.

Last edited by colliedogg; Jul 15, 2012 at 08:41 PM.