The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > General Truck Forums > Engine & Drivetrain

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 12-27-2011, 09:15 PM   #1
Fangio
Registered User
 
Fangio's Avatar
 
Join Date: Dec 2011
Location: Austin
Posts: 6
New to carbed engines, need some SBC misfire help

First time messing with a carburated engine and need some help troubleshooting. Its a 64 lwb with a Chevy 350 with turbo 350 trans. Engine always starts on first crank and idles great but while accelerating at anything greater than half throttle the engine sputters and misfires. If I back off the throttle it continues to accelerate without issue. It has an edelbrock performer 600 with electronic ignition. Previous owner said he installed new spark plugs adjusted valves, and set timing. All the vacuum lines look to be in good shape as do the plug wires. I haven't spent much time looking at it yet but my initial thought is timing. Any other ideas or maybe a good plan of attack? Thanks in advance.
Fangio is offline   Reply With Quote
Old 12-27-2011, 09:44 PM   #2
Coley
Registered User
 
Coley's Avatar
 
Join Date: Oct 2011
Location: Victoria, B.C
Posts: 3,794
Smile Re: New to carbed engines, need some SBC misfire help

Putting a timing light on it is job 1......are you familiar with the procedure and set targets?
Coley
__________________
....for some men, there is experience, skill and effort....for the others...there is visa and UPS LOL
1966 Chevy 1/2 ton (Florida- Red/white)
1972 Chevy 1/2 ton (California- Blue/white)
2005 Chevy Silverado HD2500/Duramax
2000 Dodge Ram 1500
Coley is offline   Reply With Quote
Old 12-27-2011, 09:52 PM   #3
pat565
Registered User
 
Join Date: Jun 2011
Location: Wembley, Ab
Posts: 53
Re: New to carbed engines, need some SBC misfire help

I have seen this before

The valves are set too tight!
pat565 is offline   Reply With Quote
Old 12-27-2011, 10:16 PM   #4
Fangio
Registered User
 
Fangio's Avatar
 
Join Date: Dec 2011
Location: Austin
Posts: 6
Re: New to carbed engines, need some SBC misfire help

I am familiar with a timing light and how to use one, just dont have one available at my apartment.

Ill put the valves on the list.

For the time being is there anything else I could check and rule out with a multimeter and basic hand tools?
Fangio is offline   Reply With Quote
Old 12-27-2011, 10:25 PM   #5
pat565
Registered User
 
Join Date: Jun 2011
Location: Wembley, Ab
Posts: 53
Re: New to carbed engines, need some SBC misfire help

Ported vacumn leak.
pat565 is offline   Reply With Quote
Old 12-27-2011, 11:30 PM   #6
sapper4
Registered User
 
Join Date: Dec 2011
Location: Hope Mills, NC
Posts: 62
Re: New to carbed engines, need some SBC misfire help

I agree with pat565. It is an advance issue, most likely a ported vacuum leak. You can also check your vacuum pot to make sure it doesn't leak.
sapper4 is offline   Reply With Quote
Reply

Bookmarks

Tags
350, misfire, sbc


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 03:02 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com