engine miss
Thread Starter
Instructor
Joined: May 2009
Posts: 180
Likes: 1
From: Prairieville Louisiana
engine miss
Well im out of ideas. My stock 76 has an engine miss at constant speeds. When i give it some gas to speed up, it acts like i let off a little and get back on it. I have new plugs, wires, hei ignition module, rebuilt carb. Beginning to think something mechanical like wiped out cam lobe? anyone have an idea before i put it in the shop? Timing appears to be ok also.
thanks
thanks
Last edited by Sho'nuff; Jun 17, 2009 at 01:09 PM.
Melting Slicks
Joined: Mar 2008
Posts: 2,989
Likes: 198
From: Meriden CT
That could be two separate issues. When you step on it to speed up and it actually slows, could be an inadequate accelerator pump shot.
A miss at constant speeds, check the valve springs and do a leak down test, or even just a compression test. Run the motor with a vacuum gage tapped to the manifold vacuum and observe the readings driving down the road (I have duct taped a vacuum gage to the windshield a few times).
Simple tests like these can help alot with diagnosis of a problem.
A miss at constant speeds, check the valve springs and do a leak down test, or even just a compression test. Run the motor with a vacuum gage tapped to the manifold vacuum and observe the readings driving down the road (I have duct taped a vacuum gage to the windshield a few times).
Simple tests like these can help alot with diagnosis of a problem.
Instructor
Joined: Apr 2005
Posts: 200
Likes: 0
From: Finksburg Maryland
True. Hook a vacuum gauge up and see whats happening. This site will give you differnet scenarios of problems found with a vacuum gauge.
http://www.secondchancegarage.com/public/186.cfm
http://www.secondchancegarage.com/public/186.cfm
