Engine bogging out

Harry · 06-12-2001, 12:52 PM

I finally got tired of adjusting my Holly 600 Carb and not getting it right, so I took it to a good carb guy here in town. When I picked it up a few days ago, it ran great! I was really happy.

But now it has developed a problem. In third and fourth gears the engine bogs out really bad when I try to accelerate. It doesn't do it in first or second, and don't know about fifth because I haven't had the chance to take it out on the highway. I called the guy, and he said it was running really rich, and I should try swapping in new plugs first.

So, now my question. If it's running rich, and it has fouled the plugs, why wouldn't it also bog in first and second? And wouldn't running rich mean that I should go to a smaller jet?

Thanks

------------------
See my 1985 Mustang GT

Capri306 · 06-13-2001, 01:16 AM

It depends on vacuum and how your secondaries are set up. You can modify when they open, too. It wouldn't bog in first or second bacause there is significantly less load on the engine at that point. Take a vacuum gauge along for a ride to confirm this if you want. Smaller jets on the secondaries may be your solution...I dunno but it seems you have the same problem most Holley owners have: you have to keep adjusting it for optimal performance. I went with an Edelbrock and haven't looked back since...but that carb is on the ol' Capri which hasn't been run since last fall. Just my .02

------------------
Capri306, Moderator, The Mustang Works Online
1979 Mercury Capri, 5.0L -- C4 -- 2.73
1987 Mustang LX Notch

06-12-2001, 12:52 PM	#1
Harry Registered Member Join Date: Oct 1998 Location: Dayton, OH USA Posts: 678	Engine bogging out I finally got tired of adjusting my Holly 600 Carb and not getting it right, so I took it to a good carb guy here in town. When I picked it up a few days ago, it ran great! I was really happy. But now it has developed a problem. In third and fourth gears the engine bogs out really bad when I try to accelerate. It doesn't do it in first or second, and don't know about fifth because I haven't had the chance to take it out on the highway. I called the guy, and he said it was running really rich, and I should try swapping in new plugs first. So, now my question. If it's running rich, and it has fouled the plugs, why wouldn't it also bog in first and second? And wouldn't running rich mean that I should go to a smaller jet? Thanks ------------------ See my 1985 Mustang GT

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Rare Mustangs....Got One?	1969Mach1	Blue Oval Lounge	22	09-25-2010 04:59 AM
Very bad experience with Engine Dynamics of San Jose CA	JAGraff	Classic Mustangs	8	06-16-2005 11:43 AM
Very bad experience with Engine Dynamics of San Jose CA	JAGraff	Racer's Club House	0	05-12-1999 02:27 AM

06-13-2001, 01:16 AM	#2
Capri306 Moderator Join Date: Sep 1998 Location: Grand Rapids, Michigan, USA Posts: 1,001	It depends on vacuum and how your secondaries are set up. You can modify when they open, too. It wouldn't bog in first or second bacause there is significantly less load on the engine at that point. Take a vacuum gauge along for a ride to confirm this if you want. Smaller jets on the secondaries may be your solution...I dunno but it seems you have the same problem most Holley owners have: you have to keep adjusting it for optimal performance. I went with an Edelbrock and haven't looked back since...but that carb is on the ol' Capri which hasn't been run since last fall. Just my .02 ------------------ Capri306, Moderator, The Mustang Works Online 1979 Mercury Capri, 5.0L -- C4 -- 2.73 1987 Mustang LX Notch