holley carb problems - Team Camaro Tech
Troubleshooting Diagnosing problems done here.

 
LinkBack Thread Tools Display Modes
post #1 of 6 (permalink) Old Jan 24th, 04, 02:36 PM Thread Starter
 
Join Date: Aug 2003
Posts: 14
Post

I have a holley 600 carb with vaccum secondaries on a 350 with a small cam. I just changed the power valve in it and cranked it and now it wont idle and loads up but as soon as you open the throttle it goes away. The car has sit for a couple of weeks and needed a power valve so I put it in and now it wont run at idle in park or drive but when you slam the throttle it will run just as ggood as any. I wonder if there is any trash in the carb because I sprayed out the passages in the metering block before I put it back together. There is also a lot of trash and dirt in the see through fuel filter . Please respond because it is driving me craszy and I want to drive my car again.
silver67 is offline  
Sponsored Links
Advertisement
 
post #2 of 6 (permalink) Old Jan 24th, 04, 07:17 PM
Senior Tech
 
Join Date: Mar 2002
Location: Austin, TX, USA
Posts: 5,277
Post

Where did the power valve come from? Sounds like it might be blown. Holleys are famous for blowing power valves. The valve has a small rubber diaphram. One good back-fire and the rubbber diaphram will get a hole blown in it. Newer carbs have a little check ball in the power valve circuit that is supposed to prevent this. There are also kits that can be installed in older cars. In any event, if the power valve is blown it will idle rich.

Dave
========================
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI
dnult is offline  
post #3 of 6 (permalink) Old Jan 25th, 04, 05:40 AM
Senior Tech
 
Join Date: Mar 2002
Location: Austin, TX, USA
Posts: 5,277
Post

Also check to make sure you have a ring gasket properly situated between the power valve and metering block. There should be only one gasket.

If that all looks good you can do what I do to check the power valve. Get a hand vacuum pump and a childs suction dart or similar suction cup. Poke a hole in the cup and stick it on the end of your vacuum line. Then put a little vaseline on the cup and stick it to the back side of the power valve. If you can pull and hold a vacuum on the valve, then it is good.

Dave
========================
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI
dnult is offline  
 
post #4 of 6 (permalink) Old Jan 25th, 04, 11:47 AM
Senior Tech
Steven
 
Join Date: Jan 2001
Location: Raleigh, NC
Posts: 1,046
Post

If the float level is too high, idling can be a problem ... you have to continually rev the car to keep it running ... that's the first place I would start ... Plus, if you have access to compressed air, you can use it to clear passages after you have sprayed them with carb cleaner or dipped them into a can of cleaning solution ...
sdtsdt is offline  
post #5 of 6 (permalink) Old Jan 25th, 04, 01:17 PM
TDW
Senior Tech
Tony
 
Join Date: Sep 2001
Location: Michigan USA
Posts: 410
Post

You should do something about the filter. I would change it or clean it if it is the type that you are able to clean.
TDW is offline  
post #6 of 6 (permalink) Old Jan 26th, 04, 02:39 PM
Senior Tech
dan
 
sixd8rs's Avatar
 
Join Date: Jan 2002
Location: Westminster,Md,usa
Posts: 967
Post

Could be the wrong size power valve also.

68 RS
sixd8rs is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Team Camaro Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address.
NOTE we receive a lot of registrations with bad email addresses. IF you do not receive your confirmation email you will not be able to post. contact support and we will try and help.
Be sure you enter a valid email address and check your spam folder as well.



Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may 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
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome