Cause of vacuum flutter at idle? - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
Ford Forum Ford Forum

» Auto Insurance
» Featured Product
» Wheel & Tire Center

Go Back   Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > The Garage - Tech Forums > Engine Specific Tech > Cleveland Tech
Register Home Forum Active Topics Photo Gallery Auto Loans Garage Mark Forums Read Auto Escrow

FordForums.com is the premier Ford Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
Old 07-31-2006, 11:41   #1 (permalink)
Sir Boost-a-Lot
 
JayLo's Avatar
 
Join Date: Feb 2006
Location: Omaha, NE, USA
Age: 37
Posts: 21
Question Cause of vacuum flutter at idle?

It flutters rapidly and constantly at idle (1000rpm).

What could cause it?

The current cam is very mild. The motor doesn’t smoke but does seem down on power. I don’t hear any mechanical noises that are out of the ordinary.

Did I burn a valve?
Could a misfire cause this?
__________________
JL
1973 Cougar XR-7 convertible - 351C, 9:1 CR, 2V heads, Crower Ultra Beast, Weiand X–CELerator, 600CFM Edelbrock Performer, Dynamax long tubes, stock FMX, 3.89s w/ Detroit Locker
JayLo is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 07-31-2006, 17:11   #2 (permalink)
Registered User
 
Join Date: Sep 2005
Location: sydney
Posts: 76
Re: Cause of vacuum flutter at idle?

Try a compression test, if you blew head gasket between 2 cyls it will flutter pretty bad and loose power...
gasxd is offline   Reply With Quote
Old 08-01-2006, 00:20   #3 (permalink)
Registered User
 
xdclevo's Avatar
 
Join Date: Mar 2004
Location: Cairns
Posts: 1,946
Re: Cause of vacuum flutter at idle?

Possibly a few wiped lobes?
xdclevo is offline   Reply With Quote
Old 08-01-2006, 00:22   #4 (permalink)
82XE 351c
 
Join Date: Jul 2004
Location: North Coast, NSW
Posts: 627
Re: Cause of vacuum flutter at idle?

I would also check the PCV valve located at the back of the driver side rocker cover. Sometimes at idle the bearing inside the valve does not sit still and may cause a vacume leak.....
pracy is offline   Reply With Quote
Old 08-01-2006, 04:53   #5 (permalink)
Sir Boost-a-Lot
 
JayLo's Avatar
 
Join Date: Feb 2006
Location: Omaha, NE, USA
Age: 37
Posts: 21
Re: Cause of vacuum flutter at idle?

Update,
I forgot to mention that the car had rarely been started in the last 3 years.

Anyway, I changed the oil which had few miles put still managed to look black and nasty. As soon as I started it up, surprisingly it sounded better. I hooked up the vacuum gauge and to my surprise there is now next to no flutter.

After a quick spin around the block, it feels like it had more power too. It still needs to be tuned with the wideband, but I think my problem is largely resolved.

Could the crappy oil have prevented a lifter from pumping up?

Or was a spring or valve bound up from all of the sitting?

What do you guys think?

Thanks for your help.
__________________
JL
1973 Cougar XR-7 convertible - 351C, 9:1 CR, 2V heads, Crower Ultra Beast, Weiand X–CELerator, 600CFM Edelbrock Performer, Dynamax long tubes, stock FMX, 3.89s w/ Detroit Locker
JayLo is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply

  Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > The Garage - Tech Forums > Engine Specific Tech > Cleveland Tech



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

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
Trackbacks are On
Pingbacks are On
Refbacks are On


Powered by vBadvanced CMPS v3.2.2

All times are GMT -7. The time now is 01:29.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO 3.6.0
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.