Go Back   MustangForums.com > Ford Mustang Tech > 5.0L (1979-1995) Mustang
Sign in using an external account
Register Forgot Password?
Search


5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

Sponsored by Weld Racing


Welcome to Mustang Forums!
Welcome to Mustang Forums.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!


Reply
 
 
 
 
Thread Tools Search this Thread
Old 05-03-2013, 06:35 PM   #1
TripleG
 
Join Date: May 2013
Posts: 5
Default Something is definitely Wrong... '91 GT

I have a 91 GT that recently developed this loud annoying sound on startup. I have searched the net and some people have mentioned a Camshaft Position Sensor...but none specifically for a foxbody 5.0. The sound is similar to videos posted on the CPS, however I have uploaded 3 videos in an effort to solve this quick since it is related to the engine and it is my daily driver.

The noise is definitely not pulley or belt related as it is coming from the driver side of the engine near the firewall. Descriptions of videos will pertain to the stage.

Here's to hoping its not something major...

Video 1

Video 2

Video 3
This ad is not displayed to registered or logged-in members.
Register your free account today and become a member on Mustang Forums!
TripleG is offline   Reply With Quote
Old 05-03-2013, 06:38 PM   #2
TripleG
 
Join Date: May 2013
Posts: 5
Default

In video 1, when the car gets close to dying, that was me pushing on the throttle housing in the opposite direction...
TripleG is offline   Reply With Quote
Old 05-03-2013, 07:25 PM   #3
mattdel
6th Gear Member
 
mattdel's Avatar
 
Join Date: Nov 2006
Vehicle: 1986 LX, 87 GT Hatch, 89 GT Vert
Location: Spfld, MA
Posts: 9,240
Send a message via AIM to mattdel
Default

Its mechanical in nature, and goes away with throttle, so its a moving part, possibly oiled. Broken valve spring/seat ?
__________________
mattdel is offline   Reply With Quote
Old 05-03-2013, 07:48 PM   #4
Maxwelhse
4th Gear Member
 
Join Date: Jan 2007
Location:
Posts: 1,102
Default

Under the hood it sounds like a heinous exhaust leak to me....

You still have your EGR cross over tube?
__________________
'91 GT 5 Speed
Maxwelhse is offline   Reply With Quote
Old 05-03-2013, 07:54 PM   #5
89StangGTConvertible
2nd Gear Member
 
89StangGTConvertible's Avatar
 
Join Date: Jan 2011
Vehicle: 1989 Ford Mustang GT Convertible
Location: Maryland
Posts: 158
Default

sounds like a valvetrain related issue to me... possibly lifters...?? sounds awful... hope you get it figured out quickly... I wouldn't run it too much...
__________________
89StangGTConvertible is offline   Reply With Quote
Old 05-03-2013, 08:24 PM   #6
holyshift
3rd Gear Member
 
holyshift's Avatar
 
Join Date: Jul 2007
Vehicle: 1988,Ford,Mustang
Location: Sandusky,OH
Posts: 893
Default

Definitely a valve train issue. Pop that intake off and valve covers....time to get dirty.
__________________

88 Hatch,Long Rod 308(Scat crank,Oliver Rods,JE Pistons,9.7:1 comp),GT40 SVO Heads,Crane Cam,1.7 rockers,Port matched Vic Jr,650 Holley,plate kit,4r70w,custom converter,Best ET to date: 10.84 @122mph with a 1.45 60'.63n/51f
Yea Dude Racing Big Kid Racing
February 2012 UPR Ride of the Month
holyshift is offline   Reply With Quote
Old 05-04-2013, 12:07 AM   #7
pedalhappy
1st Gear Member
 
Join Date: Feb 2013
Vehicle: 1994 GT 330ish rwhp, Terminator cobra 470rwhp
Location: tennessee
Posts: 144
FTWxKARNAGEx
Default

yep under the valve covers
pedalhappy is offline   Reply With Quote
Old 05-04-2013, 12:56 AM   #8
tinman
5th Gear Member
 
Join Date: Aug 2004
Vehicle: 84 Mustang, 59 Ranchero
Location: Arizona
Posts: 4,072
Default

I'd go with valve-train here too.
Look real careful at pushrod/rocker arm...........
__________________
GOOD,FAST, CHEAP-----------YOU CAN ONLY GET 2 OUT OF 3!!!!!!!!!!!!!!!!
tinman is offline   Reply With Quote
Old 05-04-2013, 05:59 PM   #9
TripleG
 
Join Date: May 2013
Posts: 5
Default

Got the valve cover off and the rocker arms and push rods look ok. Any specific way to inspect these besides visual and checking the security of the components?
TripleG is offline   Reply With Quote
Old 05-04-2013, 06:41 PM   #10
TripleG
 
Join Date: May 2013
Posts: 5
Default

Quote:
Originally Posted by 89StangGTConvertible View Post
sounds like a valvetrain related issue to me... possibly lifters...?? sounds awful... hope you get it figured out quickly... I wouldn't run it too much...
found a great video on the youtube about lifter noise. Going to try the engine flush technique and see if that alleviates the problem. Thanks for the direction.
TripleG is offline   Reply With Quote
Old 05-04-2013, 06:41 PM
MustangForums
Ford Mustang




Paid Advertisement

 
 
 
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Advertising

Featured Sponsors
Vendor Directory
New Sponsors
All times are GMT -5. The time now is 09:22 PM.

© Internet Brands, Inc.


This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. Ford® is a registered trademark of the Ford Motor Company
Emails Backup