Something is definitely Wrong... '91 GT - MustangForums.com


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.

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Old 05-03-2013, 06:35 PM   #1
TripleG
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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
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Old 05-03-2013, 06:38 PM   #2
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In video 1, when the car gets close to dying, that was me pushing on the throttle housing in the opposite direction...
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Old 05-03-2013, 07:25 PM   #3
mattdel
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Its mechanical in nature, and goes away with throttle, so its a moving part, possibly oiled. Broken valve spring/seat ?
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Old 05-03-2013, 07:48 PM   #4
Maxwelhse
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Under the hood it sounds like a heinous exhaust leak to me....

You still have your EGR cross over tube?
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Old 05-03-2013, 07:54 PM   #5
89StangGTConvertible
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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...
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Old 05-03-2013, 08:24 PM   #6
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Definitely a valve train issue. Pop that intake off and valve covers....time to get dirty.
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Old 05-04-2013, 12:07 AM   #7
pedalhappy
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yep under the valve covers
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Old 05-04-2013, 12:56 AM   #8
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I'd go with valve-train here too.
Look real careful at pushrod/rocker arm...........
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Old 05-04-2013, 05:59 PM   #9
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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?
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Old 05-04-2013, 06:41 PM   #10
TripleG
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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.
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