Vibration at idle when engine first starts - Mustang Evolution

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Old 12-12-2014, 10:14 PM   #1
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Vibration at idle when engine first starts

When I start my engine, my car vibrates pretty bad. After a few minutes it evens out and has zero to a few vibrations. 2001 3.8 with 177,737 mi. on it. Did spark plugs over the summer. Any help would be great.


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Old 12-13-2014, 12:11 PM   #2
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On engine start up, look, listen for broken vacuum lines. They are fragile and most all crack eventually. They run across the firewall colored black, red, brown. If big enough leak, then spraying a mist (aerosol carb cleaner, Seafoam spray, ect..)near the crack will show itself.
A full PM is always helpful at eliminating any guesses.
-Clean air filter, MAF sensor, clean intake. (Seafoam treatment through vacuum lines once a year helps)
I even added a home made oil filter/separator inline with PCV system.
-New fuel filter. (once a year for me)
-Could be a leak that is effected by expansion/contraction of the engine.
-Seafoam is great for cleaning intake. Techron is the best made for adding to gas tank. Perform treatments shortly before oil changes.
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Old 12-13-2014, 03:13 PM   #3
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Thanks, I'll clean my CAI and MAF sensor and let you know if it helps. I think it might be a bad hose somewhere, so I'll check that out too.


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Old 12-13-2014, 06:16 PM   #4
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Quote:
Originally Posted by Iryan7 View Post
Thanks, I'll clean my CAI and MAF sensor and let you know if it helps. I think it might be a bad hose somewhere, so I'll check that out too.

Seafoam dat bioch. Get a can a Seafoam, a straw, suck some in very slowly through pcv line into intake. Techron treatment in gas tank.
-Those two will only give good help, help diagnose easier, fuel filters are cheap & simple to swap out.
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