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2004 Deville
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194 Posts
Discussion Starter #1
2004 Deville with 40k miles. Engine is idling and running rough , almost like a cylinder is not firing. Cleaned throttle body but no change . No codes . Any ideas ?
 

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White Diamond '03 DHS (with DTS floor shift)
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86,781 Posts
Plugs?
Coil?
Partially stuck open EGR valve?
Vacuum leak?
 

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2011 CTS Coupe FE3, 2003 Thunderbird, Gone 2013 ATS, 02 Deville
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1,328 Posts
with 40,000 miles on the garage queen when was the last time it was driven and then what happened?
 

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Registered
2005 Deville
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21 Posts
Check the vacuum line coming out of the right (passenger) side of the intake manifold. If this line cracks it causes the engine to idle poorly. Due to the location it is difficult to see the crack. I found my leak by pushing in on the hose and closing up the leak, I could tell right away as the idle went back to normal immediately.
 
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