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05-15-2012, 04:20 PM
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#1 | |
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AF Newbie
Join Date: May 2012
Location: Cottage Grove, Minnesota
Posts: 3
Thanks: 0
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rough idle,low vaccum
I have a rebuilt 350 270 hp engine. Original quadra jet rebuilt and runs rough. Have low vaccum. Help
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05-15-2012, 06:45 PM
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#2 | |
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A990 racer
 Join Date: Mar 2002
Location: Chestertown, New York
Posts: 16,950
Thanks: 25
Thanked 371 Times in 365 Posts
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Re: rough idle,low vaccum
Wow pretty general. vacuum leaks obviously, valves too tight, timing wrong, for starters.
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05-15-2012, 06:52 PM
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#3 | |
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AF Enthusiast
Join Date: Mar 2008
Location: garner, North Carolina
Posts: 3,579
Thanks: 86
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Re: rough idle,low vaccum
Do a smoke test to pinpoint any vacuum leaks.
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05-20-2012, 11:22 AM
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#4 | |
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AF Newbie
Thread starter
Join Date: May 2012
Location: Cottage Grove, Minnesota
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Re: rough idle,low vaccum
Timing is on, Lifters are adjusted correctly and no vacuum leaks around intake.All vacuum lines are plugged. still have rough idle and can not adjust idle mixture screws
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05-20-2012, 01:35 PM
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#5 | |
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A990 racer
Join Date: Mar 2002
Location: Chestertown, New York
Posts: 16,950
Thanks: 25
Thanked 371 Times in 365 Posts
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Re: rough idle,low vaccum
Compression test next. Or short out one wire at a time see if one cylinder does not change the engine speed or roughness.
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05-20-2012, 02:37 PM
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#6 | |
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AF Enthusiast
Join Date: Oct 2011
Location: Ft Lauderdale, Florida
Posts: 953
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Re: rough idle,low vaccum
My 2 cents: Faulty or incorrect PCV valve or hoses. Poor valve seating. Restricted idle passages. Bad coil. This is in addition to everything else mentioned.
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05-20-2012, 05:00 PM
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#7 | |
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AF Newbie
Thread starter
Join Date: May 2012
Location: Cottage Grove, Minnesota
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Re: rough idle,low vaccum
Thanks for your 2 cents. All new hoses and pcv, heads where redone and running hei.
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