Vacum/idle?
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Freshman User
Joined: Feb 2004
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Vacum/idle?
I have a '95 Bronco with a 351W with speed density. I bored .030, new rv cam, gasket match. Ever since the rebuild I have had problems with the idle. I used a Snap-On scan tool to find any codes and found none. I thought I might have a vacum leak so I used propane, water, starter fluid and checked every vacum line with a hand held vacum pump and no vacum leak to be found. I put a vacum gauge on it and it tells me I have a vacum leak. Someone told me I may have got a to egressive cam for the computer for the speed density system to compensate for. Can someone clear this up for me? I don't have the cam info here at the house. It it is needed I will put it on next time.
Cargo Master
Joined: Oct 2003
Posts: 2,833
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From: Jefferson, Iowa
You would know if you got that big of a cam. Usually when the cam is having vacume problems, it will lope at idle, atleast in my expiriences, but the efi might be compensating. That could be your idle problem too.
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I did call and they told me that their computer listed the cam as the one I wanted.
I do have a slight "lope" and I do think that is what is causing my vacum problem.
I do have a slight "lope" and I do think that is what is causing my vacum problem.
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The needle on the guage is towards the bottom of the guage. Like I said the guage says that its got a pretty bad vacum leake. The way the guage reads you would think that the leak would be easy to find.
Posting Guru
Joined: Jul 2003
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From: Independence, MO
it would help alot to know that actual vac. readings and the cam specs. but just for the record, there are very few after market cams that will run with speed density system with out causing problems. DW