460 cam issues
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460 cam issues
I have a '93 f350 5 speed with a 460 that i just put a comp cam rv (part #34-255-5) as my old one lost a couple lobes..
I go the cam broke in for 30 minutes or longer yesterday with no problem, but today it just wants to bog out and run rich. has a rough idle and doesnt make any difference to adjust the distributor.
I checked and couldnt find any vaccumn leaks or coolant in the oil.
I was told by comp cams that mine should have a speed density computer in my truck(cab/chassis version xlt) and that cam will work perfectly.
Is there anyway to tell what kind of computer that i do have?
I go the cam broke in for 30 minutes or longer yesterday with no problem, but today it just wants to bog out and run rich. has a rough idle and doesnt make any difference to adjust the distributor.
I checked and couldnt find any vaccumn leaks or coolant in the oil.
I was told by comp cams that mine should have a speed density computer in my truck(cab/chassis version xlt) and that cam will work perfectly.
Is there anyway to tell what kind of computer that i do have?
Last edited by dodgdatona; Feb 19, 2012 at 12:29 PM. Reason: wrong wording
Mountain Pass
Joined: Jun 2011
Posts: 225
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From: Berryville AR
From what I was told when having an EFI 460(91 speed density) rebuilt, if you change cams & loose even a little vacuum, the computer will act as if you are accelerating, thereby dumping excess fuel through the injectors. MPG drops way on down, it runs like crap, etc.
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Tuned
Joined: Apr 2011
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From: Redmond, WA USA
If it's stock, you have the speed density system.
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hey guys, heres a video of what the motor is doing. It is still running very rough and rich. I have changed the map sensor,throttle, egr,air bypass, etc.. and it still does the same thing. GOPR147422.MP4 - YouTube
Lead Driver
Joined: Jul 2007
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From: Rhode Island
Are you sure you have all the plug wires correct, and that the cam did not change the firing order? Try unplugging the MAP sensor in the mean time. The computer will start guessing fueling based on throttle position and RPM. This will eliminate the vacuum aspects of things (at least as far as the injection is concerned)