MAP sensor and vacumm leaks
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New User
Joined: Jan 2004
Posts: 24
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From: Massachusetts
MAP sensor and vacumm leaks
I have a 1995 Ford F350 Dually 460 EFI thats falling apart fast. I have a few more questions on my quest to make this truck run more like an 8 cylinder and less like a 4 cylinder with bad compression. So far I have ......Replaced the Alternator,
Replaced the Idler Pulley, Belts, Attempted a simple tune up snapping 2 plugs off in the head, drilling one of them out too big for the insert because I listened to a local auto parts guy instead of taking a pair of calipers and measuring the tap. and finally Replaced the fuel rail.
So.... I was driving this truck this past snow storm on the highway and all of a sudden it started running like crap and lacked even more power then usual. It now runs extremely rough and lacks power. I send the pedal to the floor and it smells super rich. I also have had the upper intake manifold off recently to replace the fuel rail. (pin hole at the fuel pressure regulator).
Could it be.... M.A.P sensor, Vacumm Leak or should I be looking somewhere else. Also where and what does the M.A.P sensor look like. and How do you find a vacumm leak on a efi system.
thanks once again
Replaced the Idler Pulley, Belts, Attempted a simple tune up snapping 2 plugs off in the head, drilling one of them out too big for the insert because I listened to a local auto parts guy instead of taking a pair of calipers and measuring the tap. and finally Replaced the fuel rail.
So.... I was driving this truck this past snow storm on the highway and all of a sudden it started running like crap and lacked even more power then usual. It now runs extremely rough and lacks power. I send the pedal to the floor and it smells super rich. I also have had the upper intake manifold off recently to replace the fuel rail. (pin hole at the fuel pressure regulator).
Could it be.... M.A.P sensor, Vacumm Leak or should I be looking somewhere else. Also where and what does the M.A.P sensor look like. and How do you find a vacumm leak on a efi system.
thanks once again
Postmaster
Joined: Nov 2001
Posts: 4,742
Likes: 8
From: OK
Since you smell unburned fuel, I'd look first at the ignition system. Try the easy stuff first... check to make sure one or more plug wires haven't come loose; pull plugs to see if any are fouled; check the timing; etc.
Also, I once purchased a brand new set of spark-plug wires of which two were bad. Strange things can happen.
Also, I once purchased a brand new set of spark-plug wires of which two were bad. Strange things can happen.
