460 help
Thread Starter
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Senior User
Joined: May 2009
Posts: 387
Likes: 0
From: Albany OR
460 help
I have a 93 f-250 460 for the first start up of the day it takes for ever to crank over tho it cranks a normal speed then closer to the end before it starts up it starts to slow down on cranking then fires up. But when it fires up i have to let it warm up or give it very little gas or it will hesitate or die. What do u guys think i should test. I know i have spark an i know i have fuel because it runs an drives fine when its warm i cant put my foot to the floor an it moves.
ps ill get a vid up next morning when i go to start it,
ps ill get a vid up next morning when i go to start it,
Lead Driver
Joined: Jul 2007
Posts: 7,868
Likes: 9
From: Rhode Island
Could be a faulty engine coolant temperature sensor. Try replacing it.
Also note that adjusting base timing on these engines will also alter injector timing, which could be part of your issue when cold.
Also note that adjusting base timing on these engines will also alter injector timing, which could be part of your issue when cold.
Old School Hot Rodder
Joined: Feb 2006
Posts: 6,472
Likes: 11
From: Exmore, VA
You might want to check your fuel pressure, particularly the leakdown rate. One other thing, see if you can stick a noid light on the injectors. Engine Coolant Temperature sensor could also be a cause. The best diagnostic tool for this could be a good scanner to read live data while this is occuring.
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Senior User
Joined: May 2009
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From: Albany OR
how do i test the leak down rate? an i found out some thing new my tac moves up an down a lot when idling what could cause that.
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Old School Hot Rodder
Joined: Feb 2006
Posts: 6,472
Likes: 11
From: Exmore, VA
460 help
Idle surge is probably caused by a dirty or bad Idle Air Controller. On a 460 it is on top of the plenum inlet housing below the throttle body.
Thread Starter
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Senior User
Joined: May 2009
Posts: 387
Likes: 0
From: Albany OR
Thx for the help but im still stuck it cranks normal now but it take for ever to crank over. The other new thing is some times it dies while drive or idling but will start right back up when i turn the key off an crank it over again.
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Senior User
Joined: May 2009
Posts: 387
Likes: 0
From: Albany OR
Not yet im a just looking for idea to test this weekend i am going to test.
1. engine temp sensor
2. fuel pressure with key to the on position an running an leak down test.
what els can i test fill up my list.
1. engine temp sensor
2. fuel pressure with key to the on position an running an leak down test.
what els can i test fill up my list.
