460 is lazy
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Elder User
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460 is lazy
My 95 F250 has been driving me nuts. I just gave it a tune up with new everything on the secondary ignition system and set the timing. It seemed to have more power for a while, but now is acting just like it did before. I was going to check the timing again to see if it changed. I was going up a approx. 7% grade in 4th gear (1:1 with 4.10 rear) unloaded, and it couldn't keep up. It was losing speed. My old diesel could gain speed on that hill.
Also, when starting, it misses for a few seconds until it finally fires on all the cylinders and takes off. I kill it all the time because I start to go and it misses and dies on me. If I rev it and wait a minute, it's fine.
I have a new exhaust on here and a new air filter as well. It does it on both tanks which must rule out a fuel problem, right?
Also, when starting, it misses for a few seconds until it finally fires on all the cylinders and takes off. I kill it all the time because I start to go and it misses and dies on me. If I rev it and wait a minute, it's fine.
I have a new exhaust on here and a new air filter as well. It does it on both tanks which must rule out a fuel problem, right?
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doing it on both tank wouldnt rule out fuel issues. the fuel filter operates for both tanks as do the injectors. i would say its time to start looking to clean your injectors and get a new fuel filter, i'm guessing you replaced your plugs. bad plugs and dirty injectors/ filter could cause missing
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Originally Posted by Conanski
Has the check engine light ever been on? Ever? If so you need to pull the codes and find out what the computer saw.
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Originally Posted by capn kirk
doing it on both tank wouldnt rule out fuel issues. the fuel filter operates for both tanks as do the injectors. i would say its time to start looking to clean your injectors and get a new fuel filter, i'm guessing you replaced your plugs. bad plugs and dirty injectors/ filter could cause missing
A fuel problem like that wouldn't clear up after running though.
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Joined: Jun 2006
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From: Ottawa, Ontario
Originally Posted by mgraveman
Also, when starting, it misses for a few seconds until it finally fires on all the cylinders and takes off. I kill it all the time because I start to go and it misses and dies on me. If I rev it and wait a minute, it's fine.
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Originally Posted by Conanski
You got a vacuum leak, could be anything from a broken/cracked line to a rusted vacuum canister to a leaking brake booster or something inside the dash.
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From: Ottawa, Ontario
The stock EFI system can only operate properly with a relatively stable vacuum signal, this is the main reason a lumpy cam won't work in these trucks, the low rpm vacuum signal is too weak and the computer can't control the motor.
I had an '89 truck with a similar problem. Even warmed up it would just stall occasionally just as you lean into the throttle off a stop light. If it didn't stall it would chug for a moment and then take off like normal. Turns out it had a pretty major vacuum leak from a rusted out vacuum canister(coffee can).
I had an '89 truck with a similar problem. Even warmed up it would just stall occasionally just as you lean into the throttle off a stop light. If it didn't stall it would chug for a moment and then take off like normal. Turns out it had a pretty major vacuum leak from a rusted out vacuum canister(coffee can).
Last edited by Conanski; Aug 24, 2007 at 03:11 PM.
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