Power sometimes
Thread Starter
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Junior User
Joined: Sep 2007
Posts: 86
Likes: 0
From: Kissimmee FL.
Power sometimes
At times when taking off from a stop the truck will take off like it wants to go,go,go 
and then the next time taking off from a stop it wants to take off like it is not getting boost or something
. I have unhooked the ebvp and mech. wired it opened, but still does it. What else should I do? Could it be the mapp sensor going bad? 
and then the next time taking off from a stop it wants to take off like it is not getting boost or something. I have unhooked the ebvp and mech. wired it opened, but still does it. What else should I do? Could it be the mapp sensor going bad?
Thread Starter
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Junior User
Joined: Sep 2007
Posts: 86
Likes: 0
From: Kissimmee FL.
Same with mine, no codes. But at times mine runs great. Also in park if I rev it up holding it to the floor it will sputter and blowout bluish smoke @ around 2500 & up once it tops out it clears up.
Posting Guru
Joined: Sep 2004
Posts: 1,096
Likes: 2
From: Ohio
numerous issues can cause this. Low oil, air in the HP side if you have taken out a injector or such. Can also be caused by air geting into the fuel system intermittently, from a broken or cracked pick up tube, possibly even a loose fitting. Can be causedd by injectors going bad, intermittent short in UVCWH, even a bad potentiometer in the pedal.
Check a few of those things, also as stated above, cracked vaccum line to map sensor, but map sensor will normally run bad, or good, not both. Even a dirty CPS can cause this , but only ever seen that once or twice............
Check a few of those things, also as stated above, cracked vaccum line to map sensor, but map sensor will normally run bad, or good, not both. Even a dirty CPS can cause this , but only ever seen that once or twice............
Thread Starter
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Junior User
Joined: Sep 2007
Posts: 86
Likes: 0
From: Kissimmee FL.
I do beleive the injectors may have issues. It has 198+ miles on them. How much does the orings cost for the injectors? And what does UVCWH stand for? The pick uptubes are good had the tanks down for my filter light problem about a month ago. MAPP sensor hose is new along with fuel hoses and lift pump (3rd lift pump).
Thread Starter
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Junior User
Joined: Sep 2007
Posts: 86
Likes: 0
From: Kissimmee FL.
I do beleive the injectors may have issues. It has 198+ miles on them. How much does the orings cost for the injectors? And what does UVCWH stand for? The pick uptubes are good had the tanks down for my filter light problem about a month ago. MAPP sensor hose is new along with fuel hoses and lift pump (3rd lift pump).
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Senior User
Joined: Nov 2007
Posts: 337
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From: Mt. Airy MD
I do beleive the injectors may have issues. It has 198+ miles on them. How much does the orings cost for the injectors? And what does UVCWH stand for? The pick uptubes are good had the tanks down for my filter light problem about a month ago. MAPP sensor hose is new along with fuel hoses and lift pump (3rd lift pump).
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Elder User
Joined: Dec 2008
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From: Ocala
I do beleive the injectors may have issues. It has 198+ miles on them. How much does the orings cost for the injectors? And what does UVCWH stand for? The pick uptubes are good had the tanks down for my filter light problem about a month ago. MAPP sensor hose is new along with fuel hoses and lift pump (3rd lift pump).
As for the MAP if it is bad, you can unplug the sensor. It will throw a CEL but wont hurt the truck. I know this from having problems with mine. If it runs better its probably your problem, if it runs worse its prolly still good.
Cargo Master
Joined: Aug 2004
Posts: 3,455
Likes: 8
From: Williams Lake B.C.
At times when taking off from a stop the truck will take off like it wants to go,go,go and then the next time taking off from a stop it wants to take off like it is not getting boost or something. I have unhooked the ebvp and mech. wired it opened, but still does it. What else should I do? Could it be the mapp sensor going bad?
and then the next time taking off from a stop it wants to take off like it is not getting boost or something. I have unhooked the ebvp and mech. wired it opened, but still does it. What else should I do? Could it be the mapp sensor going bad? I just spent 2 months fooling around with the EXACT same problem and I had the epbv wired shut instead of open.
Read my thread in this section called "No power" and see if it's the same.
Cargo Master
Joined: Aug 2004
Posts: 3,455
Likes: 8
From: Williams Lake B.C.
If you are looking down on it , turn it clockwise.