5.0 performance
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Elder User
Joined: Jul 2003
Posts: 599
Likes: 0
From: VB. Virginia
5.0 performance
I can feel a noticeable horsepower difference with my 5.0 depending on the air temp. outside. At one temp it runs great plenty of power, another day it feels like a slug. My brothers 5.0 F150 is the same way. Is this normal with the eec.IV computers.
Elder User
Joined: Jan 2005
Posts: 656
Likes: 1
From: Houston
I have post all over this site with this same problem. I have the 5.8, it is driving me crazy. It drives great until she warms up, then I have to floor it to make her move. Half throttle she feels like she wants to go slower. I have given up on this problem I have tunned her up, new TPS, cleanned the TB, new filter, had my exhaust checked. Now she is in the hospital for complete scan. I should here from them some time this morning. I will post my results. I have had a lot of advise on this fourm, but I am just not a good enough mechanic to get it solved. I hope it is not something major. I have a feeling it is going to be a combination of two or more things.
Elder User
Joined: Jan 2005
Posts: 656
Likes: 1
From: Houston
Ok the shop called me. I don't have clogged cats, I have a clogged muffler. In the front of the muffle there is a leak. There is more exhaust comming from the front of the muffler than the tail pipes. They stopped the dyanostic testing and told me I would have to get that fixed first before they could test any more. they charged me nothing and now she is in the muffler shop getting flowmasters and dual exhaust. The mechanic said that this might be my whole problem with the poor performance. we will see. I will be picking her up in about an hour.
Senior User
Joined: Mar 2004
Posts: 146
Likes: 0
From: Norristown, PA
I think the poor performance may be related to dampness/humidity in the air. Just a few days ago it was rainy and slightly humid. My truck ran lousy. Now today, it's more cold and less humid and the truck runs better. Go figure.
More Turbo
Joined: Oct 2004
Posts: 621
Likes: 2
From: Marana, AZ
Actually cold humid air is much better for performance than say, hot dry is. When air is cooled and moist it is condensed which mixes better with fuel, hot dry air is thin and you don't get the proper fuel/air mixture. If your truck is running lousy on cool damp days you might have a electrical problem that doesn't like the damp situation. I've known race car drivers who have rigged up a line that sprays a very fine mist of water into their carbs to increase their horsepower.
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Senior User
Joined: Dec 2003
Posts: 172
Likes: 0
From: Los Angeles
ditto desertdave -- Denser (colder) the air the more horsepower you will get. Air Charge Temp Sensor will tell the ECU to get you more optimal Air/Fuel Ratio. Thinner/Dry air will lower your AFR. Keeps it from getting hotter from a already hot weather. just like your water thermastat.
The fine mist of water you are taking about is a water injection kit. use to cool down the intake air with a stage 1 turbo system. The turbo system creates lots of heat than blow it through the intakes. Which the mist cools the intake air before going into the engine.
Originally Posted by desertdave35
I've known race car drivers who have rigged up a line that sprays a very fine mist of water into their carbs to increase their horsepower.
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Cargo Master
Joined: Nov 2003
Posts: 2,000
Likes: 38
From: North Dakota
Ya, it mostly has to do with the fuel/air mixture and air temp. My truck always seems to run better on cold dense air. Right now my truck runs great, but wait till summer here. When it get past 110* in the summer you think that you are driving a four cylinder. That is with the A/C on of course. Those hot days when you have not started your truck in a few and the temp. guage shows it up to temp. because it is so hot outside stinks! I will usually run mid-grade or premium in the summer to help stop the heat pinging and for better performance.
Cargo Master
Joined: Nov 2003
Posts: 2,000
Likes: 38
From: North Dakota
Ya, it is the insulated tape, I got it on mine. It helped a little, but when the temp hits triple digits, it don't matter. I am just glad my truck does not overheat in the summer, my aluminum radiator took care of that.
even with a triple core radiator it runs hot with the A/C on.