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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Speed density

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Old Mar 18, 2015 | 04:55 PM
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Speed density

Okay so I have a 93 F150 4 x 4 302. I want to know what sensors and systems are involved with the speed density. I have search the Internet up-and-down couldn't find anything of use. I do want to keep it speed density because of the better throttle response. Any advice would be wonderful thank you.
 
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Old Mar 18, 2015 | 05:39 PM
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MAP, ECT, ACT, TPS, EVP, O2, TOT & VSS (E4OD transmission).

What are you trying to accomplish here?
 
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Old Mar 18, 2015 | 06:07 PM
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Im wanting to "rebuild" the speed density system because of the better throttle responce and simply because its got 253,591 miles on it. It could use some freshing up imo.
 
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Old Mar 18, 2015 | 06:30 PM
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If everything is working as it should and nothing has been neglected plus all the sensors check out okay it would be a waste of good money to replace them all if you ask me. What engine do you have? 300 inline 6? 302? 351?
 
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Old Mar 18, 2015 | 08:51 PM
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Originally Posted by Shadow944795
If everything is working as it should and nothing has been neglected plus all the sensors check out okay it would be a waste of good money to replace them all if you ask me. What engine do you have? 300 inline 6? 302? 351?

Plus the new one's are junk anyway imo.
 
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Old Mar 18, 2015 | 10:09 PM
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The truck is a 302. Its got a lot of problems that i want to adress. The speed density system is the starting point i have chosin. How can i tell if the o2 sensor is bad?
 
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Old Mar 19, 2015 | 08:20 AM
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Originally Posted by Sixtone
How can i tell if the o2 sensor is bad?
Emission related sensors (like the O2 sensor) will cause the "Check Engine" light to trigger. I presume your CE light illuminates when your turn your key on?

Still not sure what 'problems' you are trying to address though.
 
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Old Mar 19, 2015 | 10:08 AM
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Originally Posted by LeoJr

Still not sure what 'problems' you are trying to address though.
X2......

What issue(s) are you having?

Have you checked for codes?
 
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Old Mar 19, 2015 | 03:12 PM
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The truck runs really choppy. The spark plugs are brand-new. The wires are 8 1/2 mm brand-new. it has great throttle response but is very choppy when it's running. By choppy I mean it runs like it's missing. After it warms up it runs fine no problems.
 
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Old Mar 19, 2015 | 03:25 PM
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Did you replace the distributor cap and rotor along with the plugs and wires? I had a 89 F150 with the inline six that would run very choppy as well, but after a full tune up (plugs, wires, distributor cap, rotor) it ran fine. Most misfires in the ignition system will present themselves under a hefty throttle load because the weak spark does not have enough volts to ignite the air/fuel mixture under load.
 
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Old Mar 19, 2015 | 03:37 PM
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Its got brand new MSD brass cap and rotor with a new MSD coil.
 
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Old Mar 19, 2015 | 05:26 PM
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Double check the spark plugs wire routing. Do you know the firing order?

(Not trying to insult, just asking.)
 
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