1996 f350 460 speed density computer efi - 460 Ford Forum
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post #1 of 4 (permalink) Old 06-18-2019, 09:51 PM Thread Starter
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1996 f350 460 speed density computer efi

I posted a while back about my truck...I had the engine rebuilt about 20k ago and I installed a comp cam designed for this truck ever since the engine has been in the truck it's not been running like it should....when I first start up the truck after its sit for a few hours I can drive it about 10 to 15 minutes and it runs perfectly all kinds of power and throttle response...but about 30sec before the check engine light comes on it starts missing like the timing is off. You can even hear the sound of the engine is different. and loses power and fuel economy is awful 9mpg at best before it was getting 13.5mpg...I have replaced about EVERYTHING on this truck and am getting very frustrated with trying to get it fixed....If anyone has any idea or suggestions please let me know... my next option is Holley injection system....Thanks...
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post #2 of 4 (permalink) Old 06-19-2019, 03:53 PM
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Originally Posted by Andyfrazier62 View Post
I posted a while back about my truck...I had the engine rebuilt about 20k ago and I installed a comp cam designed for this truck ever since the engine has been in the truck it's not been running like it should....when I first start up the truck after its sit for a few hours I can drive it about 10 to 15 minutes and it runs perfectly all kinds of power and throttle response...but about 30sec before the check engine light comes on it starts missing like the timing is off. You can even hear the sound of the engine is different. and loses power and fuel economy is awful 9mpg at best before it was getting 13.5mpg...I have replaced about EVERYTHING on this truck and am getting very frustrated with trying to get it fixed....If anyone has any idea or suggestions please let me know... my next option is Holley injection system....Thanks...
have you tried swapping the ignition module?

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post #3 of 4 (permalink) Old 06-19-2019, 07:57 PM
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What is the code?

PIP signal?

Sounds ignition related.


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post #4 of 4 (permalink) Old 06-20-2019, 06:03 AM
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Lost my big long reply

basically pip sensor and ignition module can begin to fail only with heat soak at first, yours should be fender mounted icm so its much less prone to heat, but still somone could have installed with dielectric grease instead of thermal paste etc. PIP sensor youve got to tear the whole distributor down, or swap for a known good one to test at least.

This link helped me on my ford 4.9, and will help you become familiar with the system, but likely yours is heat soak related.

https://easyautodiagnostics.com/ford...module-tests-1

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