OhNo- 5-0

New Member
Jul 26, 2013
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For those who care to take a guess at the issue or have seen this issue before!-

As warmer weather nears, I'll be fiddling with the car to get more info. Here are the specs/ concerns:

-88 original 5.0 car Paxton novi 1000 supercharged with FMU
- (No chip in ECU)
-Car is still speed density

Issue: After reaching NOT, the car sputters at maybe 2300rpm-3000 rpm (sounds almost like fuel cut) . Before and after those rpms, car has good power and runs fine

Again, if anyone feels confident they have a good test for me to do before I begin to do the diagnostics, your knowledge would be greatly appreciated!!
 
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jrichker

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Mar 10, 2000
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Dump codes sticky.

Look at the top of the 5.0 Tech forum where the sticky threads are posted. One of them is how to dump the computer codes. I highly suggest that you read it and follow the instructions to dump the codes.
 

7991LXnSHO

5 Year Member
Sep 1, 2010
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Can you even run a speed density with a supercharger? That seems likely to exceed the stock computer's programming if changing c/h/I will.
 

Mustang5L5

This is a big reason why I pulled it out
Mod Dude
Feb 18, 2001
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Step #1, run the codes


But, gonna go out on a limb here and guess that a supercharged setup on a stock SD system might be part of the reason. I'd run the codes first, aside from anything else obviously wrong, I'd suggest a Mass Air conversion to start
 

7991LXnSHO

5 Year Member
Sep 1, 2010
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Kearney, NE
Yep, that's exactly what I was thinking. Unless he left something important off the list...

But we'll hopefully hear the codes.