I did the ICP mod (commonly called 10k mod) on a 97 psd.
The results didn't match what I had expected.
This has led me to believe that a sensor is bad, likely MAP or ICP.

First we put in 10k resistor. Little if any gain.
Then 15.6k, perhaps a little more gain.
At this point there was only little puffs of smoke at low rpm and a seemingly slight gain in low end torque.
Then 22k, little more low end torque and pre-spool puffs of smoke, but still no major gain as expected. Oh and no CEL as of yet, even at WOT.
Then 32k.
Now at this point I would've definately expected lots of pre-spool smoke and CEL at WOT. But no such thing happened. There was just a little amount of smoke, not much more than even the 10k, and NO CEL.
I had not planned on going any higher with the resistance, but in light of these non-results, I went ahead with 42.3k.
At this point I was really only looking for a CEL, but there was none. Finally, the smoke level was what I would've expected at 15.6k, but still only at pre-spool levels. And no CEL.

The truck has been to Ford several times for 'new' injectors, and a surge problem on warm start up (was not fixed). It has a 3" DP and muffler and CAT removed.

What are the tests to do on the ICP and MAP sensors again?
I would think one of those two or maybe even both could be faulty with behavior like this.

I thought about trying the mod on my truck, but without a aftermarket DP I decided against it. Although I had the EDGE in there, lol, this was before I got learned on here, lol. I suppose maybe a slight ICP mod wouldn't hurt.

 

Which 10K mod did you do.
Put the resistor across two of the wires?
Or put the resistor inline with one of the wires?

 

before i got the chip, i tried both. i like it inline better

 

My starting point to test a map sensor is to watch the value with the key on engine not running. That value should be about 15psi at sea level.

 

I don't have access to a scan gauge.

Inline 10K mod.

 

For the MAP unplug the electrical connector. If it drives about the same then it is probably OK. If it has a lot better performance then the MAP or hose is probably bad.

On the ICP just unplug it. It will run but probably not as good. PCM is pretty picky on the ICP working correctly and setting a CEL if it is not.

I have to ask, are you sure you put on over 40K and not just 4K?

 

you got that backwards jim.

If it drives the same, its bad, if it drives worse, its good.

 

What he said.

If you're having surging problems and such, you're probably better off correcting that condition first. Did you check your fuel pressure at the FPR? Clean the screen? If not, do these two items.

Remove the resistors. Make sure you have good connections on the wire. You're using the blue wire with the red tracer, right?

Each truck will respond differently to this mod, but 40K? My truck showed deminishing results (at the rear wheels, on the dyno) at 25K. More info at https://www.ford-trucks.com/forums/7...d-results.html.

Unless you're swapping resistors with the engine running, you might not set a CEL.

 

Jethro had good results with higher resistance. I think he was running 40k. haha.

 

I am kind of under the same impression as cowmilker. I did not notice any difference in performance or running quality and I was almost up to 40.

 

I'm not a rookie here guys.
I know the difference between 40k and 4k.
Also the surge, is just a 'jump' when it first starts.
It wouldn't even bother me, but the kid who owns the truck was worried about it.

I knew could check those two sensors by unplugging them, but I couldn't remember who it should behave.
Thanks for the reminders.

 

Phil,Are you running splits?..

 

Prove me wrong ...

 

OK guys,who is wrong,Talyn or Hussler.
Jim

 

From my experience, it has been , unplugged runs better , sensor is bad ..