Just doing some preliminary homework, I have an EHCU module located directly under the Air Filter. Is this the "ECU" module which the Superchip attaches to? I have read about others locating theirs under the battery. I have nothing there.
Thanks,
Bob

2002 F 150, 4.6L

 

Look on the passenger side just above the kick panel. In the engine compartment just aft of the battery tray you should be able to see the wiring harnes where it is attached to the computer. If you have a 4X4 there maybe some components in the way but there should be enough room to see it.

 

Hi Bob,

As George mentioned, your ECU (which stands for Engine Control Unit, and these days is usually referred to more accurately by dealerships as the "PCM," which stands for the "Powertrain Control Unit"), the powertrain computer, is located on the passenger side of the cabin, just above the passenger's kick panel.

It is a small rectangular-shaped aluminum box, 1.5 inches wide by 6 inches high by 9 inches long, the way it's mounted in these FD-150's. It's mounted to the inner fender panel, just above where the passenger's kick panel ends.

If you have any trouble finding it, just give us a quick call.

 

Mike -
My 4.6 - 97 vintage 4x2 has a box just below the hood hinge - mounted verticle, passanger side. The label reads: IMP4. Should I look any further up in the passanger side of the firewall, or is this what I need to give you to order my SUPERCHIP? Production date: 9/96 - Zerb

 

Hi Zerb,

You've got a very early 1997 model with that September '96 build date, and yes, IMP4 is your computer code, you've found it!

Actually, what you are seeing there under the hood is the wiring harness "hub" where it connects to the front of the PCM right behind the battery. The PCM will actually come out thru the cabin, as you'll see when you get our Performance Products documentation which will go over all of that in detail with you.

Have fun!

 

Chip went in, started instantly. Reset PCM; started again no problem. Ran typical duty cycles to let chip re-establish a baseline, and found the rev limiter still in the program. Not too happy that I found that it still there.

 

Hi Zerb,

Actually the rev limiter will *always* be there, we don't remove rev limiters except in pure race situations, and even then only under a signed waiver. All engines need rev limiters.

Thanks very much for calling so we could go over everything in detail I appreciate your comments, etc.

For others reading these posts, I'll explain a bit.............

What you experienced there with revving it up to high rpms in Neutral or Park like that was simply the no-load rev limiter cutting in just exactly as it's supposed to. The no-load rev limiter is there in most late 80's to early 90's FoMoCo vehicles, to protect the engine against high rpms with no load on the motor. No engine should be wound to high rpms with no load on it like that (drag race & other racing applications excepted). That no load rev limiter is there to protect the motor, and is generally not going to be higher than 4500 rpm, just as you experienced. The no-load rev limiter is in addition to the "absolute" rev limiter, which controls the highest rpms the engine can turn when under a load.

It's a darn good thing the no-load rev limiter is there, as nailing the throttle with no load on it is a great way to spin a bearing, either crankshaft or connecting rod bearing.

Thanks again for calling, & have fun!

 

Related to last post -- on one recent fine summer day, I was cruising on a liesurely drive from here to there on a local hilly stretch. During one downhill stretch, I decided to see just how far up the next hill I could go under power of inertia -- so I simply nudged the shifter into neutral and watched as my speed slowly gained from the cruise controlled speed of 55 up thru 60, thru 65, etc..

Upon reaching the bottom of the hill, I had attained perhaps 65 MPH or so -- and started the ascent.

65, 60, 59, 58, 57, 56, 55 MPH then...

Wham! Engine RPM pegged at two billion RPM!

WTF ! I screamed to myself mentally -- as I watched the tach peg somewhere where I hadn't expected to see it be.

It must have taken me two seconds to realize that I had not turned off the cruise control -- and it was simply trying to keep me at 55 MPH.

It was then that I really developed an appreciation for the rev limiter (and my stupidity).