Sudden drop of power.

[SASHO91]

This has recently started, and seems as if it's getting progressivly worse. Allthough, I think it may be due to the road conditions.
Let me run you by the scenario....
Driving along at 45mph or so. Constant engine speed, constant throttle, and all of a sudden the engine drops power and at the same time I get a quick flash from the CEL. This all happens within half a second. As quick as it hit, I get power back almost instantly.
From what I have noticed though, is that it normally only happens when I hit a rough patch of road, or the like. And I can't recall it ever happening at higher speeds (above 50ish). It has also done it at idle as well, but only a couple times.

So, when I got home tonight, I popped the hood and started checking connections and what not... MAF, TPS, CPS, Coil Pack, etc... The only one that felt loose was the MAF connector. But even with the hardest jolt, it would not repeat the symptoms. My only other guess would be the CCRM. Maybe it's dropping power to EEC for some reason for a spit second...

I have yet to pull codes, but I don't think there is going to be anything in there to help me.

Another thing, right after this happens, the car runs rich for a few seconds (probably 5 or so). Even off throttle the car is still running rich. Which kinda backs up my CCRM thought. The EEC looses power, then when it comes back on, it goes to a "start-up" tune, or something along those lines.

Yet another day in the SHO world. :angelnot:

 

[gas it]

Do you mean loosing electrical power? Did you check the ground wire at the starter bolt? What about the ground strap at the back of the intake? Bad ignition switch? Bang on the bottom of the steering column with it running. Bang on the CCRM. Shake, pull, tug on the wire hareness in the engine compartment. Ford calls it "the wiggle test."

Codes will be 545 for sure, then knows what else.

 

[K-Dawg]

There should be a code if the light comes on.

 

[Mr Anonymous]

Sounds like a power failure to the PCM, which could be as simple as a loose power/ground cable somewhere, a failing CCRM, or something worse like a short or open in the harness somewhere.

I'd start with the easy things. With the car idling, start wiggling cables and banging on the CCRM to see if you can duplicate the condition.

 

[itwonder]

I would check for DIS losing SPOUT signal from PCM. You can monitor while driving by rigging a LED test light.

 

[SASHO91]

Sounds like a power failure to the PCM, which could be as simple as a loose power/ground cable somewhere, a failing CCRM, or something worse like a short or open in the harness somewhere.

I'd start with the easy things. With the car idling, start wiggling cables and banging on the CCRM to see if you can duplicate the condition.

Ding Ding Ding!!
I was leaving yesterday morning to go run, and the car started acting up again... so I started checking everything once again....
The only wire/connection I didn't check was the ground wire from the PCM. I was leaning over the motor while it was running to check the connection for the PCM, and hit the ground wire.... car died, and I said "well, shit.... that figures!"

I figured it was a loss of PCM power from the get-go... just didn't think about the ground side.