have 04 ex PSD with 135000 had some stiction issues so put in some hot shot to clean out the gunk... couple nights ago oil temp was up to 142f put on cruise and engine started to Surge about 200-300 rpm.. its done it 3x sine what the heck would cause this.... please dont say check the FICM i have and its ok... clean turbo as well...

 

Could you describe the issue a little more? Just does it one time and goes away or what? Maybe the torque conveter unlocking and locking back up quick? What mods are done to the truck?

 

only upgrades are Banks IQ monitor for gauges and diagnostic codes. Industrial injections Stage 1 turbo SnB intake and Mbrp turbo back 4" straight. Engine temp on surge is 140 degrees highway speeds of about 55-60 mph. surging meaning up down continuous until i intervene by WOT then coast then when starts again gotta go WOT again then coast. after few mins it calms down but still bogs down on inclines.?.? WTH

 

That's odd... I wonder if the turbo itself is surging. RPM is controlled by fuel though... That's odd.

Why the II turbo? Did you just need a stock replacement at some point and decided to put that on? I'd imagine it could be surging without the proper tuning for it. Does your oil temp ever get up above that? Or are you saying it starts once oil temp is up around 140* and continues to do it beyond that? The bogging on inclines could be a few things, and again could be turbo issues, as in not lighting it. What's boost doing when this is happening? Is your IQ monitoring boost?

 

I know there was an issue with surging that was addressed by Ford, don't know if it was a programming thing or what.. Might want to clean the EBP sensor that is either right next to your dipstick or close to the center of the valve cover on drivers side. My truck did this when my ICP was going up, but I always noticed it when at a stoplite and had to make sure I was on the brakes hard so if it did it I didn't plow into the guy in front of me.

 

weak injector? Does it go away when oil temp is at operating temp?

 

It's not a stock turbo though, so it may just be as simple as getting the correct tuning to control that turbo. Cleaning the EBP sensor would be a good idea regardless though, good call. Same for the EBP tube too.

I'm wondering the same thing...

 

yes when oil temp is about 179 it stops... EBP sensor is where ill start.

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what are the standards for the operating pressures for the OIL? Could the HPOP be causing symptoms like this?

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I have been running this same setup for 2 years without incident. It would have shown up sooner i would think if programing issue. " I would Think" but what the heck do i know...

 

Cylinder contribution test, sounds like your having same problem I am. I have a weak injector but I know this because everything else checks out including ICP,IPR,EGR,turbo, etc.

 

I don't see how the HPOP would cause the engine RPM to surge, but it's simple enough to watch those things. You'll need a scanner that is capable of monitoring. You need to watch ICP desired vs. ICP actual, and watch IPR duty cycle too.