[4cstr]

Ok...we took the camper out for our first outing this past Memorial Day weekend. It was also the first pull with my DI chip. We drove into a steady 20-25 mph headwind. Coming out of little creek valley my truck downshifted, EGT's skyrocketed and my SES light lit off. These are the codes that were left:

P1211......ICP not controllable, pressure above/below desired.
P1249......Wastegate fail steady state test
P1282......Excessive ICP

I'm guessing that the ICP errors are from my chip. What about the wastegate message? Is that an overboost indicator or a possible backpressure sensor problem?

I'm having Dave tone down my tow program to help keep EGT's in check while towing...but I would like to narrow down this P1249 code. On the trip back I shut the chip off(stock position), set the cruise at 65 mph...and had no issues what so ever. The truck ran perfectly and only downshifted once.

I'm really not in the mood to have to change out my turbo, or the wastegage solenoid and hoping that its just overboost. My boost guage at the time was showing 25 pounds and I thought the overboost error code set at 27 pounds. I also admit that a 1-2 pound error in my readings is not out of the question.

Anyway...all youze smart fellas please give me your opinions.

Thanks
Dave

 

[Ford_Forgotton]

the P1249 indicates "GND short, plugged hose/port, solenoid, actuator" from what google can find.

Also some indication that maybe the factory MAP sensor is defective, but overall prolly just an over-boost light.

You were prolly pushing greater than 20psi of boost for a really long time and the computer decided you were too high for too long, therefore the wastegate must be broken.

25psi is usually the overboost limit, but the factory design is only 15psi, and thats what the fuel map is designed around.

 

[4cstr]

Thanks Daryl... When you say [ QUOTE ]
25psi is usually the overboost limit, but the factory design is only 15psi, and thats what the fuel map is designed around.

[/ QUOTE ] what do you mean by the factory design is only 15psi?

How much longer you in New Orleans? You gonna travel up to SoDak on your trip back?

Dave

 

[Ford_Forgotton]

With factory programming, factory intake/exhaust, etc etc. The computer expects around 15-17psi at the max. Garret engineers built in a 10psi safety so the turbo can safely handle up to 25psi.

However, its my understanding that the fuel map in the computer is designed around 15psi max boost. Meaning once the computer detects 15psi, its dumping in all the fuel its gonna dump. Any boost over 15 is just extra air (lower EGTs usually).

The computer is designed to detect extended boosts levels that are over its "normal" range and report back as a potentially stuck EBPV, or faulty EBPV actuator.

Its also designed to cut back fuel if it sees anything higher than 25psi. Hence the "overboost eliminator" kits sold by the vendors.

The overboost eliminators of course allow you to run at 25psi or higher without setting a code. You risk the chance of burning out your turbo tho if you run over 25psi. Thrust bearing cant handle the load, and its also out of the efficiency range of the compressor wheel.

If you have an aftemarket turbo, then the overboost eliminator is NEEDED. However most vendors sell the overboost kit to stock turbo users, but dont bother to inform them that they're killing their stock turbo. Anything to make a buck.

31 more days left in the #[email protected]#hole city. Im coming back home via yellowstone and Idaho so the wife can see the geysers, and I can catch the dunes at St Anthonys.