The problem I am having is ONLY at wide open throttle. And, its magnafied when my edge/attitude is plugged in and on low boost 5, edge 3.
The truck will kinda cut in and out, NOT the de-fuel cut in and out.
Its kinda like Waaaaa-Uh-Waaaaa-Uh-Waaaaauh-Uh, it does this really fast.

Any ideas what could cause this? The fuel filter is brand new, just incase someone suggests that.

so this is happening with AND without the Edge installed.. I'm thinking FPR since the Edge increases pressure, maybe its going out or you need a lift pump.

no codes at all?? you might have it checked out to be sure

Well I just got the truck back last week from the dealership after being there for 3 weeks. They just replaced my injector harness and glow plug control module. I hope my fuel pressure regulator isn't going now. I will be very pissed if this thing has to sit at the dealership AGAIN for 3weeks. You think they messed up something else when replacing those parts? Could they have damaged the fuel pressure regulator? The truck did NOT act like this before it went into the dealer for previous mentioned repairs. Truck has over 30,000 edge/attitude miles on it(37,000 total mileage). So this is a new problem, not something that was there before.

Edit: Sorry, forgot to add, there are no codes. At least no service engine light. I don't have a handheld scanner to search for codes. So there could be some that aren't tripping service engine light.

The truck did NOT act like this before it went into the dealer for previous mentioned repairs. Truck has over 30,000 edge/attitude miles on it(37,000 total mileage). So this is a new problem, not something that was there before.

oh ok, you never mentioned you had taken it in for anything previously. In that case I'd take it back to them since it seems to be related to those repairs.

Well, I never did take the truck into the dealer YET. Driving to work this morning the SES light finally came on. Went to autozone at lunch to get the codes read. P0181 is the code. According to autozone, it is the fuel temp sensor. How easy is it to change this? Where is it? Could this be causing my WOT surgeing problem?

I thought the Edge does not mess with rail pressure? It only modifies injector pulse-width timing I think... The only box that messes with rail pressure that I know of for sure is the Banks six-gun, and with that it only increases rail PSI on level 6. I could be wrong about the Edge tho. You would really need a Tech 2 hooked up to watch rail pressure. That way you can see if the cutting out is caused by a drop in rail pressure or something else. If the actual rail pressure drops off to more than 1,000 PSI or so BELOW the commanded rail pressure, than its probably a releif valve problem...

Thanks for that info. I'm taking the truck in at 6:30 this evening. So i'll mention to them about checking the rail pressure with a techII. I just got off the phone with the service guy, and he tells me the fuel temp sensor is covered under the 100,000 mile drivetrain warrenty. WHEW!!!:ro) (i'm now at 37,000 miles)



Edit: Its pretty funny actually, the service guy just decided to call me outta the blue cause they took 3 weeks to replace my injector harness, and glow plug module. He was checking to see if my truck was still running good. I laughed and said, actually I was just getting ready to call you. He said, Oh no, now what? I just laughed, and you know the rest. He said he felt bad that I have had so many warranty claims on my truck and am still having all these problems.

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Do a search on the P0181 code. Several people have had the problem including myself. The problem is associated with plugging the truck in at night where the tempurature is higher than 0*F. I'm assuming living in Michigan you have been plugging it in at night with the cooler weather. I have dropped the edge down to level 1 and drive with a light accelerator until the engine is at full operating temperature and have not had a check engine light since.

Thanks RVC, I went back and read your posts on the issue. My symptoms fit yours EXACTLY(even the loss of power)! Its been around 30 degrees here, and i'm using the winter cover and plugging the truck in at night. Now i'm %99.99 sure between the cover, and plugging the truck in every night that this is my problem. My truck is now at the dealership so I'll just wait and see what they say.


Edit: Dangit RVC, I wish you would've posted sooner:) . Could've saved $100.00 deductable:( .

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Not sure what type of relationship you have with your dealer but, when the dealer tells you the problem can't be fixed with a reflash and your not suppose to plug it in until the temperature is 0*F and lower. Explain how plugging it in, is your way of reducing the amount of warranty work required by reducing the number of cold starts.

Having been without your truck for three weeks, your service advisor should waive the deductable on somthing that they don't have a fix for anyway. Or tell them the deductable will be paid when there is a fix. I've been waiting for over a year.

I'm in pretty tight with the service guy. So ya, i'm hoping to skate on the $100 service charge if there isn't a fix. I called and left the service guy a message this morning about the winter cover, and plugging it in under 30 degrees. No call back yet. So now its a waiting game.
Service guy said he doesn't mind when I bring my truck in, cause i'm always prepared (as well as possible) with TSB's and things of the sort. He said I know so much about diesels(Ya right!) that he trusts what ever I tell him. I think he was most impressed first time I had the truck in for injector replacement, and they were on national back order. I called a contact at GM(i work at GM) and had some at the dealer next day:ro) . He was like DANG, you must of talked to the right people.:grd:

Well I don't have that kind of pull but when I tell them I've got a problem. They don't give me the "Cannot duplicate customer complaint" line. Usually the diesel tech comes over to talk whenever he see me, and it's just to find out if I have learned anything more from this web site.

The P0181 was a, we've never heard of that before. Tech just happened to notice the low fuel rail pressure compared to requested psi. History showed a request of 100% APP when the engine had just reached the good operating temperature (180+) which I contribute to the edged box. That along with the differences in the OAT and the IAT because of it being plugged in was causing the check engine light to be set. Since running on level 1 until I have traveled for half an hour before bumping it up, the check engine light has not come on.

Well, service guy just called me. He said GM has NO fix for the P0181 problem right now:( but they are aware of it. He says my truck will be first in line at their dealer when a fix does come in. He told me engineering is collecting data on all trucks producing the P0181 code(whatever the heck that means?).
They also fixed my W.O.T. surging:ro). Told me there was yet ANOTHER re-flash for my truck(2nd one in the last 10,000 miles) thats suppose to fix the surging I was complaining about(we'll see when i get it tomorrow):rolleyes:.

Now the best part, he's only gonna charge me $100 deductable now and keep my case open for the P0181 code. That way I won't have to pay another $100 deductable.:cool2:

Edit: For those wondering, the re-flash is/was $97.00.