Turbo lag/no low end torque AFTER the turbo failure

The puzzle continues…
My turbo blew out 1/30/13 and I did fill out the survey. Basically, 4.5k miles, winter conditions, pretty common stuff from what I read. The dealer took care of me.
However…
Now that I've got the car back, and put on about 1,000 miles I've noticed that there is almost a 2 second delay when I put my foot on the gas to when the car starts to accelerate PLUS there's very little torque until about 2600 RPM.
This is occasionally combined with excess vibration coming from under the hood, from the engine, around 1400-1600 rpm.
Any of this related to the replaced turbo unit, or do you think this is random and unrelated?
Thanks.
Peter

I'm thinking they didn't do it right and a return trip to the dealership is in order. Sorry about that!

Thanks. I have a service call and will report the results later on this week.
Peter

Hopefully it's something simple. There are some smart folks on this board, maybe it can be diagnosed by someone before your trip to the dealership.

It would be helpful if there was a way to read codes in these cars without a trip to the dealership, in my Dodge truck I can cycle the key three times (without starting) and it will display all codes that are stored. Of course it's a dodge so there are always a few.

Sounds like the VNT isn't working properly and you're not developing boost as soon as you should be.

If the VNT isn't working as designed there should be a CEL, unless they also reprogramed the ECU which isn't likely.

actual boost != to boost demaned will cause a CEL real quick!

Thank you for all of your collective help. The car's at the dealer and they were able to recreate the problem. Once they report back, I'll post the answer for our collective education.
Thanks again one and all.
Peter

740GLE said:

(actual boost) != (to boost demanded) will cause a CEL real quick!

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Is this true? If so, what sort of tolerance is allowed before the CEL appears?

This isn't good. The dealer replaced my turbo. A week later its back in the shop with this turbo lag problem. After investigation, the dealer thinks that its a fuel problem.
The dealer has taken apart the fuel system, looking for loose particles. Its taken 3 days so far and they still haven't returned the car.
I hope others who have had their turbos replaced didn't have this problem...

Sounds like the scattergun approach to me.

They should be able to narrow it down by monitoring their scan tool on a test drive.

wackypete said:

Is this true? If so, what sort of tolerance is allowed before the CEL appears?

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not sure, a PSI or two i'm guessing.

Well…this is bad. Turns out, the problem was NOT related to the turbo. Turns out I had a bad "fuel rail pressure regulator."
Which they replaced.
This begs the question - I've had two major mechanical problems (turbo and fuel rail) in less than 6k miles.
Do I have a lemon here?

Sorry for your trouble, but I sure wouldn't call a regulator a major mechanical issue.

The turbo issue should easily be resolved. I'm not worried about that long term. It seems they have identified the problem and are replacing with an improved turbo.

mafrif said:

Sorry for your trouble, but I sure wouldn't call a regulator a major mechanical issue.
The turbo issue should easily be resolved. I'm not worried about that long term. It seems they have identified the problem and are replacing with an improved turbo.

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OK…I'm panicking…I admit . Cooler heads will prevail.

I wouldn't call it a lemon just yet.

jetpuck said:

OK…I'm panicking…I admit . Cooler heads will prevail.

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I can understand your concern. I would suggest documenting everything. Keep notes on how many days it's in the shop, who you talked to and the outcome of all visits. We tend to forget these details after time. I wish you luck with your car, please keep the group advised.

An remember, document, document, document!