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2004 Escalade
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18 Posts
Discussion Starter · #1 ·
Recently purchased an '02 Deville DTS. So far, very happy with the car. One thing that did come up was the Crank Sensor and after lurking around here a little bit, that seems to be a common problem. SO, I had the dealership replace it as part of the purchase agreement. I had about 2 weeks to drive the car before they could get it in to replace it. Gas mileage seemed to average about 25-26 highway....not too bad.
Now that the sensor has been replaced, mileage has dropped to 19 to 21 average. I found a buddy with the Snap-on programmer and had him do the Crank position learn, assuming the dealership had not done, or forgotton to do it....didnt seem to help, mileage has remained low.
So, the question is, what else could have changed? Is there something else that needs to be done, changed, reprogrammed? Anything? Any help would be greatly appreciated!
 

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2004 Escalade
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18 Posts
Discussion Starter · #3 ·
No new codes, thought to look at that too. Car seems to accelerate just like it did before, if not a little better.

Driving style hasn't changed. The milage I'm looking at is with the cruise set on the interstate. Even around town though, it at least seems worse. I am watching the instant mpg read-out on the dash. Accelerating from a stoplight I am seeing 4 or 5 instant mpg, where before it was 8 or 9.

Just puttering around town, I am seeing 14 or 15, before it was around 18 or 19.

Can the crank position learn be done inaccuratly? The scan tool said it was completed successfully.
 

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2004 Escalade
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18 Posts
Discussion Starter · #5 ·
Also, another thought. I notice this right away after leaving the dealership. But of course, I picked it up afterhours and its 90 miles from my home. I just assumed the crank learn had not been done and would do it on my own time.

But now that its done, I think they may have done it anyway and the problem is associated with something else, or the crank learn not being done correctly. I did follow the Snap On instructions that I found online for doing the learn and the tool said it was successful...
 

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Registered
2004 Escalade
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18 Posts
Discussion Starter · #8 ·
Nothing really for codes, no PCm codes, nothing in the history. Cleared them all anyway.

Also, pulled negative battery cable off the battery for an hour last night and let the PCM re-learn.

Check the FPR, doesnt appear to be anything leaking. Pulled the vaccum line and there is plenty of suction there.

Still having the same problem. Really crappy gas mileage....

Any more suggestions?
 
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