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Old 02-21-2012, 01:27 PM
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EGR delete = power loss?

So, I just had the oil cooler replaced and EGR delete kit installed last week and did some towing on Sunday only to find that I've now lost some power. I've read pretty much every thread on here on the subject and most pertain to low boost which isn't my issue. With 2000lbs less load it was running 8-10psi more boost to hold the same speed on the same sections of road. Previously, with a combined total weight of 17K, I could hold 12-15psi to maintain 70mph. Now, with only 15K, I was running 20-25psi to hold 70mph. WTF? EGTs are fine around 900* cruising at 15psi and 1100* when around 25psi. No funky noises and no white smoke or puking. EGR is still connected to the harness as I've heard the 03/04 trucks need that or the turbo vanes won't cycle. Does the computer need to do a re-learn after having the batteries disconnected and EGR removed? Batteries are also brand new BXT65-850 done at the same time as the other work. Looking for suggestions from anyone who has experienced the same thing. Thanks.
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Old 02-21-2012, 01:43 PM
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First be sure that all sensor are seated and have a solid connection. There also me be a chance that the vanes are sticking.

You can also try the VGT relearn for the '03-'04 trucks. Sometimes when the batteries are disconnected for a prolong period of time, you'll need to to the VGT relearn.

KAM (keep-alive-memory) reset & VGT learn procedure
1. Drive the truck until the engine and transmission have reached normal operating temperature.
(The VGT learn procedure requires that the oil and coolant temperatures be at normal operating temperature)
2. Flash truck back to stock (Only need to do this if running a tuner or module)
3. Turn on the headlights
4. Disconnect both batteries
5. Short out + to - battery cables to each other (Make sure both batteries are disconnected before doing this).
6. Let truck sit like this for 10-minutes
7. Turn off the headlights.
8. Re-connect batteries
9. Cycle the key to the run position twice. Pause in the “ON” position each time until the wait to start lamp goes out (minimum 5-seconds) and pause in the “OFF” position each time for 10-seconds to be sure the PCM has "gone to sleep".
10. Start the truck and let it idle for a minimum of 5-minutes at normal operating temperature. This allows the PCM to learn the EGR valve closed position value. Also you will likely hear the turbo pitch change several times during this period as the PCM learns the necessary duty cycles for accurate VGT control.
11. Complete the road test Drive Cycle:

15 miles of mixed driving (*should* be enough in most cases) to allow the PCM to "re-learn"
its adaptive strategy. Note: Anytime the batteries are disconnected, the PCM will throw the
P1000 code until the “Drive Cycle” is completed. As for the Tow/Haul mode, the transmission
must re-learn your driving style and loads hauled again as this was cleared when the truck was
re-flashed.
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Old 02-21-2012, 02:24 PM
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Thanks Lilpooh. I guess I sort of did part of the procedure. Before I came back from my wheeling trip, I returned the truck to stock just in case something had gotten screwed up in my tow tune from having the computer reset. I re-tuned it back to tow and had to take a different route home due to a crazy blizzard so it was hard to tell if it made any difference. I did notice that it didn't seem to need as much boost to maintain speed, but again, different road and conditions all together. I'll see how it drives over the next few days before I chase my tail any further.
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