Lately my truck with its powermax turbo has been acting up a little. It runs great most of the time but sometimes when I first get on the highway I will need to let off the gas to merge with traffic. Then when I got back on the gas it will not build any boost (2-5psi ) and smokes like a freight train.
Is this the sign of a bad VGT solenoid ?

Thanks.

 

It could very well be and I know VGTs are high doller ,I would look at the EBP senser and tube first. do you have any gauges to monitor? vgt should be
koeo=0
lo=73
hi=43
Then clean the IAT2 senser
MAP ,BARO,EBP should be within 5psi of each other, If not could be EBP, have some one Tap on the senser and you watch the gauge.

 

Thanks badford I will check those.

 

i doubt its the vgt, since the problems with them are scarce, id be looking to disassemble the turbo and see how seized it is, check unison ring for any damage from the actuator arm.

 

I had a similar issue and doing the turbo relearning procedure solved the problem.

 

How is that done ?

 

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.




You don't have to short out the battery cable as listed in step 5. Just disconnect the batteries and turn on you headlights for about 5-10 minutes. That will clear the KAM.

It's important to make sure the truck is up to operating temps and NO codes.

 

Andy ,I was Brousing and ran across this , thought you my like to read. go to tech folders =Ford Tech Manuals pdf= under tech turbo guide for 6.0 by Maxmum 4x4. it has info on the VGT and test process that may be easyer to read your selve rather than trying to decifer my typeing lol. good luck