Odd Hesitation
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Joined: Sep 2008
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Odd Hesitation
My '05 PSD has developed an odd hesitation that only occurs under the following conditions:
Engine has sat for awhile
Engine has just been started
Just shifted from reverse to drive
typical scenario is I start the truck up in the morning and shift into reverse and back out of the driveway normally. The engine responds fine while I'm sitting there in park or while I'm backing out. Then I stop, shift into drive and press the accelerator but nothing happens for about half a second. I do mean nothing, no increase in RPM or engine noise and no acceleration. It doesn't matter how hard or soft I press the throttle for about half a sec. nothing happens. Then suddenly the engine responds normally until I shut it down for several hours and repeat the process.
It does this whether it's cold out or not. Any ideas?
Engine has sat for awhile
Engine has just been started
Just shifted from reverse to drive
typical scenario is I start the truck up in the morning and shift into reverse and back out of the driveway normally. The engine responds fine while I'm sitting there in park or while I'm backing out. Then I stop, shift into drive and press the accelerator but nothing happens for about half a second. I do mean nothing, no increase in RPM or engine noise and no acceleration. It doesn't matter how hard or soft I press the throttle for about half a sec. nothing happens. Then suddenly the engine responds normally until I shut it down for several hours and repeat the process.
It does this whether it's cold out or not. Any ideas?
Cargo Master
Joined: Mar 2007
Posts: 3,103
Likes: 32
From: AB/BC
I have been doing a lot of torqshift reading lately and found this a couple days ago.
Harsh or Delayed Forward or Reverse Engagement:
This could be caused by a sticking line pressure control (PC-A) solenoid. Typically the line pressure will be fluctuatiing wildly (up to 500 PSI!). To service, replace the line pressure control solenoid with P/N 4C3Z-7G383-AA. Broadcast Message 1586
This repair will require removing the solenoid harness, so a new harness sealing o-ring will need to be installed. In some cases the solenoid body will need to be removed from the trans to remove the harness and solenoid. In this case the solenoid body gasket will be needed as well. Note: Do not loosen the 10mm head bolts on the solenoid body. Only loosen the 8mm head bolts.
Harsh or Delayed Forward or Reverse Engagement:
This could be caused by a sticking line pressure control (PC-A) solenoid. Typically the line pressure will be fluctuatiing wildly (up to 500 PSI!). To service, replace the line pressure control solenoid with P/N 4C3Z-7G383-AA. Broadcast Message 1586
This repair will require removing the solenoid harness, so a new harness sealing o-ring will need to be installed. In some cases the solenoid body will need to be removed from the trans to remove the harness and solenoid. In this case the solenoid body gasket will be needed as well. Note: Do not loosen the 10mm head bolts on the solenoid body. Only loosen the 8mm head bolts.
