4l60e won't down shift - The 1947 - Present Chevrolet & GMC Truck Message Board Network

miked440 · 11-08-2012, 10:41 AM

I just typed an entire description and damn iPad for some lost it, so $&!?&$??

I have read 100 post about this but I'm sure there's is a guru that can help
I have replaced all 4 solenoids. 1-2, 2-3, and other front 2. I haven't replanced the converted lock out yet and don't think I need to. I can shift manually between 2-3 but no 1st or OD. I'm getting codes of cylinder 4 misfire, random misfires, and shift solenoid 1-2.
Tps switch??? I'm gonna check next. Please input ideas. I can monitor timing advance etc etc. I know there was a motor swap, so I was told. And vin coming up on scanner doesn't match truck badge. Seems to run fine and no slipping. Pan, filter, and tranny oil all look and smell good. I'm really leaning to electrical?..
Help!?
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scotts62 · 11-10-2012, 05:09 PM

What year and specifics on the truck?? Yes could be electrical.

miked440 · 11-11-2012, 12:37 PM

It's a 98 Chevy z71 , supposedly engine out of 98 GMC Yukon. The more I read it seems to be PCM (ECM) issues VIN don't match etc...
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scotts62 · 11-11-2012, 12:46 PM

Id check the harness going to the trans, maybe wires go pinched with the engine swap.

scotts62 · 11-11-2012, 12:52 PM

This may or may not help, if you need a schematic let me know.

miked440 · 11-11-2012, 12:54 PM

It works and runs fine with codes cleared, till it hits overdrive. A few seconds its fine the drops to 3 rd and throws code. While driving I can clear again and it shifts back to OD ... Few seconds it codes and drops to 3rd. At very low spread or idle its fine
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miked440 · 11-11-2012, 12:57 PM

Yea that is helpful I'd like to have a whole wiring schematic.
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scotts62 · 11-11-2012, 12:57 PM

Had one that was doing something similar and it was the O ring on the lock up solenoid letting pressure by.

scotts62 · 11-11-2012, 12:57 PM

Quote:

Originally Posted by miked440

Yea that is helpful I'd like to have a whole wiring schematic.
Posted via Mobile Device

For the trans or truck?

miked440 · 11-11-2012, 01:03 PM

Haha hell I'd like whole truck and tranny , I hate to drop pan again I have already don't it twice!! Ugh....
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11-08-2012, 10:41 AM	#1
miked440 Registered User Join Date: Jan 2011 Location: irmo sc Posts: 17	4l60e won't down shift I just typed an entire description and damn iPad for some lost it, so $&!?&$?? I have read 100 post about this but I'm sure there's is a guru that can help I have replaced all 4 solenoids. 1-2, 2-3, and other front 2. I haven't replanced the converted lock out yet and don't think I need to. I can shift manually between 2-3 but no 1st or OD. I'm getting codes of cylinder 4 misfire, random misfires, and shift solenoid 1-2. Tps switch??? I'm gonna check next. Please input ideas. I can monitor timing advance etc etc. I know there was a motor swap, so I was told. And vin coming up on scanner doesn't match truck badge. Seems to run fine and no slipping. Pan, filter, and tranny oil all look and smell good. I'm really leaning to electrical?.. Help!? Posted via Mobile Device

11-10-2012, 05:09 PM	#2
scotts62 One day... Join Date: Apr 2008 Location: Tuttle, Ok Posts: 9,243	Re: 4l60e won't down shift What year and specifics on the truck?? Yes could be electrical. __________________ Scott 93 crew cab build Project 62

11-11-2012, 12:37 PM	#3
miked440 Registered User Join Date: Jan 2011 Location: irmo sc Posts: 17	Re: 4l60e won't down shift It's a 98 Chevy z71 , supposedly engine out of 98 GMC Yukon. The more I read it seems to be PCM (ECM) issues VIN don't match etc... Posted via Mobile Device

11-11-2012, 12:46 PM	#4
scotts62 One day... Join Date: Apr 2008 Location: Tuttle, Ok Posts: 9,243	Re: 4l60e won't down shift Id check the harness going to the trans, maybe wires go pinched with the engine swap. __________________ Scott 93 crew cab build Project 62

11-11-2012, 12:52 PM	#5
scotts62 One day... Join Date: Apr 2008 Location: Tuttle, Ok Posts: 9,243	Re: 4l60e won't down shift This may or may not help, if you need a schematic let me know. __________________ Scott 93 crew cab build Project 62

11-11-2012, 12:54 PM	#6
miked440 Registered User Join Date: Jan 2011 Location: irmo sc Posts: 17	Re: 4l60e won't down shift It works and runs fine with codes cleared, till it hits overdrive. A few seconds its fine the drops to 3 rd and throws code. While driving I can clear again and it shifts back to OD ... Few seconds it codes and drops to 3rd. At very low spread or idle its fine Posted via Mobile Device

11-11-2012, 12:57 PM	#7
miked440 Registered User Join Date: Jan 2011 Location: irmo sc Posts: 17	Re: 4l60e won't down shift Yea that is helpful I'd like to have a whole wiring schematic. Posted via Mobile Device

11-11-2012, 12:57 PM	#8
scotts62 One day... Join Date: Apr 2008 Location: Tuttle, Ok Posts: 9,243	Re: 4l60e won't down shift Had one that was doing something similar and it was the O ring on the lock up solenoid letting pressure by. __________________ Scott 93 crew cab build Project 62

11-11-2012, 01:03 PM	#10
miked440 Registered User Join Date: Jan 2011 Location: irmo sc Posts: 17	Re: 4l60e won't down shift Haha hell I'd like whole truck and tranny , I hate to drop pan again I have already don't it twice!! Ugh.... Posted via Mobile Device



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