AT VDC issue

tomred · 06-13-2023, 03:13 AM

Hi all,
I have a 10yr old 370 with 100k miles.
Recently the car has developed a fault with the transmission (AT).
When I start car all is fine for first 5-10mins then there is a little rev down blip and service light and VDC light come on. After this gear shifts down are fine but up is very clunky, in both D and Manual.
Next day same thing.
I thought there must be a temp issue as it only happens after 5-10mins but now I found that after 20mins driving I stopped, switched off car then on and the VDC fault went and car drove fine for 40mins.
After first time, fault service light stays on always, but I assume this is because there is a fault to be cleared.
After first visit to garage the fault was Cam angle sensor, replaced.
Drove fine for return journey, but next time fault returns.
Back at garage and again CAS is fault again. They are investigating if there is a wiring fault.

Anybody experience anything like this before?

Thanks all.

tomred · 06-14-2023, 06:12 AM

ok, so they took out the solenoids that divert oil to the cam phasers that advance the cams, apparently they have a little oil mesh and they suspect they need cleaning.
Back in the car and after a 20min journey all was well.
Hopefully when I pick up the car this will be the solution.

tomred · 06-16-2023, 02:52 AM

So in case this happens to anyone else, cleaning the solenoids would seem to have resolved the issue, 2 days of fault free motoring.

Tractionless · 06-17-2023, 06:55 PM

Where are these solenoids located?

phunk · 07-03-2023, 07:12 PM

Thanks for sharing your experience. Now that these cars are starting to age, its interesting to see where the quirks develop.

phunk · 07-03-2023, 07:18 PM

Quote:

Originally Posted by Tractionless

Where are these solenoids located?

On the VTC covers roughly opposite to the cam angle sensors.

Tractionless · 07-08-2023, 02:19 PM

Quote:

Originally Posted by phunk

On the VTC covers roughly opposite to the cam angle sensors.

Thanks, was able to pull my driver side out enough to see the screen was completely clear. Not bad for 13 yrs. and 100k mi.

SG4247 · 07-08-2023, 02:32 PM

Quote:

Originally Posted by Tractionless

Thanks, was able to pull my driver side out enough to see the screen was completely clear. Not bad for 13 yrs. and 100k mi.

Yep - change the oil correctly, keep the oil clean and it will last a long *** time.

There are also screens on the deck of the heads and on the timing cover.

The cam chain tensioners have screens too.

Mine were all spotless, but I cleaned them with compressed air anyway.

06-13-2023, 03:13 AM	#1 (permalink)
tomred Base Member Join Date: Apr 2017 Location: Dubai Posts: 24 Drives: 2013 370Z Roadster Rep Power: 8	AT VDC issue Hi all, I have a 10yr old 370 with 100k miles. Recently the car has developed a fault with the transmission (AT). When I start car all is fine for first 5-10mins then there is a little rev down blip and service light and VDC light come on. After this gear shifts down are fine but up is very clunky, in both D and Manual. Next day same thing. I thought there must be a temp issue as it only happens after 5-10mins but now I found that after 20mins driving I stopped, switched off car then on and the VDC fault went and car drove fine for 40mins. After first time, fault service light stays on always, but I assume this is because there is a fault to be cleared. After first visit to garage the fault was Cam angle sensor, replaced. Drove fine for return journey, but next time fault returns. Back at garage and again CAS is fault again. They are investigating if there is a wiring fault. Anybody experience anything like this before? Thanks all.

06-14-2023, 06:12 AM	#2 (permalink)
tomred Base Member Join Date: Apr 2017 Location: Dubai Posts: 24 Drives: 2013 370Z Roadster Rep Power: 8	ok, so they took out the solenoids that divert oil to the cam phasers that advance the cams, apparently they have a little oil mesh and they suspect they need cleaning. Back in the car and after a 20min journey all was well. Hopefully when I pick up the car this will be the solution. JARblue and Memphis370Z like this.

06-16-2023, 02:52 AM	#3 (permalink)
tomred Base Member Join Date: Apr 2017 Location: Dubai Posts: 24 Drives: 2013 370Z Roadster Rep Power: 8	So in case this happens to anyone else, cleaning the solenoids would seem to have resolved the issue, 2 days of fault free motoring. phunk, JARblue, Rusty and 2 others like this.

06-17-2023, 06:55 PM	#4 (permalink)
Tractionless A True Z Fanatic Join Date: Jan 2016 Location: Atlantic SE Posts: 1,326 Drives: '10 K23 ST 7AT Rep Power: 30525	Where are these solenoids located? __________________ Toys Not Tots

07-03-2023, 07:12 PM	#5 (permalink)
phunk A True Z Fanatic Join Date: Mar 2009 Location: Chicago Posts: 3,668 Drives: 370 Rep Power: 974723	Thanks for sharing your experience. Now that these cars are starting to age, its interesting to see where the quirks develop. __________________ Charles @ CJ Motorsports : Website \| Facebook \| Instagram \| YouTube Home of the 9 second, stock longblock, stock drivetrain 6MT 370z. 9.91 @ 142mph

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