Wot won’t shift from 1st to 2nd
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Teching In
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Wot won’t shift from 1st to 2nd Hey there, I have an 01 z28 that I’m needing a little guru help with. It has a lq4 or lq9 (I didn’t do the swap and I haven’t checked the piston top yet.) 6.0 swap with the car’s original 4l60e.
the issue I’m having, from a dig at wot it doesn’t want to shift into second. Driving normally, the car shifts fine, but I’m really wanting to take it to the track and see what it does. It will only shift after I let out and the rpm’s get down to about 3500. What could be causing this. I have 60e that I was going to have rebuilt but if it’s something like a sensor or solenoid, I’d rather go that route for now.
thanks-
the issue I’m having, from a dig at wot it doesn’t want to shift into second. Driving normally, the car shifts fine, but I’m really wanting to take it to the track and see what it does. It will only shift after I let out and the rpm’s get down to about 3500. What could be causing this. I have 60e that I was going to have rebuilt but if it’s something like a sensor or solenoid, I’d rather go that route for now.
thanks-
Thread Starter
Teching In
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UPDATE:
So after further self diagnosis, it’s not shifting into 2nd. When I let off it shifts into third but it seems to act like it downshifts from third to second once I get back in it. Could it possibly be a 1–2 shift solenoid going out? I may be wrong but I believe it has 3 solenoids 1-2, 3-4, and a 3-2 or is it just 2 with the 1-2 and the 3-4 on the some one? Also, now it’s not shifting from first to what I just found out to be third unless I let off the throttle regardless of rpm, but it has to be above 2600-2800 to leave 1st.
So after further self diagnosis, it’s not shifting into 2nd. When I let off it shifts into third but it seems to act like it downshifts from third to second once I get back in it. Could it possibly be a 1–2 shift solenoid going out? I may be wrong but I believe it has 3 solenoids 1-2, 3-4, and a 3-2 or is it just 2 with the 1-2 and the 3-4 on the some one? Also, now it’s not shifting from first to what I just found out to be third unless I let off the throttle regardless of rpm, but it has to be above 2600-2800 to leave 1st.
Thread Starter
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TECH Senior Member
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From: Central Cal.
I'm wondering if whatever it's reading for RPM is messed up. Sounds like it has no idea when to shift.
The fact that it DOES shift and runs in the various gears indicates the mechanicals are healthy.
Something's out of calibration somewhere.
The fact that it DOES shift and runs in the various gears indicates the mechanicals are healthy.
Something's out of calibration somewhere.
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Thread Starter
Teching In
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That’s why I was wondering if it could be a solenoid or something along those lines. I did see that the vss and the tps could make it do something similar but the thing that is getting me if the fact I have to lift off the gas in order for it to shift. And once again, that’s only from first gear.
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Teching In
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but wouldn’t that that be the 2-4 band? I still have forth. And it will downshift from 3rd to 2nd after the initial shift from 1st to 3rd
Launching!
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From: AZ
ok further reading ....the servo pin MIGHT fix it ....although a band aide, I still think the band is fucked up causing the issue. You can still have 4th/no second, with a fucked up band
you can get a longer servo pin to patch it up, seems like many have succeeded this way
however i would start saving money for a new trans
you can get a longer servo pin to patch it up, seems like many have succeeded this way
however i would start saving money for a new trans
Thread Starter
Teching In
Joined: Jul 2023
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ok further reading ....the servo pin MIGHT fix it ....although a band aide, I still think the band is fucked up causing the issue. You can still have 4th/no second, with a fucked up band
you can get a longer servo pin to patch it up, seems like many have succeeded this way
however i would start saving money for a new trans
you can get a longer servo pin to patch it up, seems like many have succeeded this way
however i would start saving money for a new trans
Thread Starter
Teching In
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So this morning I got to messing around with it and even though there was no check engine light, just for ***** and giggles, I put a code reader on it. Pulled a p0752 code, solenoid a stuck on. So I’ll probably start with swapping the solenoid and I’ll update shortly.
Launching!
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From: AZ
- Low transmission fluid level
- Dirty transmission fluid
- Faulty Control Solenoid Valve Assembly
- Control Solenoid Valve Assembly harness or connectors
- Control Solenoid Valve Assembly circuit is open or shorted
Thread Starter
Teching In
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yeah, I’m gonna swap the solenoid, filter and fluid this weekend. Hopefully that does the trick.
Well if you are going to dig into it, pull the VSS out. It's probably damaged as well. Once the bushings start wearing, the tone wheel makes contact with the VSS. I'm going to guess, you'll find the surface of it has some kind of damage as well, which makes it more difficult for it to read at higher rpm, thus causing shifting issues as well. Once the avalanche starts, it's hard to stop.
I always start with the easy stuff first, try removing the VSS to inspect it, then if you see nothing change it,test drive the car and move forward. That way you're not throwing a bunch of parts and spending a lot of money and not really knowing what part fixed it. It's a process of elimination.
Thread Starter
Teching In
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So I switched the fluid, tcc, 3-2, and both shift solenoids, along with the filter. Still nothing changed, checked fuses under the hood that go to the trans, it was blown, swapped it, and still nothing.
