I just replaced the tcc solenoid and it worked without issue for about a total of probably 30 miles or so then one of the old issues resurfaced.

When your going at exactly 35 on the speedo you can feel it engage, but it causes the car to surge, like it didn't fully engage, give it a little more gas it'll engage or hit the brake just enough to trigger the stop, then let go and it'll correctly engage.

It only does that at 35, even just going 40 I can feel it engage and it works fine. It has no trouble disengaging and isn't causing the vehicle to stall or dip in rpms when coming to a stop.

Why would it do that?

TCC solenoid replacement? by broderp
https://www.fiero.nl/forum/Forum2/HTML/133268.html

quote lateFormula: I would recommend that you replace the 3rd gear switch while you are in there, as it is part of the TCC circuit.

TCC solenoid installation tips by jetman
https://www.fiero.nl/forum/...050119-2-055302.html

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Original Owner of a Silver '88 GT
Under 'Production Refurbishment' @ 136k Miles

[This message has been edited by Vintage-Nut (edited 11-22-2024).]

So the 3rd gear switch could possibly cause that? The brake is working I know that.

I don't exactly understand what it does.

[This message has been edited by Gizmo0816 (edited 11-22-2024).]