Question about 1980 Chevrolet Corvette

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Not sure where to hook up the vacuum for the lockup torque converter switch on my 1980 corvette

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The vacum line connects to a unported port

Posted on Sep 25, 2009

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1 Answer

Torque converter lock up problems with 350c transmission


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Where is wiring for torque converter located


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2004 Dodge 3500 4x4 , torque converter lock up problems


The bad ground answer seems to be the most plausible answer. I had the same problem with my diesel 48RE transmission.

I remembered a condition with the Intrepid where the instrument cluster lights and dome light would go nuts. The solution was to pull the plug from the back of the cluster dimmer control and apply electrolytic grease.

I applied some to my Transmission Range Sensor connector and haven't had any trouble since.

1. Diesels don't use vacuum
2. Fluid level won't affect TC lockup
3. Replaced the TC lockup solenoid array which did not alleviate the condition.

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Does anybody know how to fix a torque converter in a TH350. When I runnin down the road at 55 mph the motor whines at about 3500 rpm. The torque converter never kicks in. Anybody know how to fix it. Please...


The lockup converter will only drop the engine speed about
500 rpm.Sure it gets to 3 rd gear?
If there is no lockup ,could be brake lite switch,lockup solonid,
ECM,or the converter itself.

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I have a 1980 corvette and no power to the blower fan switch?


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Link: diagram

Hop this helps.

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O/D flashing 2000 Ford ranger xlt 4.0 4x4


ask if it has a tcc, or or maybe it's a tss
which is a torque convertor lockup switch
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2 Answers

1980 corvette


This car does not have a door lock relay. The gray and tan wires go straight from the switch to the door lock motors.

Dec 04, 2008 | 1980 Chevrolet Corvette

1 Answer

87 honda accord


Probably a bad torque converter lock up solenoid...

Try starting it in neutral, and putting it in drive without your foot on the brake (I know the car will take off in quite a hurry if it doesn't stall but it's an easy way to check for this)

If it doesn't stall, apply the brakes, and if it stalls then, it definitely is a bad lockup.

I don't know if you're familiar with the torque converter function/operation, but where it is a fluid (liquid) and not solid coupling with the engine, lockup is used at certain road speeds/engine RPMs to get rid of the power loss that always occurs between the pump and the turbine of the torque converter. It mechanically (through transmission oil pressure) locks both parts of the converter together so it then acts like the engine crankshaft is bolted right to the input shaft of the automatic transmission.

But, as you might imagine, this system has to unlock the converter when you apply the brakes for the same reason applying brakes without the clutch on a manual transmission stalls the engine.

Bad lockup solenoid will cause this to happen... The converter stays in lockup and as soon as you try to stop the vehicle, you also stop (stall) the engine.

It also might be something else but I'd say I'm about 90% sure on this one.

Aug 20, 2008 | 1987 Honda Accord

1 Answer

Stalls when put into gear


Its possible it could be other things causing the problem, but seeing as you've checked most of the likely causes, it is most likely your Torque-Converter. The lockup clutch in your Stator-Fan located inside the Torque-Converter could be siezed, causing the car to stall.

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