TCS valve on firewall of 92 9000 T?

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Charles - 18 Dec 2005 23:19 GMT

I have found the TCS valve on the firewall. It is connected to the
intake via a check valve. Check valve does not allow air to blow out
from the intake but it does allow air to go in, albeit slowly. I checked
by blowing and sucking. On sucking air out of the intake (towards the
valve), it held the vacuum. I could blow air into the intake but not
very well. Is this normal or could the check valve be bad?

What does this valve do?

The one on the firewall looks similar, mounting is slightly different,
but I can swap them temporarily to test. Does anyone know what that
valve does?

It has been in the low to mid teens here lately for high temp (F) and
will warm up this week. I will fool with it when it is a bit warmer.

Thanks for any help,

Charles

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Dexter J - 19 Dec 2005 02:06 GMT

Salutations:

> I have found the TCS valve on the firewall. It is connected to the
> intake via a check valve. Check valve does not allow air to blow out
[quoted text clipped - 15 lines]
>
> Charles

You are on the right track - try replacing the check valve first, it sounds a bit gummy. Do the one on the manifold while you are at it.

Basically - the TCS valve is reading manifold vacuum and pressure to get feedback on it's decisions regarding firing. If there is any kind of blockage or problem in the air-reading - it triggers and error until shutdown and restart - when it check again and, finding all to be within range, resets.

Find another mechanic who doesn't view the part as swapable. The Tech II read out is actually not always correct in that it doesn't have a way to check if the readings the sensors are providing are faulty. It simply fails the system - and provides procedure for replacing all the parts until it gets a correct reading.

In short - it assumes that all the mechanical and electrical connecting systems have already been confirmed as being operating withing the correct ranges.

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Charles - 21 Dec 2005 00:22 GMT

> Salutations:
>
[quoted text clipped - 4 lines]
> > valve), it held the vacuum. I could blow air into the intake but not
> > very well. Is this normal or could the check valve be bad?

> You are on the right track - try replacing the check valve first, it
> sounds a bit gummy. Do the one on the manifold while you are at it.

I replaced the check valve with one from an 86 900T. This valve goes
from the valve cover to the intake manifold. It was working but is
bigger diameter (inside diam) and has much freer flow.

It made the problem with the engine cutting out significantly worse, and
I mean SIGNIFICANTLY WORSE. The car was barely driveable. This makes me
think we are on to something.

So I put the old check valve back. I took out the solenoid valve and
checked it; it seems to work. The hose from the solenoid back to the TCS
unit seemed to be a bit cracked on each end, so I replaced that.

Next is to get new plugs, replace the check valve with a new one and
make a switch to read out the codes via the check engine light. I might
wait to put in the new plugs to see if the check valve fixes it.

I already replaced the manifold check valve 'cause it was blowing oil
out the dipstick and I didn't like that. The 900T check valve worked
just fine there but I went and bought the proper part and put it in a
few months ago.

Thanks for your help!

Merry Christmas!

Charles

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Dexter J - 22 Dec 2005 00:40 GMT

Salutations:

>> Salutations:
>>
[quoted text clipped - 34 lines]
>
> Charles

A plesure brother Charles - Merry Christmas.

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