Tach

[Mudd]

My tach sometimes works and sometime does not. Any ideas. Also, does anybody have a printable complete vacuum diagram for a 1987 944 NA.

[djnolan]

I remember a thread not too long ago about a flaky tach most likely being caused by a bad solder joint(s). These can be repaired if you are careful.

Fixed; Intermittent tach

[16vCorey]

Yep, and the contacts on the printed circuit where the bolts go though also get corroded and make bad connections. I pulled my cluster, took the tach out, cleaned all the contacts, then hit all the solder joints on the back of the tach with a soldering iron just long enough so they'd flow. Put it back together and haven't had a problem since.

[Mudd]

That sounds easy enough, I may be able to to do it. Of course I will have to wait until the weather warms up a bit. Next week the high daily temps will be in the 20s. I hate winter in Cincinnati.
How about a vacuum diagram.
Thanks

[ernie9944]

^[

[Mudd]

Does that diagram show the vacuum lines?

[ernie9944]

^[

[ernie9944]

Originally Posted by Mudd

Does that diagram show the vacuum lines?

Follow the dots-------------------

[Mudd]

Where is the heater valve in this diagram.

[ernie9944]

Originally Posted by Mudd

Where is the heater valve in this diagram.

???????????

[Mudd]

Does the heater valve have a vacuum line attached to it.

[ernie9944]

What do you mean by heater valve ,are you talking abour what we call the (cold start valve)?

[Mudd]

heater control valve

[Volhv]

It's "J" in the picture.

Edit:
Hmm. Nope that's not it.

[16vCorey]

The late 944 heater control valve is vacuum operated, the early is cable. I don't have a diagram to help you though!

[ernie9944]

Originally Posted by Mudd

heater control valve

Heater control valve.

[Gawernator]

Not sure how this went from Tach to heater control valve but pelican says this is the HCV 92857457303

[Volhv]

The valve circled in Ernie's picture is in fact an emissions control valve, and its hoses lead to the charcoal canister, and fuel tank. "J" in the diagram.

The heater control valve is the thing leaking in Gawernator's engine bay. Located between the head, and heater core.

[Gawernator]

Originally Posted by Volhv

The valve circled in Ernie's picture is in fact an emissions control valve, and its hoses lead to the charcoal canister, and fuel tank. "J" in the diagram.

The heater control valve is the thing leaking in Gawernator's engine bay. Located between the head, and heater core.

Exactly! Hopefully such will not be the case within a few day's time. Just waiting on the mail now

[ernie9944]

Originally Posted by Gawernator

Not sure how this went from Tach to heater control valve but pelican says this is the HCV 92857457303

_________+1 AND VERY VERY CONFUSING


The heater control valve is the thing leaking in Gawernator's engine bay. Located between the head, and heater core.[/QUOTE]_________+1 on the location & the early car like mention was cable operated.On late car it is vacum operated and is in the same location or almost.

Early car HCVHCV location on early car