Wiring sensor part missing?
 

I got this 87-924 in pieces. Blown belts. Got all the documentations and books needed to rebuild this but seem to be missing a part? I can locate all hookup in the wiring and hoses except two. Under the intake manafold there are two conections. One is a square two pin and the other is a round three pin that appears to go to the reference sensor. Both face each other. Is there somthing in the middle for both these??

Same engine and vacuum setup as an 86 through 88.

IIRC there is the idle control valve under the center of the intake and towared the front of the engine there is the temp sender for the dash then the temp sender for the DME.

What documentation do you have?

I think he means by the firewall. isn't the round 3 pin for dealer diagnostics and thus 'not used'?

Thanks. Still not clear. It's not the idle control valve. That's a four pin rectangular and two air hoses. But right beside/close is the three pin and two pin rectangular. Do they go to nothing? Following the three/round, it goes to the sensorcloser to the front -reference sensor. Hayes manual shows it going to the computer but no matching conector near by. The other I havn't found in the schematics fro Hayes, Pelican doc's or from clarks-garage.

The Hayes is for the early 944's. Your wiring is for the later 944's. There are changes in the wiring, the vacuum manifolds and the fuel delivery manifold.

You need the correct documentation.

but he has a 924S...can't he use the Hayes?

In review; kind of. Been getting a couple of threads mixed up. It looks like the engine basics are the same as the early 944's. There were some changes in the fuel delivery design. The idle bypass valve (positioner) is a three wire like the later 944's. Throttle switch is the same connector as is the AFS connector.

any chance one of these is for a Porsche fitted car alarm like the 'early' has

The three pin goes directly to the reference sensor and lays right on the head under the intake manifold around 5 inches from the 2 pin square connector that curves around and goes back into the main harness. Not the idler valve. It's the next square conector in that line and before the next two(throtle control 3 pin-AFM 4 pin). They face each other like there's suposed to be somthing in between? Are they related and were do they go? Schematics show the connector to the reference sensor then to the controler. None of the documentation shows any detail.

Need pictures.

OK, I'll get one if I can. There is a change. Couldn't see correctly as it right under the large harness and I needed to get right in there. The three pin conector doesn't go to the reference sensor but just below it, Reference and speed, by 1-2 inches is another conector. What is this?