Engine Speed Sensor plug
Thread Starter
Burning Brakes
Joined: Oct 2008
Posts: 972
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From: Palo Alto, CA
Engine Speed Sensor plug
Hi there!
I'm new to the community, but I've had my 928 for almost 6 years now. It's given me very few problems (that weren't my own damn fault), and I generally couldn't be happier.
However, I need to find the engine speed sensor plug, as my car isn't starting, and I've checked the fuel system and I know there is power through both the B+ terminal and the EZK relay. The next step in the manual suggests testing the signal at the EZK connector, and if there is no signal there, to check the plug on the wiring harness. Where can I find this plug? Thanks!
Supplementary info:
Several years ago, I managed to bottom the car out, and I was able to helicoil the alternator back onto the block. This fix worked for several years, but finally gave out, so I pulled the engine, took it to a welder, and got it all fixed up. Now the engine is back in the car, and it cranks just fine, and the injection system has power to it, but I get no spark. I pulled off the spark plug wires on both sides and grounded them to the block and got nothing, so the problem is clearly between the wires and the ignition computer. I hooked up the EZK terminals as per the manual to an oscilloscope, and got nothing for the speed sensor, hence my question. There is a connector on the passenger side near the front of the engine that is mounted in a bracket. The male plug partially disintegrated in my hand, but enough of the plug remains that I thought I could plug it back into wherever the hell it's supposed to go. When I put the engine back together, I had one plug from the harness remaining, conveniently with three pins perfectly spaced to fit into my now-broken connector. If I had to guess, I would say that this is the speed sensor plug, and I obviously need to replace it. However, if it is NOT the speed sensor plug, then what IS it, and where does it go?
Thanks for the help, I can provide more info if needed.
Thomas
I'm new to the community, but I've had my 928 for almost 6 years now. It's given me very few problems (that weren't my own damn fault), and I generally couldn't be happier.
However, I need to find the engine speed sensor plug, as my car isn't starting, and I've checked the fuel system and I know there is power through both the B+ terminal and the EZK relay. The next step in the manual suggests testing the signal at the EZK connector, and if there is no signal there, to check the plug on the wiring harness. Where can I find this plug? Thanks!
Supplementary info:
Several years ago, I managed to bottom the car out, and I was able to helicoil the alternator back onto the block. This fix worked for several years, but finally gave out, so I pulled the engine, took it to a welder, and got it all fixed up. Now the engine is back in the car, and it cranks just fine, and the injection system has power to it, but I get no spark. I pulled off the spark plug wires on both sides and grounded them to the block and got nothing, so the problem is clearly between the wires and the ignition computer. I hooked up the EZK terminals as per the manual to an oscilloscope, and got nothing for the speed sensor, hence my question. There is a connector on the passenger side near the front of the engine that is mounted in a bracket. The male plug partially disintegrated in my hand, but enough of the plug remains that I thought I could plug it back into wherever the hell it's supposed to go. When I put the engine back together, I had one plug from the harness remaining, conveniently with three pins perfectly spaced to fit into my now-broken connector. If I had to guess, I would say that this is the speed sensor plug, and I obviously need to replace it. However, if it is NOT the speed sensor plug, then what IS it, and where does it go?
Thanks for the help, I can provide more info if needed.
Thomas
Team Owner
Joined: May 2004
Posts: 31,160
Likes: 4,157
From: Philly PA
Hi , Welcome to the board, first can you please post the year and model of your car and trans type.
If its later than a 87 then the connector with 3 pins by the front of the right cylinder head is for the Hall sensor this sensor is screwed into the rear side of the cam pulley housing.
There might be 2 speed sensors depending on the year of your car.
The speed(CPS) sensor/s are located on the top ,rear, center of the block .
The forward sensor, if you have 2 is for the Ignition system, the connection point is very close to the rear of the driver side fuel injector rail (below it) the rear sensor is for the Dealer diagnostic system.
You can check the speed sensor with it in place by checking for a pulse while the engine is being cranked.
From your description it sounds like your car is ready for a top end refresh this will include the intake rubbers and both knock sensors(depending on year) the crank position sensor the throttle position sensor the hall sensor( On the right front cylinder head)
If its later than a 87 then the connector with 3 pins by the front of the right cylinder head is for the Hall sensor this sensor is screwed into the rear side of the cam pulley housing.
There might be 2 speed sensors depending on the year of your car.
The speed(CPS) sensor/s are located on the top ,rear, center of the block .
The forward sensor, if you have 2 is for the Ignition system, the connection point is very close to the rear of the driver side fuel injector rail (below it) the rear sensor is for the Dealer diagnostic system.
You can check the speed sensor with it in place by checking for a pulse while the engine is being cranked.
From your description it sounds like your car is ready for a top end refresh this will include the intake rubbers and both knock sensors(depending on year) the crank position sensor the throttle position sensor the hall sensor( On the right front cylinder head)