Does anyone know where the cam shaft sensor is on a 1993 3.1 MP FI

[Prof BruJoe]

I found the crankshaft sensor under the engine next to the oil pan, and the PCV in back above the spark plugs. I can't find the CPS.

My engine will run for about about ten to twenty minutes and then shut down and it won't start for several hours or over night.

thanks,

Bruce

[richtazz]

The cam sensor is located in the top of the block just above the timing cover. It has a 14" or so long harness that goes in behind the alternator, and is held in the block by one bolt.

[Prof BruJoe]

Thanks,

I looked there. Maybe I'm an idiot but still can't find it. I had the original engine replaced last summer, the top of this engine has the air intake manifold with 3.1 Multi-port FI stamped on it. Is it possible there is a different size engine under that manifold? How can I tell other than the imprint on top of the engine if that is really a 3.1 MP FI

[richtazz]

the 93 came with a 3.1 vin m, and possibly a 3.1 vin-t. The vin m has a cam sensor, the vin-t doesn't. If your engine has the flat upper intake, then yours is a vin-t. IF it has the narrow upper plenum that says 3100, then it's a vin-m, and has a cam sensor.

[Prof BruJoe]

Thanks again,
It has a flat upper intake. It reads 3.1 Multi-port FI on the top of the intake. Autozone never asked me what whethe it was a T or M in the VIN but I did tell them it was a 3.1 MP FI engine.

The problem I am having is that the engine will not start if I turn it off after 10-20 minutes of running. It usually takes several hours before it will start again. Any ideas on that?

I'll return the sensor and try something else.

[Prof BruJoe]

Based on VIN autozone says it takes a Wells SU1048 camshaft position sensor. What should I do now?

B

[richtazz]

they are wrong. Your engine doesn't have one. The problem you are describing needs a little more info. When the car won't start, do you have spark? If not, I would say the Crank sensor or Ignition module are getting hot and breaking down on you. If it does have spark, I would have the fuel pressure checked to see if the regulator or fuel pump are failing.

[Prof BruJoe]

Thank you.
I've changed the crankshaft position sensor.

I don't know if there is a spark then when it dies, though. In the winter, it didn't happen. WHen it warmed up it happens. So, I'll have to check that tomorrow.

I will return the cam sensor and have the ignition module, fuel pump and regulator checked.

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i have had the same problem and was hoping for an update to this one.

i have learned from this forum that my car does not have a cam sensor and only has 1 crank sensor. i have the same car. a 1993 pontiac grand prix se with 3.1 multi port fi engine. i have installed a new crank sensor and new coils. when its cold it will fire and sometimes runs 10 mins and sometimes will run 30 and will shut off. it ocationally fires back and will do the same thing, and when it takes a notion it will not fire back. i am not getting fire from my coils. advance auto checked my icm and after 25 test it was so hot you could not touch it, but it always checks good. could it still be the icm? any help would be appriciated!