Already searched... are both early 7a crank position sensors the same?

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Old 08-16-2007, 01:11 PM
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Default Already searched... are both early 7a crank position sensors the same?

I have the normal wont start when hot condition and i am wondering if i should just replace both. also found these online, not listed under our cars but the # crosses...

are they the right thing?<ul><li><a href="http://www.rockauto.com/catalog/raframecatalog.php?catalog=154&amp;partnum=PC491&a mp;a=FR154-PC491">http://www.rockauto.com/catalog/raframecatalog.php?catalog=154&amp;partnum=PC491&a mp;a=FR154-PC491</a</li></ul>
Old 08-16-2007, 01:32 PM
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I think ALL 20v 5cyl CPS's are the same.
Old 08-16-2007, 01:44 PM
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Default yeah, they appear to be the same visually... if i am not mistaken one is for starting

and the other is to keep timing while running. weird setup if you ask me
Old 08-16-2007, 01:47 PM
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You are mistaken. What you see are the crank sensor and the rpm sensor.
Old 08-16-2007, 02:15 PM
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Default okay, so here is what i dont get then...

once hot the sensor malfunctions. if the car is shut off it wont start again. once the car sits for a while it will start again, everyone has told me this (crank sensor) is what is causing this problem i have.

am i looking into the wrong part? i have had one person mention the cam sensor, but if that was going bad wouldnt it not run once it gets hot enought to malfunction? or is it also just an issue for starting when hot?
Old 08-16-2007, 03:09 PM
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Default Sounds exactly right for a dying crank sensor.

They get hot and fail, once cooled they work again.
Old 08-16-2007, 03:35 PM
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Default rad... thanks nate

drop me an e-mail when you get a chance, i need some more coupe stuff.

i am trying to revive my beater car to be a better DD, lol
Old 08-16-2007, 05:11 PM
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Default Like Nate said...

sounds like the crank sensor. It senses the pin on the flywheel and that's all it does(without going into a ton of detail). Once the car is running it is no longer used. But once you shut it off, it won't start if it's bad.

The 7A does not have a cam sensor. As Gabe pointed out there is a crank sensor and an RPM sensor. Both at the back of the engine.

And as Nate said that's a pretty typical failure mode.
Old 08-16-2007, 05:46 PM
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Default Put the sensor on your portable

scope when it fails the wave form will get pushed to the top of the range.(smashed)
Old 08-16-2007, 05:49 PM
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I have a good test spare. If you want to borrow it.


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