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Old 04-13-2007, 10:12 PM   #1
Carlyle
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Default crank position sensor

What are the symptoms of a bad CPS besides not starting when warm?
Will it idle rough at operating temp?

Will it run rich?

Will it throw a code 45?

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Old 04-13-2007, 10:16 PM   #2
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Default Re: crank position sensor

Generally when the crank position sensor fails the engine doesn't run. The computer thinks the engine has stopped turning so it turns off the fuel.

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Old 04-13-2007, 10:16 PM   #3
yazhere
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Default Re: crank position sensor

I don't think so...

If its running rich at start up... the first item to look at is the ECTS..

Your code 45 is an EGR issue...

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Old 04-13-2007, 11:46 PM   #4
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Default Re: crank position sensor

Actually a code 45 indicates a rich condition. Main cause of is a bad coolant temp sensor.

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Old 04-13-2007, 11:48 PM   #5
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Default Re: crank position sensor

the ECTS and connector is new. EGR and every other sensor on the car is new, cant figure this out

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Old 04-13-2007, 11:50 PM   #6
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Default Re: crank position sensor

is it possible my coil packs are not firing hot enough?

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Old 04-14-2007, 12:38 AM   #7
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Default Re: crank position sensor

Quote:
Originally Posted by Carlyle View Post
the ECTS and connector is new. EGR and every other sensor on the car is new, cant figure this out
Did you install a Saturn ECTS? Are the spliced pigtail connections good? (That's where I'd look first if it was me.)

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Old 04-14-2007, 03:10 AM   #8
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Default Re: crank position sensor

I got a Autozone ECTS, and the connections are good. I can't figure why it runs rich. Only when warm, when cold, it runs great, it's almost as if the ECM isn't changing the amount of fuel from startup to operating temp.

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Old 04-14-2007, 07:44 AM   #9
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Default Re: crank position sensor

It really sounds like you have either the wrong sensor or it is not connected properly.

There are two sensors in the head of a 91-95. They look very similar but are very different.

1. The ECTS (Saturn part# 21025106) is the one with the two wire connected to it. It is usually in the lower part of the head.

2. The Temperture Gauge sensor (Saturn part# 21020124) is the one with the single wire connected to it. It is usually in the upper part of the head.

The connectors are keyed different but can be connect to the wrong sensor. (Yea, I did this once) Also the variable resistance level is totally different between the two sensors.

Last thought. Is your IAT sensor connected? With an open IAT the engine thinks that it is freezing outside and runs very rich. Really get terrible gas milage too.

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Old 04-14-2007, 02:37 PM   #10
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Default Re: crank position sensor

Does the FAN kick on when you expect it to?

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Old 04-15-2007, 01:52 PM   #11
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Default Re: crank position sensor

i have a manual fan. but it used to.

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