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Old 05-09-2011, 06:22 PM   #1
Ronburton330i
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Loss of power

My car has all the symptoms of a failing CPS. But I was wondering is the loss of power ALSO a symptom of the bad CPS or is that attributed to something else? Please advise!!!! Also I can't find a DIY on replacing the CPS...any help with that?????
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Old 05-09-2011, 06:26 PM   #2
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what are the symptoms?
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Old 05-09-2011, 06:47 PM   #3
Ronburton330i
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It idles rough and it fluctuates RPM as well especially when cold. Also this morning it didn't start 3 times before finally going on the 4th try.
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Old 05-09-2011, 07:47 PM   #4
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It idles rough and it fluctuates RPM as well especially when cold. Also this morning it didn't start 3 times before finally going on the 4th try.
That last symptom sounds like an sap issue I had...check the hose from pump to valve.

Rough/surging idle sounds like an intake leak and everyone has them...much higher odds here than cps sensor...and there are two camshaft position sensors, and one crankshaft one...cam ps is most common, and intake is right there behind vanos solenoid on my car...remove end cap of solenoid, access intake cps, cut off sensor, tape new connector to it and pull it down from the plug side...plug in.

Don't know where the other sensor is, but it's around, I'm sure. Do you have a code for cps, as I'm pretty sure it would register.
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Old 05-10-2011, 07:50 PM   #5
Ronburton330i
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That last symptom sounds like an sap issue I had...check the hose from pump to valve.

Rough/surging idle sounds like an intake leak and everyone has them...much higher odds here than cps sensor...and there are two camshaft position sensors, and one crankshaft one...cam ps is most common, and intake is right there behind vanos solenoid on my car...remove end cap of solenoid, access intake cps, cut off sensor, tape new connector to it and pull it down from the plug side...plug in.

Don't know where the other sensor is, but it's around, I'm sure. Do you have a code for cps, as I'm pretty sure it would register.
I checked the hose and its pretty mushy haha that's the best adjective to describe it.

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Old 05-10-2011, 07:53 PM   #6
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I checked the hose and its pretty mushy haha that's the best adjective to describe it.

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Replace hose and check inlet to valve...remove gunk as necessary...and I hope that's it.

BTW, check vcg just for grins. I believe my failing vcg may have been implicated in my sap hose corroding internally...from sucking through oil laden vapor coming from vc right next to it.
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Old 07-02-2011, 11:25 PM   #7
Ronburton330i
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The idling and loss of power turned out to be 2 faulty ignition coils. Bought bosch coils from pelican parts now she roars again!!
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