Question about 2005 Cadillac STS

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I have a 2005 STS Cadillac V-8 nortstar engine with 130,000 miles.Had water pump replaced and engine light came on and started making noise on top end. I hooked my cheap diagnostic tool and it read bad cam shaft sensor. I took it back to my mechanic and he said it was the timing chain but couldn't fix it because he didn't have the proper tools. He suggested that i take it to the cadillac dealership which i did. Now they tell me the oil pump is not working properly and that's why it's making the noise but all they could do is offer to replace the engine for $9k. Is it me or does this sound strange?

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God bless your car bro
???? ???????

Posted on Dec 02, 2014

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My cts 2005 wont start but it will crank


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Built Between and Including VIN Breakpoints 50112423 and 50133076
Attention: This inspection should be performed on all vehicles currently in your inventory prior to sale or delivery.
--------------------------------------------------------------------------------
Condition
Some customers may comment on one or more of the following conditions:
• Engine Will Not Start
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• IP Gauges/Lighting Inoperative
• Radio Inoperative
• HVAC Display Erratic
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Correction
Inspect both rear door wiring harnesses. Repair any damaged wires and reroute harness to correct location. Use the procedure listed below.
Make sure the ignition is off.
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********
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