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2005 Cadillac CTS 3.6L V6 YL7 - Won't Start - Sounds like loss of compression


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Does anybody have any suggestions on what this could be. The car will not start, sounds like there is a lack of compression signaling that it could be a timing chain. Anybody experience something similar. I am under the impression that this is a HUGE job to fix. P.S. I have over 100K on it an no warranty.

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How are you deducing that there is low compression? The engine turns on the starter but does not fire? I would not guess a timing chain first, although that is possible. Do you hear mechanical sounds indicating a broken chain or internal damage?

Bruce

2023 Cadillac CT4-V Blackwing

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a 2005 car is too new for "shade tree" diagnosis. tow it to a shop. gulp. bite the bullet. a pro can check spark/fuel in moments. broken TC means a cam position code? worn/damaged chain bits could mean sprocket damage also.

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I had it towed to a shop (admittedly not a Cadillac expert). They measured and said that the compression was at 65lbs. He thinks it’s a failed timing chain and possibly major damage to the valves (interference motor). Said it might be cheaper to buy a used motor. Just looking for other possibilities.

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wow. that is totally premature failure if itis the timing chain.

GM FAN FOREVER

Nice, clean, luxury= fine automobile

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If we specify that your engine has a broken timing chain and possibly or probably internal damage, then your questions is, "what are my options?"

I suppose I agree with your mechanic that putting a separate known good new or used engine in is a more certain option than rebuilding your current engine. I like the idea of rebuilding so that we find out more about what happened, but it can cost more to fix the one you have than to get a used engine on ebay or from a rebuilder. That said, the new price of a 3.6L is pretty high, so I would tend to stay with a used or rebuilt engine.

Bruce

2023 Cadillac CT4-V Blackwing

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I am leary of used engines because of the unknown life or history, Also if the head gasket has failed and had the timeserts done, etc... Mainly because the job is labor intensive and nothing is worse than doing a job and having to redo it again

GM FAN FOREVER

Nice, clean, luxury= fine automobile

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I am leary of used engines because of the unknown life or history, Also if the head gasket has failed and had the timeserts done, etc... Mainly because the job is labor intensive and nothing is worse than doing a job and having to redo it again

It is a CTS with a V6...not a NorthStar. :D

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how hard is it to pull the valve covers on a CTS? could check the timing marks. don't have a CTS manual handy. are both banks of sprockets aligned with marks ala northstar? i have worked on V6 OHC motors before. i think all have similar timing marks.

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