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Cadillac Repair/91 cadillac sedan deville
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Question
I JUST PURCHASED A 91 CADILLAC 4.9 WITH 99,000 MILES IT HAS A LOW END KNOCK WHEN STARTING AND WHEN DRIVING. I CHANGED THE OIL TWICE WITHIN FIVE DAYS SINCE I BOUGHT IT. THE ONLY PROBLEM WAS IT NEEDED A CATALYTIC CONVERTER WHICH WAS REPLACED BY A REPAIR SHOP. I USED PENNZOIL SYNTHETIC 10/30. IT RUNS GOOD, PLENTY OF POWER, WELL TAKEN CARE OF BY AN OLDER GENTLEMAN WHO WIFE PASSED AWAY. THE CAR SAT UNTIL I PURCHASED IT. IT WAS WELL MAINTAINED BEFORE I PURCHASED IT. I AM THE SECOND OWNER OF THIS VEHICLE, WHAT COULD BE THE PROBLEM ................ PLEASE HELP AS I'M AT A LOSS. YOUR HELP WOULD BE "GREATLY APPRECIATED".
A low end knock could be:
crankshaft MAIN bearing(s).
Piston(s) CONNECTING rod bearing(s).
Without personally having access to the vehicle and hearing it myself an accurate diagnosis is most impossible.
You can try isolating which cylinder is causing the noise by pulling a spark plug with the engine running and see if the noise changes in intensity. Do this with each cylinder.
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Questioner's Rating
| Rating(1-10) | Knowledgeability = 10 | Clarity of Response = 10 | Politeness = 10 |
| Comment | I just wanted to thank you for getting back to me so quickly. As you probably can imagine, I've been pulling my hair out over this one since I JUST PURCHASED the vehicle. However, you have been a GREAT HELP and I will mostly definately RECOMMEND your site, as well as use your services, I sure in the future. Thanks again and thanks for what you do for us people out there with NO MEANS to take the vehicle into the shop just to get the results you provided. WELL DONE!!!!! Regards, Rich | ||
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autohelp
Expertise
On hands professional expertise in all aspects of Cadillac diagnostics and repair mid 1970`s thru 2000 year vehicles. GM certified in electronic fuel injection, Automatic transmission, Heating and A/C, and onboard vehicle computer diagnostics.
Experience
Held over 15 GM certifications prior to retirement in 1989.
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Prior to retirement held several ASE certifications, numerous Factory certifications.
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