Cadillac Repair: HT4100 Knock at idle, San diego certified forensic locksmith, orange county court qualified plaintiffs forensic locksmit

Question
Hello,

I have an 84 El Dorado with the HT4100 engine. This engine has now developed a loud top end knock that we can't identify. The engine starts easily and seems to actually run fine, however the knock is too loud to actually use the vehicle. Oil pressure doesn't seem affected and the noise is not consistent. It is always there but sometimes varies from a knock to more of a squeel or back and forth. I am starting to wonder if this could be a cam bearing, or if something simpler could possibly be at play. I appreciate the help.

Thank you,
Reese

Answer
Hello,

Anyone that has had the ht 4100 is usually familiar with the knock. Either the engine knocked or if you were real fortunate like me with my 88 Allante, it did not knock, but my 84 Eldo did. These engines were common to knock right off the showroom floor.

I have been told it is wrist pins, but these engines ran fine with the knock. Even if you change cam bearings, rod bearings, it is not going away. We used to say it was built in from the factory.
Even if you replaced with a brand new GM target master $5,000 later, you might stil have a engine that may have a knock and then you would be real upset!

This engine came out (all aluminum) in 1982.
They used it until 1989 or 1990 when they changed to the 4.5, the in 1992 they went to the 4.9 and in 1993 the northstar.
The 4.5 and 4.9 rattled to but not like the 4100.
I realize you might not be satisfied with my answer because it is a Cadillac. Cadillac made crappy engines for years.

If you go to a caddy dealer and find a tech that has been around 20 years, ask him about the quality of the ht 4100.

It shouldn't blow up on you, but the sound can drive you nuts.
I have owned over 20 Caddys and many with the 4100.

I now own a Chevy truck with a 454.

Good luck!


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