Cadillac & LaSalle Club Discussion Forum

Cadillac & LaSalle Club Forums => Technical / Authenticity => Topic started by: LenInLA on October 10, 2016, 05:11:13 AM

Title: 1976 Eldorado- very loud when first idling
Post by: LenInLA on October 10, 2016, 05:11:13 AM
When I first turn the car on and it idles, the engine is very loud - loud enough to interfere with conversations. As soon as I put the car in drive, the noise disappears. The noise seems to be worst after the car has been standing for a couple of days.

Any ideas?

Thanks!

Leonard Grayver
Title: Re: 1976 Eldorado- very loud when first idling
Post by: The Tassie Devil(le) on October 10, 2016, 05:27:42 AM
If it is an exhaust noise, it could be that when cold, there is a hole, and as it warms up, the heat closes up the hole?

Plus, if the noise is the exhaust banging under the car, when you put it into drive, it applies a rotational force to the engine/trans.   Does the noise stop?   This could be the result of a damaged engine/transmission mounting?

A bit hard to diagnose without hearing it.

Bruce. >:D
Title: Re: 1976 Eldorado- very loud when first idling
Post by: TJ Hopland on October 10, 2016, 09:46:14 AM
You sure its not something like the alternator belt slipping at first? 

Warmed up there is no noise in park? 

Exhaust was a thought if its fine warmed up.     IF its still there warmed up then I was thinking maybe a cracked flexplate.   
Title: Re: 1976 Eldorado- very loud when first idling
Post by: LenInLA on October 10, 2016, 04:35:46 PM
I checked and the alternator belt is loose. I'll replace it and see if it solves the problem!

Thanks for the advice!

Leonard Grayver