# 1985 Cadillac Eldorado and Acceleration Issue **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [September 26, 2009, 10:11pm UTC](https://community.cartalk.com/t/1985-cadillac-eldorado-and-acceleration-issue/37200 "2009-09-26T22:11:08Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![oldsfan](https://avatars.discourse-cdn.com/v4/letter/o/e0b2c6/32.png) [@oldsfan](https://community.cartalk.com/u/oldsfan)\ **Post date:** [September 26, 2009, 10:11pm UTC](https://community.cartalk.com/t/1985-cadillac-eldorado-and-acceleration-issue/37200/1 "2009-09-26T22:11:08Z")
Had the chance to drive a clean 85 Eldorado Biarritz today. What a beautiful car! The car is all original and has a rebuilt HT4100 engine. I have always heard that engine was not enough to power this model, and I experienced that today. The car “labored” to enter the freeway as I depressed the accelerator. It did accelerate, but there was a slight labor popping sound – nothing metallic – just a very light popping noise as I depressed the accelerator hard. It stopped as the car gained highway speed - the car ran and rode beautifully then. It also has no noise or issue during in-town driving. It’s the acceleration. Is this a normal feature for this car? Thanks ---
**Author:** ![Roadrunner](https://avatars.discourse-cdn.com/v4/letter/r/d2c977/32.png) [@Roadrunner](https://community.cartalk.com/u/Roadrunner)\ **Post date:** [September 27, 2009, 1:36am UTC](https://community.cartalk.com/t/1985-cadillac-eldorado-and-acceleration-issue/37200/2 "2009-09-27T01:36:20Z")
Maybe a faulty accelerator pump in the carb. Perhaps a weak spring. ---
**Author:** ![mcparadise](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mcparadise/32/32_2.png) [@mcparadise](https://community.cartalk.com/u/mcparadise)\ **Post date:** [September 27, 2009, 5:36am UTC](https://community.cartalk.com/t/1985-cadillac-eldorado-and-acceleration-issue/37200/3 "2009-09-27T05:36:31Z")
The car is NOT all original. It has a rebuilt HT4100 engine, you said that yourself, and you didn’t like the acceleration. Why are you even thinking about buying this car? Move on, and find something that runs correctly. I don’t know why you prefer these 80’s pimp-mobiles, but that seems to be where you’re concentrating your attention. Good luck, but don’t buy a car that doesn’t run right. You’ll have nothing but trouble. ---
**Author:** ![oldsfan](https://avatars.discourse-cdn.com/v4/letter/o/e0b2c6/32.png) [@oldsfan](https://community.cartalk.com/u/oldsfan)\ **Post date:** [September 27, 2009, 6:33am UTC](https://community.cartalk.com/t/1985-cadillac-eldorado-and-acceleration-issue/37200/4 "2009-09-27T06:33:19Z")
I stated “original” in reference to all the other aspects of the car – meaning that the owner has made an effort not to change the interior, upgrade options, etc. As for my car preferences, I guess we all have our favorites. I like this model (85 Eldorado) and have avoided buying one for years because of my concern about the 4.1 engine. I just want a car for weekend cruising. This is a hobby for me - not a daily driver purchase. What I am seeking is feedback on the performance of this car. If the engine indeed is truly underpowered – and if this underpowering could result in a labor-knock or slight noise during acceleration - then I want to know so I can determine if this is an issue to expect – or one to question. The car runs beautifully and quietly at all other times – just the noise during on-ramp or intense acceleration and then no noise. I am just asking for help from those who may have had experience with these cars. Just need advice. Thanks