'93 Mercury Cougar - Loud Knocking? - Engine and Car Noises


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'93 Mercury Cougar - Loud Knocking?

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Auto Repair Home>> Automotive Repair>> Engine and Car Noises

iameulogy
New User

Mar 30, 2008, 1:12 PM

Post #1 of 3 (2251 views)

'93 Mercury Cougar - Loud Knocking?	Sign In

I can start my car just fine. But after my car warms up, it starts a loud knocking sound. At low speeds it starts to stop if i push on the gas hard, but it comes back after it shifts. After driving it for a while, i go to park and it dies. Sometimes it starts right up afterwords, sometimes it takes 10-15 minutes. The oil was just changed and checked before I posted here. Also, my coolant is full, all fluids are fine. It hasnt died on me on the road driving, only when I come to a stop at stoplights. I'm not a complete newbie about cars, but i'm not a certified mechanic. Can anyone help? I have a 3.8 V6, new alternator, new battery, new battery cables, and when i got it, either someone did a heck of a job cleaning it, or I have a new engine and tranny under the hood. So i'm at a miss of what it could be..

(This post was edited by iameulogy on Mar 30, 2008, 1:17 PM)

dave284
Enthusiast

Apr 2, 2008, 7:46 AM

Post #2 of 3 (2233 views)

Re: '93 Mercury Cougar - Loud Knocking?	Sign In

Most times when you hear the word (knock) and engine its not a good sign....at my best guess I would think rod bearings...I would suggest getting a oil pressure test and have the timing check too before investing any more money in parts

brbettge
User

Apr 9, 2008, 8:29 AM

Post #3 of 3 (2223 views)

Re: '93 Mercury Cougar - Loud Knocking?	Sign In

besides(not in addition to) what dave told you you may have another problem.if this is a new/used engine that has just been installed the torque convertor bolts may be loose. these bolts actually connect your engine to the torque convertor. there may also be a crack or break in the flywheel..i have seen both of these many times and it does sound just like a rod knocking. the only other possibility i can come up with is a time chain slap. but the chain would have to be very loose for this and the car would not run well. check the bolts first and at the same time try to see any small "lines" running over your flywheel - kind of like someone drew lines with a pencil...these are cracks verified by scratching your fingernail over them you will feel them when this is done

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