Strange noise at WOT... - TCCoA Forums
 
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post #1 of 12 (permalink) Old 02-05-2008, 11:48 PM Thread Starter
 
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Strange noise at WOT...

The car is a '94 SC/AT. It had been sitting in my driveway since Sept of '02 when it was replaced with a Mercury Marauder. As luck would have it, several weeks ago my niece smashed up her Contour. My brother-in-law gave her his Taurus, and I gave him the T-bird. It only needed some minor repairs to be made road-worthy.

Last Saturday I got a chance to drive the old girl again. When I stepped on it fairly hard, there was a loud sound from the front that I can only describe as a sharp "clack". I immediately backed off the throttle and the car seemed normal. A little further down the road I had a chance to step on it again and had the same thing happen, only this time I noticed that when the "clack" sound occurred, the boost gauge went from 12 to 15 lbs. I let up again immediately and drove the car back to its new home.

The car sounds and drives normally otherwise. Has anyone heard of anything like this?
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post #2 of 12 (permalink) Old 02-06-2008, 09:56 AM
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It is possible you heard some loud detonation...was the gas old I assume?

14-year SC owner - '93 SC AOD (non-locking TC)

It's only impossible until we do it.

12.550 @ 111.09, 1.917 60ft, No nitrous.
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post #3 of 12 (permalink) Old 02-06-2008, 04:22 PM Thread Starter
 
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No, there was very little gas in it while it sat, and that had all been burned through. I know what detonation sounds like and this wasn't it...this was a single sharp "clack"...the best I can describe the sound is if you took one of those flat wooden paint-stirrers and slapped it down on your kitchen counter, once.
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post #4 of 12 (permalink) Old 02-06-2008, 08:01 PM
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It could be a torn driver's side motor mount and the "clack" is the metal tab hitting the inside of the bracket as the engine torques.

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post #5 of 12 (permalink) Old 02-07-2008, 01:50 AM Thread Starter
 
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OK, but then why did my boost gauge go from 12 to 15 at the exact same time?
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post #6 of 12 (permalink) Old 02-07-2008, 02:39 AM
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Because the supercharger built boost! I don't know. Take a suggestion or leave it.

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post #7 of 12 (permalink) Old 02-07-2008, 09:37 AM Thread Starter
 
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Quote:
Originally Posted by master486 View Post
Take a suggestion or leave it.
There's no need to be rude...

I was just asking how a broken motor mount could cause the boost, which has never gone above 12 in 152,000 miles of driving, to sudden peg at 15 at the exact same time the strange noise occurred. If there's a logical explanation, then I'm all ears.
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post #8 of 12 (permalink) Old 02-07-2008, 10:27 AM
 
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my 92 did tis it was a broken catastrophic converter it would move and block the exh and boost would climb because of back pressure in exh.
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post #9 of 12 (permalink) Old 02-07-2008, 02:43 PM
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I wasn't being rude at all.

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post #10 of 12 (permalink) Old 02-07-2008, 04:39 PM Thread Starter
 
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It's been "one of those days", so maybe I took your "take it or leave it" comment the wrong way...if so, I apologise.
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post #11 of 12 (permalink) Old 02-07-2008, 05:14 PM
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No worries.

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post #12 of 12 (permalink) Old 02-19-2008, 10:08 AM
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after mine sitting for 1&1/2 years and with old gas, i took mine around the block last night to test the trans after rebuild. i got a loud clacking (read: repeating clack-clack-clack) in a very fast repetition. I'm going to chalk it up to old gas. today I'm going to throw in a bottle of octane booster along with a tank full of premium ( only 91 octane here in north cal ) and I'll repost later tonight to say if that was the problem.
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