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Old August 20th, 2007, 10:22 PM   #1
Rainbird1099
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Default Spark knock

I am getting what I believe to be spark knock in my girlfreind's 93 Tempo.
I originaly thought it was the power steering pump, by identifying the knocking sound with a wooden dowel rod.
The car knocks at idle, and when under load (wheel locked, or heat / ac on).
It give a slight knock occasionally at idle, loud when under load, or in neutral at idle.
I have cheacked the air filter, and have cleaned the Mass air flow sensor (with elictral spray contact cleaner).
There is a second sensor at the other end of the air duct that the MAF is on.
Unless someone else has an idea, next I will clean this sensor, and re-clean the MAF.

Thanks in advance.

Scott
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Old August 20th, 2007, 10:26 PM   #2
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I'd look deeper into the engine for that knock.

Bottom end would be my first guess...
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Old August 20th, 2007, 11:02 PM   #3
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There are a few things that can throw you off on a knock.

Is it loader when the engine is cold? - Exhaust gasket.

Tried high octane fuel and it went away? or minimized?


Edit:
Oh - 93 Tempo - scrap it - jk

I did however see a lot of those engines take a crap - lots of airflow through the valve cover (oil fill) was the first clue.
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Old August 21st, 2007, 12:10 AM   #4
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valve cover does not look great. I will try premium gas, and see, as far as if it does it more when cold I will drive it for a couple of days and see.
The car overall is in good shape less than 80k on it.

I don't think I mentioned, when I took the belt off and started it, the sound was gone, that is why I started looking at external components, and ruled out the concerns in the block.
I then did the back yard Mechanic's trick of listening with a dowel rod, to try to pick up the knocking. From this it sounded like it could have been the power steering, or the a/c unit. Power steering pump was more crucial, I tried that one first.

Thanks again for the help and suggestions.
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Old August 21st, 2007, 11:25 AM   #5
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Quote:
Originally Posted by Rainbird1099 View Post
valve cover does not look great. I will try premium gas, and see, as far as if it does it more when cold I will drive it for a couple of days and see.
The car overall is in good shape less than 80k on it.

I don't think I mentioned, when I took the belt off and started it, the sound was gone, that is why I started looking at external components, and ruled out the concerns in the block.
I then did the back yard Mechanic's trick of listening with a dowel rod, to try to pick up the knocking. From this it sounded like it could have been the power steering, or the a/c unit. Power steering pump was more crucial, I tried that one first.

Thanks again for the help and suggestions.
Then that would make sense to be an external accessory. AC Compressor - common.
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Old August 21st, 2007, 03:47 PM   #6
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Any way to verify it is, before I spend the time and money to replace the "chance" of that being it?
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Old August 21st, 2007, 04:11 PM   #7
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get a belt for a non ac car and bypass the ac unit
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Old August 21st, 2007, 04:14 PM   #8
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AC and PS pumps will knock
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Old August 21st, 2007, 08:06 PM   #9
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look for a wobbly pulley. Or engage the AC compressor and listen for a change. Or turn the wheel to lock load the PS pump and listen for a change
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