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Car is shaking

(1999 Ford Escort)
in Schaumburg, IL on June 23, 2011
When driving my car past 40mph the car begins to shake. The check engine light comes on and does not blink. I've taken it to the shop where they hooked it up to a computer and they didn't find anything. After doing some research on the internet, I've seen a lot of people saying this problem is due to a bad coil pack.

So my question is if the problem is indeed a coil pack, would that show on the diagnostic test done at the shop?
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Popular Answer
on June 23, 2011
If a code was set when cel came on they should have picked that up with a scanner. Even if cel goes out it should have kept the code in memory. Have another shop look at it. What may have happened was that there was a code for a misfire but at the time the shop did diagnostics the coil pack was ok and did not show as bad. That may be what they meant. Intermittent probs can be a bitch to pinpoint.
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on May 09, 2012
The model year of 1999 is a problem for the Escort when it comes to engine mounting. I have had two of the same cars and the thing is that the engine is not mounted 100% correctly and can cause a shaking/vibrating as the car gets older. Try taking to the Ford dealership and in some cases they will remount for you.
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