GreenLantern is totally right. However, I know of quite a few more cars than not that have driven around on noisy DMF's for months and months without letting loose. And then there are those that show signs for not long at all before they decide to come apart.
I was the first one in our shop to run through the procedure on the testing device about a month ago. First, you test the specific gravity of the fuel sample. There are several options and, depending upon the outcome, you either fail the fuel right away or continue to the cylinder test.
The...
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