One of the policies that really backfired was in the 1980s when the USA were worried about Japanese car imports competing with American ones at the cheap end of the market. They decided tariffs would be too unpopular, because they'd drive up prices, so what they did was impose import quotas. But quotas also cause prices to rise (they reduce supply vs demand). Quotas are even more stupid than tariffs. At least a tariff gets you some money to do things with, while quotas push up the price (they're still meant to force you to buy the local expensive version) without the benefit of the spendable tax money.
And on top of that, Japanese car manufacturers actually changed their strategy in response to the quotas. e.g. when there were no quotas, Japanese car manufacturers tried to maximize their profits by selling cheap cars, sell as many as possible. But after quotas, there was a set cap on the number of units sold, so you want to maximize the profit per unit instead. So Japan switched to a strategy of making competitive high-end vehicles and sports cars, while the bottom end of the market was relegated to slightly more over-priced crap than originally. Of course when the quotas were abolished, this put Japanese car makers in a much more competitive position.
And of course there's the big problem with both tariffs and quotas. if it's harder to find an affordable car because of all the protectionism, what effect does that have on the rest of the economy? What do we miss out on because we distorted the market to protect just one industry?