Bad Espresso? How to Diagnose and Fix Your Shot

Espresso is the least forgiving brew method there is. One click on the grinder or half a gram of dose can flip a shot from sweet to sour. Frustrating, yes, but also fixable once you know what to look for.

This guide gives you a repeatable recipe, a taste-based fix list and a reality check on what your puck can and cannot tell you. It is inspired by the dial-in approach of Lance Hedrick and James Hoffmann.

Not following what we are writing about? Start here: Manual Espresso Quick Start.

Start With a Recipe You Can Repeat

The usual starting point is a 1:2 ratio: 18 g of ground coffee in, 36 g of espresso out, in roughly 25 to 32 seconds, with water around 93 °C. Weigh both the dose and the yield. Judging by volume or crema is guesswork.

Treat this as a starting point, not a law. Roast level moves it: light roasts usually taste best with a longer ratio (roughly 1:2.5 to 1:3) and hotter water, while medium and dark roasts do well with a shorter one (roughly 1:1.5 to 1:2) and slightly cooler water.

Then follow three rules:

• Fix your dose. Pick a dose that fits your basket (18 g is common) and leave it alone.
• Fix your ratio and yield. Pick a ratio (1:2 is a good start), multiply it by your dose, and stop the shot at that weight every time. For 18 g at 1:2, that is 36 g.
• Change one thing at a time. Where your machine lets you, change yield first and grind second. Shot time is the result of your grind, so treat it as feedback rather than a target.

Taste First, Then Adjust

• Sour, sharp, thin: Under-extraction. Let the shot run a little longer, for example from 36 g up to 40 g. Still sharp? Grind finer.
• Bitter, dry, ashy: Over-extraction. Stop the shot a little earlier. Still too bitter? Grind coarser.
• Sour and bitter at once: Usually channeling, where water carves a fast path through the puck. Fix your puck prep before touching the grind: break up clumps (a WDT tool with thin needles or a shaker works), level the bed and tamp level.
• Hollow, flat: Often uneven flow. Check that your dose fits the basket and that your tamp is level.
• Gushing in under 20 seconds: The grind is too coarse, or the dose is too low for the basket.
• Barely dripping: The grind is too fine, or the dose is too high. Go coarser in small steps.

Keep your moves small: one step on the grinder, or two to five grams of yield at a time.

Using a lever machine? On a La Pavoni or similar, the water in the chamber sets your yield, and lifting the lever to refill breaks the puck, so you can stop a shot early but not stretch it. To get a longer ratio, lower your dose by a gram or so instead (for example 16 g rather than 18 g), and lean on grind as your main dial. Keep the dose within what your basket holds.

What Your Puck Can (and Cannot) Tell You

Old advice says a soupy, sunken puck means something went wrong. In practice, wet pucks are normal. After the pump stops, water simply sits above and inside the coffee, and the bigger the gap between puck and shower screen, the soggier it looks. A wet puck is a far lesser evil than an uneven extraction.

Two things are worth checking:

• Shower screen imprint: If the puck is pressed hard against the screen, you probably overdosed. That can cause uneven flow.
• Visible channels or cracks: These point to a problem with distribution or tamping, such as clumps or a crooked tamp. Even so, a clean-looking puck does not guarantee a perfect shot, because tiny channels are invisible.

Taste the shot first. Judge the puck second.

Check the Basics Before Blaming Your Technique

• Bean freshness: Very fresh beans are full of CO2 and can be hard to dial in. Fresh specialty coffee stays very good for its first few months when stored sealed, cool and dark (see our storage guide), but as it ages the grind that worked last week may need a small adjustment. Re-dial when you open a new bag, and again as the bag ages.
• Basket fit: Dose to the capacity of your basket. Too little and too much both create trouble.
• Grinder consistency: A grinder that cannot hold a fine, even setting makes every other fix harder.

One Variable at a Time

It is tempting to change grind, dose and tamp pressure in one go. Resist. Change one thing, pull another shot and taste again. Otherwise you will never know what fixed it, or what broke it.

The Verdict

Dialing in should feel like a small daily puzzle. Lock your recipe, trust your palate over any number on a screen, and write down what works. The perfect shot is the one that tastes right to you, today.

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Dial In With the Right Beans

A good dial-in starts with beans roasted for espresso. Browse our espresso beans, pick a roast style you like and use the 1:2 recipe above as your starting point.