Why does my Porsche Cayman S tick on cold start and smoke?

Short answer: On a 987 Cayman S, a ticking on cold start that fades as it warms, puffs of smoke at startup and rising oil use can be signs of bore scoring. That's when the cylinder walls get scratched by the pistons. It's mainly a 3.4L Cayman S issue. Owners and specialists say base 2006–2008 Caymans rarely get it. The only way to know is a borescope (camera) inspection of the cylinders, ideally through the oil pan. Scoring doesn't heal, so plan the repair before it gets worse.

Symptom: A tick or knock at cold idle that goes away when you rev it or it warms up, smoke for a few seconds on startup, oil use that keeps rising, and sometimes oxygen sensor codes or a misfire later on.

What to check first

1. Know your engine. Bore scoring is mostly a 3.4L Cayman S problem. Base 2.7L Caymans rarely get it.
2. Get a borescope inspection, ideally through the oil pan. Specialists say scoring starts low in the cylinder.
3. Track oil use and look at the oil filter for metal at each change.
4. If you're buying one, make the borescope part of the pre-purchase inspection.
5. Don't confuse it with the IMS bearing. That's a separate part with a much lower failure rate on 2006–2008 cars.

Likely causes

1. Cylinder bore scoring. Worn, scratched cylinder walls let oil past and cause piston slap.
2. Normal startup smoke on a flat-six. Some members say a brief puff can be normal, which is why a borescope matters.
3. IMS bearing wear (separate issue). Low failure rate on 2006–2008 cars, but a big repair if it fails.

What it usually costs

Repair means rebuilding or replacing the engine with new cylinder sleeves. A 160,000-mile Cayman S owner on Rennlist hoped to keep a DIY rebuild under $10,000, and members said that was optimistic and that $20,000 or more is possible, more than some of these cars are worth. A borescope inspection costs far less and is worth it before you buy.

Is it safe to keep driving?

Usually drivable for a while, but it gets worse. Members warned that advanced scoring leads to heavy oil use and misfires, and the engine can shed metal that damages other parts. Avoid hard driving and get it inspected. Verify with a mechanic.

DIY or shop?

Shop for the borescope inspection and repair. Skilled DIYers have rebuilt these engines, but parts and machine work add up.

Recalls, bulletins and complaints in plain words

• No recall for bore scoring: We didn't find a recall for bore scoring or the IMS bearing on the Cayman. NHTSA lists 11V409 for 2012 Caymans and other Porsches (seat belts). If your car is part of a recall, the dealer fixes it for free.
• NHTSA complaints: 2 keyword-matched complaints for Porsche Cayman 2006–2012 (of 17 unique complaints queried, NHTSA complaints API by model year, queried 2026-10-21; keywords: oil consumption, burning oil, smoke, engine failure, bore, scoring, IMS, intermediate shaft, knock, tick) (NHTSA returned no complaint data for 1 model-year queries). This counts complaints that mention these words. It is not a defect finding.

What owners report

• In My Cayman is definitely bore scored, now what? on Rennlist, a 160,000-mile 987 Cayman S owner had a cold-start tick that grew, oxygen sensor codes and smoke on cold starts, though the car still ran strong. Members said piston slap is a classic sign, that it won't cure itself and will get worse, and recommended a borescope. They debated sleeves versus a replacement engine and said costs can exceed the car's value.
• In Seriously, how serious are bore scoring and IMS issues on Rennlist, a shopper asked how likely these problems are. Members and a parts specialist said base 987.1 Caymans don't have bore scoring issues, Cayman S models can at any mileage, and to borescope the cylinders through the oil pan before buying. They said the 2006–2008 IMS bearing has a low failure rate and that regular oil changes and avoiding short trips help.

Quick tip

Don't buy a 987 Cayman S without a borescope through the sump. It's the cheapest insurance you'll ever buy on a Porsche.

Vehicle focus: 2006–2012 Porsche Cayman (987), mainly the 3.4L Cayman S. Base 2.7L 2006–2008 cars rarely see bore scoring.

Safety / mechanic note

A badly scored engine can fail and shed metal. Verify with a mechanic.