OTC6521 Smoke Machine – Smoking Recommended

car smoke dollar 2

The OTC6521 smoke machine for EVAP testing is the best tool I’ve seen for checking trouble codes like P0440, P0442, P0455, P0456 and P0457 that can be caused by evaporative system leaks. Diagnosing an evaporative code is no fun without this tool. Leaks are the leading cause of EVAP codes, many times it’s just a loose gas cap. But if it’s not the fuel cap the OTC 6521 will provide a quick easy way to find the leak.

Other Uses

Vacuum leaks can also be traced easily with the OTC 6521 smoke machine. Engine codes for lean conditions like P0172 and P0174 are usually because of a vacuum leak. If the vacuum leak isn’t an obvious one, then a quick smoke test with the OTC6521 smoke machine will make finding it much easier. I remove a random vacuum line and block off the air intake hose, fill with smoke and see where it comes out.

The OTC 6521