Honda's J30A is also of all-aluminum construction using single overhead cams with four valves per cylinder and VTEC variable valve timing. Usually, this is a dependable engine, but a few J30 V6 engine problems include a clogged exhaust-gas recirculation (EGR) valve and electrical problems such as a weak alternator and alternator fuse. You can also expect high oil consumption and oil leaks to occur.
A clogged EGR valve or throttle-body problems in the 2003 to 2007 Honda Accord will result in acceleration problems, a decline in engine performance, and fuel-consumption and emissions problems. If any of these issues occur, you will need to have the part cleaned. You may also experience problems with the gas cap and refueling/pumping gas, calling for a new gas cap.
The J30A's alternator is known to fail sooner than is usual. Common symptoms include starting failure despite a long driving distance to charge the battery, a whining noise when trying to start, stalling, and a battery warning-light problem at startup. If any of these happen, you will need to have the alternator replaced.
As the J30A covers distance, it may start to develop oil leaks. It may also start to consume oil but it will likely not be in excessive amounts. If this starts to happen, it might be because of a stuck PCV valve. As a result of this, you can expect dirty spark plugs, low oil levels, and a smoking exhaust. Generally, high oil consumption and oil leaks can be delayed with routine maintenance, including frequent engine oil changes and PCV-valve services.
Like the Accord's K24A, the J30A does not employ hydraulic lifters for the valves. It also features a timing belt. The valve clearances need to be checked at 30,000-mile intervals and adjusted if they're noisy. You should also replace the belt and water pump at 60,000 miles. Make sure that the water pump is routinely inspected. Seeing that it runs on the car's timing belt, its failure will cause major damage to the engine.
Mileage: The EGR and PCV valves are likely to start getting clogged at around 120,000 miles. Alternator failure can start as soon as 100,000 miles.
Cost: Having the EGR valve cleaned out should cost about $100. A new alternator may cost about $780. Replacing a dirty or worn PCV valve may cost around $150.
How to spot: A dirty EGR valve will result in poor acceleration, a decline in engine performance, and bad fuel consumption. A bad alternator will lead to a flat battery and the car not being able to start, a whining noise when trying to start the car, the engine stalling, and a battery warning light.