Skip the auto shop - Our mechanics make house calls

Q: Slow start up on a Mazda RX-8

asked by on

I have a Mazda RX-8, 231 brake horsepower rotary. When I turn it over, it takes ages to start up. I changed the battery but it didn't resolve the problem. When it's running, it doesn't have an issue, it is fine. Should I be looking at the starter?

You say it starts. If it cranks normally then it is not the starter. But if it turns to a normal speed and it starts out driving normal, with a continuous rapid starting sound then that means the starter is okay.

But now, if it has a slow, unusual starting sound, then either the battery is weak or the starter is starting to wear out. But, if it cranks at a normal speed, those rotary engines are notorious for their Apex seals.

They don’t have piston rings because they are not piston engines. They’ve got these three Apex seals on each corner of the triangular rotor and they will lose compression and be harder to start as they age. So, do a compression test first. You might see that the engine is starting to wear. I see that a lot.

Of course, tuning it up would also be helpful in this case. Put new spark plugs, a new air filter, and a new fuel filter to make sure it is tuned up right. But, if it still does it, a lot of times it is just a worn-out engine on that model.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. Slow start up on a Mazda RX-8

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: New alternator works fine. Test is fine but battery light in dash is still on. How come?

Hello there, the battery light on your 2004 Toyota Tundra is there to warn you that the alternator output is out of specifications. If the alternator output is to low or high, the light will be on. The alternator output...

Q: Car starts on its own. Just changed the starter, the solenoid is okay, and I checked the wiring.

Hello. Either the two big terminals are touching each other on the starter solenoid or the starter solenoid is shorted internally. You should check to make sure the two large terminals are not touching. If you would like to have...

Q: the automatic transmission will not go in gear shifter moves but seems like it's in neutral

Hello. If the transmission is not going into gear and is behaving as if it were in neutral, then it may be possible that there is an issue with the transmission. A transmission that will not properly engage may be...

Related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.