Question about 1999 Mazda MX-5 Miata

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Location of ecm on 1999 mazda miata - 1999 Mazda MX-5 Miata

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Posted on Jan 02, 2017

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SOURCE: Miata has 61000 miles want replace timing belt to be on safe side

California has a law that Mazda guarantees the timing belt will last 105,000. I drove my 1999 Miata that long before I replaced it. Mazda ia a non interactive motor which means that if the belt breaks the car stalls and won't go anywhere. No damage to engine if it breaks.

Posted on Apr 01, 2009

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SOURCE: Location O2 sensor after cat for Mazda Miata 2002

Just had BOTH of my O2 sensors replaced in my 2002 Miata.  The sensors are located
1. at the back of the engine compartment look down (on the passenger side ) You should see a spark plug looking device near the bottom of the engine (on the side) it has a short wire output that goes to a connector looking device on the other end. This O2 sensor had a short wire connector on the other end
Probably can be replaced from the top.
2.  This one is tougher --- From underneath the vehicle just after the catalytic converter  you should be able to see the Spark plug like O2 sensor .  The person who repaired it for me had to trace the wire from the O2 sensor.  It goes up into ( perhaps the frame or bottom of the vehicle INTO the Driver compartment under the drivers seat.  It is located near the Center Console  right at the carpet seam. It was about in a straight line from the BACK of the Drivers side Car Door.  He felt around -- and located the Connector (under the carpet near the center console. .  He checked underneath the car to the point where the wire disappeared --to confirm he had the correct wire.  
Once he located where the sensor wire led to --He had the old sensor out and wire connector disconnected and a  New sensor and the connector installed in about 10 minutes.  
The O2 sensor for this one was much longer than the first O2 sensor in the engine compartment He had to use some sort of standard release spray on the old sensor itself --to remove the old O2 Sensor.   Since it is exposed to the elements under the car.   Wrench, I think a screwdriver  and the spray were all the tools I remember him using.....

The autozone code indicated only the engine compartment sensor was bad.
The repair man told me Both usually go bad at the same time.  
I fixed the first one only -- turned out the warning light lit up a day or so later indicating the second O2 Sensor under the vehicle was bad.  Fixed that as well -- have had no problems since -- repair was about 4 months ago.....

Posted on May 24, 2009

  • 36 Answers

SOURCE: Mazda Miata 2001 car problem

Batteries can have a dead cell in them, meaning there is sufficient charge to run accessories and the "check glass" may look fine (dark green in color on maintenance free batteries), but one dead cell in the battery indicates replacement time.

Posted on Aug 14, 2009

  • 107 Answers

SOURCE: 1999 mx-5 mazda miata- turns

Check your diagnostics in case they can reveal something...

If you're driving an American model WITH a check engine light on the dash, put a paper clip between terminal 10 and GND in your diagnostic box (right side of the engine bay near the air intake - has a big DIAGNOSTIC written on it). Then hop into your car, turn the key to ON (but don't start the engine). The light should go on steady - then off for 4 seconds. After this any diagnostic codes will be displayed. Long flashes are for the first digit in a two digit code - short flashes are the second digit. There will be a 4 second pause between each code AND the codes will repeat. If you get codes, record them and post them and I'll see what I can suggest.

Otherwise, check your spark plugs and wires - replace them if necessary - check the coil packs and the connections thoroughly. Poor or no ignition is most likely your problem.

Also check your air intake, filter and check and clean your throttle body.

I'm betting you'll find an issue in the ignition system though.

Hope this helps,
Sherwin

Posted on Dec 13, 2009

SOURCE: 1999 mazda miata check engine

The CEL is an overall warning that something is not quite right. The ECU has received a signal that some aspect of the engine operation went outside normal parameters. Do a check on engine oil and transmission fluid levels. Make sure that the air ducting and vacuum lines to the inlet manifold are all good and leak free. If there is something obvious then fix it. If everything appears OK but you are still worried have a garage read the On Board Diagnostics and see what temporary error was logged.

Posted on Aug 18, 2010

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