1999 miata keeps dying issue???

[slammedyatta]

I have a 99 miata and its sometimes hard to start, yesterday it died at a stop light and wouldn't stay running after that. Tried driving it home and every time I let it get down to idle speed it would just die, is this is a fuel filter issue or a can sensor issue?

[BoBo]

It could also be dirty egr or vacuum leak due to stale hoses around the intake manifold.

[slammedyatta]

All the hoses are like brand new so dont thnk its that, whheres the egr located? Back towards firewall correct?

[BoBo]

Yeah, at-least mine is located on the intake manifold near the firewall. You could just clean it with a q-tip and some solvent, but before you do all of that try a bottle of Techron fuel system cleaner if you can still manage to drive the car. It might just be a dirty injector assuming your spark-plugs & wires are in decent condition. When was the last time you replaced the fuel filter? hows your fuel pressure regulator doing?

[slammedyatta]

Update: car started and ran fine, drove it to oreilleys up the road and scanned it and got a "p0134" code. Code definition: Heated Oxygen sensor (bank 1 sensor 1) lack of activity, I'm assuming its a o2 sensor?

[— Phatmiata —]

Sounds like it.

[BoBo]

I'm surprised a cel didn't pop up at the dash before you had it scanned for codes, but at least you found the problem. I recently replaced my 02 and my gas efficiency improved I'm sure yours will too.