Turns over will not start

Tiny
CARLA GREGGBARFIELD
  • MEMBER
  • 1993 MAZDA MIATA
  • 1.6L
  • 4 CYL
  • 2WD
  • MANUAL
  • 155,000 MILES
Cranks but will not start. I have replaced and has new fuel pump, new spark plugs, new fuel filter and still have same problem.
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Saturday, June 17th, 2017 AT 8:43 PM

3 Replies

Tiny
HEYMAN1104
  • EXPERT
First off, was the fuel system primed after replacing the pump? If so, then try spraying some starting fluid into the intake and then crank it. If it starts and then shuts off, you have a fuel delivery problem. If not, then you probably have an issue with the sparks (weak, non-existent, or not on time). Let us know and we will go from there.
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Sunday, June 18th, 2017 AT 5:14 AM
Tiny
CARLA GREGGBARFIELD
  • MEMBER
Dug more into my car. Found ignition switch had burn marks, replaced it and started right up. Still doesn't want to idle and stay running at sit still. Drained old gas and replaced with new. Did a test drive and it runs great. Still wants to shut off during low idle. Any ideas?
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Thursday, June 22nd, 2017 AT 6:04 PM
Tiny
HEYMAN1104
  • EXPERT
Rough idle on this car can be caused by a lot of things. Spark plugs, plug wires, coil/distributor, fuel filter, PCV valve (a $5 part, takes about 30 seconds to change), and even just cracked vacuum lines.

Since you've already done the plugs, start with the vacuum lines (free to check, dirt cheap to replace), then look at the PCV valve, then look at the plug wires (if you haven't already). After that, it probably wouldn't hurt to take the distributor cap off and look at the rotor and contacts around the cap (clean them off if they have any white looking corrosion).

-How to find vacuum leaks- https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Let us know what you find.
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Thursday, June 22nd, 2017 AT 7:23 PM

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