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1999 Mazda protoge shuts off after driving awhile

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New User

Mar 22, 2013, 6:56 AM

Post #1 of 2 (1270 views)
post icon 1999 Mazda protoge shuts off after driving awhile Sign In

My 1999 Mazda Protege starts fine after driving for awhile it shuts off and I have to let it cool awhile for it to start again, its not the radiator no spilled water, fan working good Car doesn't show overheating, but something is overheating because it drives better on cold day. Already change Starter, Put new catalyctic converter. What could it be?

Hammer Time
Ultimate Carjunky / Moderator
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Mar 22, 2013, 7:17 AM

Post #2 of 2 (1258 views)
Re: 1999 Mazda protoge shuts off after driving awhile Sign In

  All "crank, no start" conditions are approached in the same way. Every engine requires certain functions to be able to run. Some of these functions rely on specific components to work and some components are part of more than one function so it is important to see the whole picture to be able to conclude anything about what may have failed. Also, these functions can ONLY be tested during the failure. Any other time and they will simply test good because the problem isn't present at the moment.
If you approach this in any other way, you are merely guessing and that only serves to replace unnecessary parts and wastes money.

Every engine requires spark, fuel and compression to run. That's what we have to look for.

These are the basics that need to be tested and will give us the info required to isolate a cause.

1) Test for spark at the plug end of the wire using a spark tester. If none found, check for power supply on the + terminal of the coil with the key on.

2) Test for injector pulse using a small bulb called a noid light. If none found, check for power supply at one side of the injector with the key on.

3) Use a fuel pressure gauge to test for correct fuel pressure, also noticing if the pressure holds when key is shut off.

4) If all of these things check good, then you would need to do a complete compression test.

Once you have determined which of these functions has dropped out,
you will know which system is having the problem.


We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

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