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1990 mazda stalls after 15-30 min
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ekandefer
New User
Sep 28, 2009, 2:23 PM
Post #1 of 2
(1275 views)
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1990 mazda stalls after 15-30 min
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1990 mazda b2200 pickup after 15 to 30 min of running the engine quits then in about 10 to 15 min it runs fine. I crank the engine but it just cranks and cranks I checked to see if it had spark. I checked at the coil wire then plug 1 spark was good I removed the gas line to the fuel injection system and pumped gas into a bottle and it pumped as the engine cranked put the hose back on still would not start then I wait 10-15 min starts right up runs very smooth and has a lot of power new plugs new wires new fuel filter.
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Hammer Time
Ultimate Carjunky
/ Moderator
Sep 28, 2009, 2:54 PM
Post #2 of 2
(1272 views)
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Re: 1990 mazda stalls after 15-30 min
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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 test 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 previous tests pass, perform a complete compression test and record the results. All cylinders should be over 120lbs in most cases and all be within 10% of each other.
Once you have determined which of these functions has dropped out,
you will know which system is having the problem.
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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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