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Bronco1979
New User
Jan 11, 2015, 11:23 AM
Post #1 of 2
(1077 views)
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engine will not run
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Ok here it is lets see if anyone else has ever had this problem. 1995 Geo Prizm with 1.6l. Car was being driven and the engine just stop running all is a sudden. Checked timing and it is good. Replaced fuel pump. And checked fuses and relays they are good. When you turn the key to the run position the fuel pump does not run. When you turn the key to start it the engine turns over fine and than when you let go of the key and it returns to the run position than the fuel pump runs a few seseconds. Also I can jump in the test connector and the pump does run. Any ideas? I'm stumped.
(This post was edited by Bronco1979 on Jan 11, 2015, 12:57 PM)
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Hammer Time
Ultimate Carjunky
/ Moderator
Jan 11, 2015, 11:50 AM
Post #2 of 2
(1066 views)
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Re: engine will not run
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We don't diagnose cars by what we may have seen in another car. The car needs to be systematically tested to isolate the issue.
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.
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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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