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gofish727
Novice
Jun 28, 2012, 11:23 AM
Post #1 of 11
(1814 views)
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1995 dodge dakota 4 cylinder. While driving, truck stopped, just like I turned off the key. Engine will crank but wont fire. this happened one other time, but started back up 10 minutes latter with no further trouble till now. Thanks for any and all advice and commentes
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jun 28, 2012, 12:08 PM
Post #2 of 11
(1793 views)
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Re: ignition system
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Probably lacking spark, fuel delivery or fuel pressure. You'll need to catch it not starting and see if either of the two is missing or low fuel pressure,
T
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gofish727
Novice
Jun 28, 2012, 12:45 PM
Post #3 of 11
(1776 views)
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Re: ignition system
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thanks for the imput. fuel is fine. definatly a spark problem.i dont get 12 volts to the coil, but i wonder if it could be it the ignition. the ignition sw. has given me other probs!!
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 28, 2012, 1:30 PM
Post #4 of 11
(1764 views)
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Re: ignition system
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Here is the complete test sequence. You need to perform all of the tests and post the results.
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.
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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gofish727
Novice
Jun 28, 2012, 2:07 PM
Post #5 of 11
(1749 views)
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Re: ignition system
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there is no power at the positive side of the coil with the key on
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gofish727
Novice
Jun 28, 2012, 2:12 PM
Post #6 of 11
(1747 views)
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Re: ignition system
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i did run 12 volts to the positive side of the coil but it still didnt fire
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 28, 2012, 2:55 PM
Post #7 of 11
(1734 views)
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Re: ignition system
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You need to finish the testing. i need to know what else has issues and what they are.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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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Sidom
Veteran
/ Moderator
Jun 28, 2012, 3:13 PM
Post #8 of 11
(1728 views)
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Re: ignition system
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In addition to the other tests. How are you testing for power? And test for power at the coil while someone cranks the engine and see what you have.....
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gofish727
Novice
Jun 28, 2012, 4:05 PM
Post #9 of 11
(1718 views)
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Re: ignition system
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I tested for power at the coil by pulling the coil wire out of the distributor and testing at that point with a meter. while cranking the motor ,it showed 12.7 volts
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re-tired
Veteran
/ Moderator
Jun 28, 2012, 6:40 PM
Post #10 of 11
(1700 views)
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Re: ignition system
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That test shows a definite need to have vehicle towed to a shop.
LIFE'S SHORT GO FISH
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