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paulrice
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Nov 8, 2009, 6:22 AM
Post #1 of 9
(5985 views)
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1996 chevy astro van
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wont start check no spark changed cap,rotor,coil,module,crank sensor still no spark,have power at coil before problem truck was running fine then spudded and died
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Hammer Time
Ultimate Carjunky
/ Moderator
Nov 8, 2009, 7:46 AM
Post #2 of 9
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Re: 1996 chevy astro van
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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 other tests are passed. then 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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paulrice
User
Nov 8, 2009, 8:12 AM
Post #3 of 9
(5960 views)
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Re: 1996 chevy astro van
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i am getting fuel,i am not getting spark i have power at the coil i check spark at the spark plug wire and coil nothing
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Hammer Time
Ultimate Carjunky
/ Moderator
Nov 8, 2009, 8:22 AM
Post #4 of 9
(5956 views)
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Re: 1996 chevy astro van
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How did you determine you have fuel?
Are the plugs fouling?
Have you tested compression?
Have you verified that the distributor is actually turning?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.
(This post was edited by Hammer Time on Nov 8, 2009, 8:24 AM)
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paulrice
User
Nov 8, 2009, 8:27 AM
Post #5 of 9
(5951 views)
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Re: 1996 chevy astro van
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i check by thefuel rail for fuel have fuel no spark at plugsor wires
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Hammer Time
Ultimate Carjunky
/ Moderator
Nov 8, 2009, 8:29 AM
Post #6 of 9
(5947 views)
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Re: 1996 chevy astro van
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Are you ignoring the other things I asked?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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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paulrice
User
Nov 8, 2009, 8:31 AM
Post #7 of 9
(5944 views)
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Re: 1996 chevy astro van
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the dist is turning
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paulrice
User
Nov 8, 2009, 12:39 PM
Post #8 of 9
(5922 views)
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Re: 1996 chevy astro van
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the dist is turning,the plugs are good but wont start no spark pulled wire on plug no spark
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Loren Champlain Sr
Veteran
/ Moderator
Nov 8, 2009, 4:52 PM
Post #9 of 9
(5918 views)
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Re: 1996 chevy astro van
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Paul; HT's list is the correct way to determine the cause. Was this running fine before it sputtered and died? How did the distributor cap and rotor look? You did remember to reinstall the rotor, right? Firing order correct? Fuel pressure needs to be around 55psi for this Vortec to fire. We can't be of much help until we get the results of the tests that have been made. Any trouble codes stored?
Loren
SW Washington
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