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Leeb
New User
Nov 13, 2012, 3:44 PM
Post #1 of 7
(1582 views)
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2000 Chevy Blazer won't start but sounds like it wants to and at times it feels like it is gonna start. I have replaced the battery,starter,starter relay,distributor, spark plugs, crankshaft sensor, starter coil. It has about 150k miles and is a V6 4 wh/drive. Any ideas...lol
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Hammer Time
Ultimate Carjunky
/ Moderator
Nov 13, 2012, 3:54 PM
Post #2 of 7
(1574 views)
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Stop just throwing parts at it and diagnose it correctly. Don't skip any steps.
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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Discretesignals
Ultimate Carjunky
/ Moderator
Nov 13, 2012, 4:22 PM
Post #3 of 7
(1560 views)
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Too add to that, is the security light on or blinking while your cranking the engine?
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Nov 13, 2012, 4:24 PM)
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Leeb
New User
Nov 15, 2012, 10:14 AM
Post #4 of 7
(1518 views)
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Ok, I have done all of that and everything passed. I have put fuel and starter fluid in the carb and it still wont start. Any other ideas or should I just put it down..lol
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Hammer Time
Ultimate Carjunky
/ Moderator
Nov 15, 2012, 11:27 AM
Post #5 of 7
(1513 views)
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Then you didn't pass all those tests because the car would be running if you had.
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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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Discretesignals
Ultimate Carjunky
/ Moderator
Nov 15, 2012, 11:36 AM
Post #6 of 7
(1510 views)
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What was the fuel pressure?
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Hammer Time
Ultimate Carjunky
/ Moderator
Nov 15, 2012, 12:59 PM
Post #7 of 7
(1506 views)
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You know the answer to that question already...............
"Plenty, I couldn't hold it back with my finger"
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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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