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1987 k5 Blazer wont start.

  #1  
Old 07-07-2011, 11:10 AM
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Default 1987 k5 blazer wont start

It ran fine, and have been driving it arund with no issues. I parked it and the next day it wouldn't start, cranks over fine, but I noticed I'm not getting any fuel out the injectors. Its a 350 TBI, can hear fuel pump (pump is only a year old and is an AC Delco pump), checked filter it isn't clogged, have fuel at the throttle body, any there is power going to the injectors. Anyone have any other ideas what it could be?
 

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  #2  
Old 07-07-2011, 11:22 AM
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Have you tested the injector harness with a noid light? This light, when fitted into the injector harness will blink in relation to the command from the PCM to open/close the injector which is accomplished through pulsed grounds to the injector.

Also, you need to have ~10psi of fuel pressure at the throttle body. Have you tested the actual pressure?
 
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Old 07-07-2011, 11:29 AM
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Don't have a fuel pressure tester, and no haven't tested with a noid light yet
 
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Old 07-07-2011, 11:38 AM
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Just checked injectors with a homemade noid light (194 bulb and a couple wires) the bulb didn't light up.
 
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Old 07-07-2011, 11:47 AM
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The pulse may not be long enough to put any kind of temperature into the filament of a 194 bulb. Sounds like it's time to invest in some new tools.
 
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Old 07-07-2011, 12:01 PM
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I would but I'm broke until payday so I'm making use of what I got, and I've used 194 bulbs before and tey worked.
 
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Old 07-07-2011, 01:35 PM
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You wouldn't happen to know what the resistances should be?
 
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Old 07-07-2011, 01:42 PM
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the best way to check is with a fuel pressure tester . you can always borrow one at your local auto parts if they have a loan a tool service
 
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Old 07-07-2011, 03:10 PM
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I seriously doubt its a fuel pressure issue but thanks.
 
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Old 07-07-2011, 06:16 PM
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Thanks for all your help but I got it figured out. Took me a long time to find the specs I was looking for. It was a bad ignition module and pickup coil. A signal goes from the ignition module to tell the ECM when to pulse the injectors which is why I had no fuel.
 
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