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1996 Chevy Blazer Fuel Injector Solenoid

Tiny
BURNING
  • MEMBER
  • 1996 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 200,000 MILES
I have a 96 Chev Blazer. I have replaced the fuel injector spiders 4 times in the last year and a half. When I put a new or tested used into truck it runs great for 2 to 8 months and then fails again. I have checked the fuel tank and fuel return line they look fine. What could be causing the fuel injector solenoid to fail? I do not receive any ODBii codes.
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Wednesday, December 10th, 2008 AT 3:06 PM

8 Replies

Tiny
JAMES W.
  • MECHANIC
  • 2,394 POSTS
Is it the same injector(s) all the time or a specific one? Also, I'm not sure what you mean by "spiders". And, are the injectors plugged or the coils burned out Please advise.
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Wednesday, December 10th, 2008 AT 3:39 PM
Tiny
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Gas goes to a single solenoid and then goes to six lines that go to injectors (it looks like a spider.)
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Wednesday, December 10th, 2008 AT 6:48 PM
Tiny
JAMES W.
  • MECHANIC
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I've only heard that term used on diesels, now I know. Anyway, you didn't give me the info on the the injector(s). Please advise.
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Wednesday, December 10th, 2008 AT 7:39 PM
Tiny
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  • 5 POSTS
The gas goes from fuel pump to the fuel injector / fuel regulator which has a solenoid on the assembly (spider) which is failing. The resistance on the solenoid goes from about 1.5 ohms to 30,000 ohms. The fuel injector nozzles check out fine.
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Wednesday, December 10th, 2008 AT 8:17 PM
Tiny
JAMES W.
  • MECHANIC
  • 2,394 POSTS
This may sound like a stupid question, but how can the resistance go from 1.5 ohms to 30,000? I have pondered over several diagrams and what you seem to be testing is a fuel pump/oil pressure cutout switch. How many wires go to this unit? If my diagram is correct, this switch will shut off the fuel if oil pressure drops beyond a certain point.
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Wednesday, December 10th, 2008 AT 11:07 PM
Tiny
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I am not testing fuel pump, the spider is isolated from electric circuit when it is tested with an ohm meter.
Back to the original point, what can be making the solenoid on the the spider fail. There is no restrictions on the fuel flow and the fuel pressure is at 60psi, so it must be in the electrical circuit. I'm not sure where to start looking. A dealer tried replacing the computer but that made no difference.
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Thursday, December 11th, 2008 AT 9:31 AM
Tiny
SWILLIAMS
  • MECHANIC
  • 597 POSTS
Burning,
Have you checked to voltage and grounds going to the spider? You may have a bad harness.

Check the harness for any worn through insulation as well. Because the system actually uses ground switching a grounded wire could be causing high current, also shorting out the coils

Also, where have you been buying the replacements?
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Thursday, December 11th, 2008 AT 10:07 PM
Tiny
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Thanks SWilliams for the direction. I will investigate.
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Thursday, December 11th, 2008 AT 10:32 PM

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