S10 spider injector
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  1. #1
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    Jun 2012
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    S10 spider injector

    I picked this up for 850 on Craigslist

    Anybody have experience replacing the spider injector on the 4.3? It's dumping fuel like crazy, I'm getting 11 or 12 mpg


  2. #2
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    Feb 2014
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    n.w. of chicago
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    Re: S10 spider injector

    Quote Originally Posted by MetalMan23 View Post
    I picked this up for 850 on Craigslist

    Anybody have experience replacing the spider injector on the 4.3? It's dumping fuel like crazy, I'm getting 11 or 12 mpg

    Are you sure that's the problem, injectors usually don't dump on there own, truck looks clean

  3. #3
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    Re: S10 spider injector

    Quote Originally Posted by pat h View Post
    Are you sure that's the problem, injectors usually don't dump on there own, truck looks clean
    Fairly certain

    #1 it's only getting 11-12mpg, these get 17-18 easy, I've had a few so I know the range.

    #2 there's a long crank to start problem, I checked the fuel pressure with a gauge, when the key is turned to the on position, the pressure goes to 60psi, normal. Then it bleeds back down to around 20-30psi which would cause the long cranking to start,

    So there's 2 common causes of this, a bad check valve in the tank, or leaking injectors

    #3 the smog pump is running overtime, it can be heard running on startup, and at times during driving, seemingly more often at low rpms, the smog pump (or secondary air injection system) injects air into the exhaust when the system senses an excess of unburnt fuel.


    So considering all these factors I'm making an educated guess that the injectors need to be cleaned /replaced, the cleaning route may be cheaper but I don't have the downtime to do that,


    Overall, not a bad score for 850

  4. #4
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    Re: S10 spider injector

    Over size tires can also play a part in poor mpg. have you plugged the sniffer in the tail pipe to see what the readings are?
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  5. #5
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    Re: S10 spider injector

    Quote Originally Posted by N2 Welding View Post
    Over size tires can also play a part in poor mpg. have you plugged the sniffer in the tail pipe to see what the readings are?
    I don't think they'd make a massive difference like that, I don't have a "sniffer"

  6. #6
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    Re: S10 spider injector

    no smog stations you can get a pre smog check for like $10-$20 ?
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  7. #7
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    Re: S10 spider injector

    Not in CT

  8. #8
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    Re: S10 spider injector

    CT should have some repair shops equipped with smog analyzers no? How do they know the vehicle is running as it should if they don't have a way to analyze the exhaust.
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  9. #9
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    Re: S10 spider injector

    CT should have some repair shops equipped with smog analyzers no? How do they know the vehicle is running as it should if they don't have a way to analyze the exhaust. OK quick dirty easy way to tell if you are burning too much fuel. Does the exhaust smell like raw fuel is not being burned up?
    Lincoln, ESAB, Thermal Dynamics, Victor, L-tec, Miller, Dewalt, Makita, Kalamzoo. Hand tools, power tools, welding and cutting tools.

  10. #10
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    Re: S10 spider injector

    Yes. .

  11. #11
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    Re: S10 spider injector

    I don't need to diagnose it, I was just wondering if anyone has experience doing the injector

  12. #12
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    Lockhart,Tx (BBQ capitol of the world)
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    Re: S10 spider injector

    I know you don't need help diagnosing it BUT, an engine running that rich should be throwing an oxygen sensor code.
    If it is not I'd be suspicious of one or more bad oxygen sensors.
    Sorry I can't help you with the injector.

  13. #13
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    Re: S10 spider injector

    Quote Originally Posted by rexcormack View Post
    I know you don't need help diagnosing it BUT, an engine running that rich should be throwing an oxygen sensor code.
    If it is not I'd be suspicious of one or more bad oxygen sensors.
    Sorry I can't help you with the injector.
    I was wondering why it wasn't, although I haven't read the codes in a while

  14. #14
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    Re: S10 spider injector

    Had to google "S10 spider injector". I'm not a Chevy guy so I'd never heard of it.
    I can see why you would arrive at that conclusion!
    Do they all fail?
    Last edited by rexcormack; 01-10-2019 at 09:23 PM.

  15. #15
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    Re: S10 spider injector

    It can't be a spider, it needs 2 more legs.
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  16. #16
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    Re: S10 spider injector

    I don't have any experience on it but this guy does: https://www.instructables.com/id/Poo...Vortec-Fuel-I/
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  17. #17
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    Re: S10 spider injector

    Quote Originally Posted by CAVEMANN View Post
    It can't be a spider, it needs 2 more legs.
    Shoot, well I would be a spider if it was a V8

  18. #18
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    Re: S10 spider injector

    Quote Originally Posted by bigb View Post
    I don't have any experience on it but this guy does: https://www.instructables.com/id/Poo...Vortec-Fuel-I/
    I read that article, I was thinking of trying that. For less than $50 sounds like a good idea, but I don't want to go through all that trouble and put it back together and find out it's still dumping fuel

  19. #19
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    Re: S10 spider injector

    It's a fairly easy job. You have to pull the upper intake manifold cover to get to them. IIRC, you don't have to drain the coolant or do anything complicated. There is an upgrade kit that uses electric injectors instead of the OEM popet style.

    When I did mine gm parts direct had the best price on the kit. I think it was about $350.

    The popet injectors were problematic. You should be averaging close to 20 mpg on fairly flat ground. When I was driving my s10 loaded down in the hills with a ladder rack I was getting about 15.

    Sent from my SM-T837V using Tapatalk

  20. #20
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    Re: S10 spider injector

    Quote Originally Posted by WTXBTUMOVER View Post
    It's a fairly easy job. You have to pull the upper intake manifold cover to get to them. IIRC, you don't have to drain the coolant or do anything complicated. There is an upgrade kit that uses electric injectors instead of the OEM popet style.

    When I did mine gm parts direct had the best price on the kit. I think it was about $350.

    The popet injectors were problematic. You should be averaging close to 20 mpg on fairly flat ground. When I was driving my s10 loaded down in the hills with a ladder rack I was getting about 15.

    Sent from my SM-T837V using Tapatalk
    I know they sell It upgraded version without the puppet injectors, but I have not been able to find a part number for that online, all I see is OEM Style

  21. #21
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    Re: S10 spider injector

    ACDelco 217-3028

    https://www.amazon.com/ACDelco-217-3...ywords=2173028

    Sent from my SM-T837V using Tapatalk

  22. #22
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    Re: S10 spider injector

    And that's a nice little truck, especially for that price. I wish I still had mine. It was a fun truck, but I needed something bigger, so had to trade it.

    Sent from my SM-T837V using Tapatalk

  23. #23
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    Re: S10 spider injector

    Ya Phil, 850.00 sounds kind of steep. As said above it is like R/R an intake manifold.
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  24. #24
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    Re: S10 spider injector

    I put the updated version on my v8 and have at least 100,000mi on it. No problems.
    Be sure to replace the fuel pressure regulator while you are in the intake. They do leak eventually and cause the same problems.
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  25. #25
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    Re: S10 spider injector

    Quote Originally Posted by propanehotrod View Post
    I put the updated version on my v8 and have at least 100,000mi on it. No problems.
    Be sure to replace the fuel pressure regulator while you are in the intake. They do leak eventually and cause the same problems.
    Maybe I should try that first, it's cheaper

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