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Injector Spider ?

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Old 01-15-2013, 11:03 AM   #1
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Injector Spider ?

My blazer ('96 4.3L) has been starting rough lately. It's not an electrical issue, rather a fuel problem. When I turn the ignition, the engine "shakes" and "chugs" to start. I've recently had a new fuel pump put in and the fuel filter is new as well. I work part-time at a Dodge dealership and I had one of the mechanics take a quick look the other day and he says the EGR is in good shape and the fuel lines are good as well. The fuel pressure looks normal also. He ran a few tests and said the problem is most likely a leaking "injector spider" but recommended I take it to a Chevy dealer to know for sure. He said that the hard start is due to air leaking in and I'm basically "priming" the engine each time I start it. I do have a mechanic friend that usually does work for me and he can replace this but I wanted to make sure this sounds correct. Also, exactly what part am I looking for here? I did look online but wanted to make sure I have the correct part.
Old 01-15-2013, 02:17 PM   #2
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Re: Injector Spider ?

What brand of pump was installed?
What was the fuel pressure readings and did pressure hold?
Should be 60-66psi key on engine off and not drop below 55psi after 10 minutes. If pressure drops to zero right away then the FPR is leaking. If pressure drops slow then injector(s) are leaking.

How to visually look for leaking:
http://troubleshootmyvehicle.com/gmc...owall=&start=2

Any CEL codes? Is the ECT reading correctly? Have you looked at fuel trims?

If your looking to change the injectors, you would be looking for the
Delphi FJ10565 Fuel Injector Spider

Old 01-16-2013, 10:59 AM   #3
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Re: Injector Spider ?

I'm not 100% sure on the answers to those questions. I'm going to take it to my mechanic next week along with the print-outs from the link you sent and go from there...The local Chevy dealer wants $85 an hour and over $400 for the part so I'm gonna take it to my usual guy that helps me out and let him work on it. He was a Ford mechanic for over 10 years so he knows what he's doing, but obviously the labor is much cheaper!
Old 01-16-2013, 03:56 PM   #4
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Re: Injector Spider ?

On the Delphi link you provided, does that include the pressure regulator as well? I called some local parts places and they're running $340 - $400 for the spider injector with the pressure regulator.
Old 01-16-2013, 10:11 PM   #5
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Re: Injector Spider ?

Quote: Originally Posted by rydin4life
On the Delphi link you provided, does that include the pressure regulator as well? I called some local parts places and they're running $340 - $400 for the spider injector with the pressure regulator.
Yes the FPR is included.
Delphi FJ10565 Fuel Injector : Amazon.com : Automotive Delphi FJ10565 Fuel Injector : Amazon.com : Automotive
Old 01-17-2013, 11:11 AM   #6
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Re: Injector Spider ?

Thanks...Amazon definitely has the better price..probably go with that one. I noticed it looks different than this one I found on eBay...were there different styles?

http://www.ebay.com/itm/Central-Port...60536901162%26
Old 01-17-2013, 12:50 PM   #7
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Re: Injector Spider ?

Hey man, I have a 4.3 I just toil out of my truck. Ran good except and bottom end knock. I'd sell you the intake, spider injectors and all for 150 . I'm in south central pa also so I could probably meet you with it
Old 01-17-2013, 01:06 PM   #8
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Re: Injector Spider ?

A few more questions...
Will I need the additional bracket that Amazon sells or does the unit come with it? Also..any other parts I'll need (intake gaskets, etc.)?

I'd also like to put new O2 sensors in...there are 4 on that engine, correct? Do you have part numbers for them?



Noob....let me think about that one!!
Old 01-17-2013, 03:23 PM   #9
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Re: Injector Spider ?

the bracket is sold separately.
but you can use the old bracket if you want.
the new one is a better, easier to use design though.
Old 01-17-2013, 07:11 PM   #10
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Re: Injector Spider ?

I'd probably just buy the bracket...only like $15. If I go this route, anything else needed besides the unit itself, bracket, and upper intake gasket? (Any gasket recommendations by the way?)
Old 01-17-2013, 08:00 PM   #11
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Re: Injector Spider ?

I've replaced my intake gaskets a couple years ago.
so I didn't bother replacing the upper gaskets when I
installed my modded 06 MFI injectors a couple weeks ago.
they actually are reusable up to a point.

ive even seen a friend reuse 10 year old upper gaskets,
without any leaks...
not recommending that. just sayin...
Old 01-17-2013, 08:01 PM   #12
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Re: Injector Spider ?

Right on! What's the difference between the old style injectors and the new ones? Why is this "conversion" necessary and are all the currently available units like this?
Old 01-18-2013, 07:25 PM   #13
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Re: Injector Spider ?

Noob - Thanks for the offer but I decided to go the all new route...

I just bought the spider injector, bracket, plenum gaskets, 4 new 02 sensors, and a new catback system (to replace my old catback that rusted out)...so hopefully in a week or two my blazer will be running at the most fuel efficient it ever has, lets hope so anyway!
Old 01-18-2013, 07:53 PM   #14
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Re: Injector Spider ?

Cool , good luck man
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