1994 GMC Sonoma Fuel Spider injector

Tiny
TH4545
  • MEMBER
  • 1994 GMC SONOMA
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 113,000 MILES
What would cause the spider injector to keep going bad.I have had the truck for a year and already replace it twice and now 3months since the last one I thing it's gone bad again?
4.3 V-6 wvin number cpi
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Monday, November 10th, 2008 AT 7:42 PM

10 Replies

Tiny
MASTERTECHTIM
  • MEMBER
What is going wrong with them? Leaking? Hard start? Usually when they are replaced they last a long time. I know these engines are very finicky about fuel pressure and volume and they have tons of problems with the rubber pulsator in the fuel tank. The pulsator connects the pump to the sender and ruptures causing lower fuel volume creating all sorts of driveability problems
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Monday, November 10th, 2008 AT 7:48 PM
Tiny
TH4545
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The first two would make the truck stumbly around 1800 to 2200 rpm's. Finaly not running at all. This time it starts fine and with in 15 sec it stalls, starts right back up and wont have any other problem until I turn it off. Now it's doing the same as the first two and now very hard to start. Drive around with fuel preesure gauge and it does not drop below 60 psi when problems happen.

Also new fuel pump and filter about 1 month ago
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Monday, November 10th, 2008 AT 8:09 PM
Tiny
MASTERTECHTIM
  • MEMBER
Did you replace the pulsator? Its the piece the fuel pump slides into? The problem your describing does not sound like a injector problem. To check for proper fuel volume you need to install a amp meter in series with the battery positive terminal and the fuel pump test lead(the test lead is usually a gray wire or red wire by itself with a female connector at the end)
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Monday, November 10th, 2008 AT 8:53 PM
Tiny
TH4545
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Had a fuel preusseure gauge on it holding the bleeder valve on the gauge pressure drops to 30psi and the truck stays running. Driving around the pressure stays around 58 psi
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Monday, November 10th, 2008 AT 9:04 PM
Tiny
MASTERTECHTIM
  • MEMBER
That is also a good test for fuel volume so that is ok. Next step would be to watch data on a scan tool. Monitor coolant temp, o2 sensor voltage to make sure you dont have a shorted o2 sensor. Does the check engine light come on? Did you check it for codes? You can jump terminal a and b on the diagnostic connector under drivers side of dash and it will flash the codes through the check engine light.
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Monday, November 10th, 2008 AT 9:09 PM
Tiny
TH4545
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It has been on a scaner and has no codes.
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Monday, November 10th, 2008 AT 9:30 PM
Tiny
MASTERTECHTIM
  • MEMBER
When its hard to start, try spraying a shot of starting fluid into it and see if it starts right up. It needs spark fuel pressure and injector pulse to run, we need to find out what we are missing or losing. If you have a spark checker like a st125 that measures coil output voltage or another kind of spark checker but not the flashing light kind because that does not check voltage, we should have about 25000 volts. I have seen weak coils cause this same symptom.
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Tuesday, November 11th, 2008 AT 5:03 AM
Tiny
TH4545
  • MEMBER
I'LL check the voltage But all was new, I replaced it all when the first spider injector went bad. New plugs, wires, cap, rotor, dis, and coil.I was replacing everything I could thing of. It's just doing the same thing as the first two times the spider went bad.
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Tuesday, November 11th, 2008 AT 8:11 AM
Tiny
TH4545
  • MEMBER
Replaced spider unit and all is fine. Just hope this one will last
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Tuesday, November 11th, 2008 AT 3:42 PM
Tiny
MASTERTECHTIM
  • MEMBER
Thats odd that they keep failing, I have never run into that before. Good luck
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Tuesday, November 11th, 2008 AT 5:08 PM

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