The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 89 S10 4.3 Need help troubleshooting TBI/IAC Idle issue

ChevyTech · 08-27-2014, 10:39 PM

Bleed Passage:
Some TBI units have a hole (Bleed passage) to release the fuel pressure when the pump stops and some TBI units hold the pressure after the engine is shut off. I have tried to find the criteria for which units have the bleed hole and which don’t but have never been able to find GM information on this.

I will see if I have photos of this, but not today. I have more projects then time.

08-27-2014, 10:39 PM	#50
ChevyTech Registered User Join Date: May 2004 Location: Minnesota Posts: 4,620	Re: 89 S10 4.3 Need help troubleshooting TBI/IAC Idle issue Bleed Passage: Some TBI units have a hole (Bleed passage) to release the fuel pressure when the pump stops and some TBI units hold the pressure after the engine is shut off. I have tried to find the criteria for which units have the bleed hole and which don’t but have never been able to find GM information on this. I will see if I have photos of this, but not today. I have more projects then time. __________________ For those of you that are wondering why you are not getting replies to your thread: Did you give the model, year, engine, fuel system type, and transmission information? If it is modified from what came stock from the factory, let us know that too.