The three lines hanging under the truck connect to a valve on top of the 4x4 transfer case, this is why the 4wd does not work. As for the throttle body lines there should be a diagram on the radiator support that explains that. You should have one large line that goes to the PCV valve, a small line going to the air cleaner, a small line connected to the MAP sensor and possibly another connected to a valve that controls the EGR valve. Your fifth line should connect to a port on the manifold that supplies vacuum to a tank that is the vacuum source for the HVAC control doors and the front axle engagement system. The axle engagement system is what the line hanging by the transmission under the truck is for.
SOURCE: chevy s10 broken vacuum line
The plastic line in the wiring harness goes to the heater controls; and believe it or not , the other end goes to the vacuum tank - but its in the FENDER !!!!! behind the ABS, kinda under the drivers side hood hinge - great place to put one ain't it ? No wonder GM is going broke !! Good Luck
SOURCE: STARTING PROBLEMS WITH CHEVY S10 2003
first you need to check if your are getting spark, then go to fuel pressure, you should have 60lb of pressure
SOURCE: 87 chevy s10 4x4 vacuum diagram
NOTE<< If Picture Does Not Show Please Email Me @ [email protected] And I Will Send it to You It IS DETAILED And COMPLETE Diagram of Exactly What You Ask For.
Vacuum and Vapor Hose Diagrams
Notes
Vacuum Actuation System
SOURCE: i need a 1987 chevy S10 vacuum hose routing diagram
Go to Autozone.com, become member, will give you repair manual,location of parts,diagrams.
SOURCE: 1987 Chevy Suburban 350 2wd not starting or running right
What size engine do you have in it? And, how many miles on it?? Well, I guess it really doesn't matter. At first thought it sounds like you are experienceing a fuel problem, and changing the throttlebody didn't solve your problem. I would start by looking and checking my fuel delivery system. The fact that you had to spray gas into the throttlebody tells me that fuel is not getting there. I would start with the least expensive thing to fix first. Check your gas filters. These are often , OFTEN, overlooked as a sorce of problems, and are rarely changed and often overlooked, and are the problem alot of the time. If that dosen't cure your problem check your fuel pump. Make sure it is delivering the proper pressure. I would bet your problem would be solved, but if it's not then next I would check the electrical components of your fuel system.
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