Electric issues

[El Chapo]

I’m finally putting everything back together after installing the new wire harness and the rebuild injectors, Vacuum hoses have me stumped! Can someone tell me where the Y shaped vacuum hoses coming out of the throttle body go/get connected Looks like they head towards the back of the engine under manifold. I can see the BPV on the valve cover but there is also an elbow connector on the actual upper manifold, both have a larger diameter hose fitting so a bit confused. Thx for any help. Almost ready to get it on the road.

[mat in tn]

if you are talking about the two 3/16" lines that come off the base of the throttle body on an efi. they get connected to a y fitting then a 1/4" hose goes to the charcoal canister by the battery. true they come out of the throttle body on the distributor side, but they swing underneath and toward the front. later models had a single 1/4" port on the passenger side with a purge solenoid and the "t" was integral in the throttle body. so yes, they fixed it later on.

[El Chapo]

Thanks Mat, it’s starting to get a little clearer here’s a picture just to confirm and that it connects to the hard plastic tube connected to the charcoal can. I had it reversed but for this picture I flipped it like you said going towards the can next to the battery.

[mat in tn]

that is correct. it usually goes under the throttle body and comes out more in line with the heater hose and the steel extension before turning toward the canister. it's routed that way to stay clear of belt driven accessories.

[El Chapo]

Also where does the PCV port/elbow on the back of the upper manifold go? Does it go to the passenger side valve cover.?

[mat in tn]

pcv valve/90 goes in the passenger side valve cover and the hose goes to the upper intake. some models have a fitting coming out the back of the upper plenum facing the firewall and uses a short hose to connect, and some others have an extra 3/8" port on the top of the upper intake on the driver side and require a longer hose to reach it

[El Chapo]

Thank you I think I’m finally getting there your help has been an encouragement and a great help.

[El Chapo]

still no start!! Darn. Fuel in the line up to the new FPR but not going into the rail, etc. what the operates the fpr?

[mat in tn]

hold up! wait a minute! the fuel pressure regulator is downstream of the rail and injectors. it regulates by letting excess pressure to bleed off back to the tank it came from.  

[mat in tn]

the two fuel lines are made different sizes so that no mistakes are made in this regard at the factory. double check where your fuel is. are you priming the system? it does not simply need fuel. it needs fuel at pressure to atomize.  

[mat in tn]

I went back and reread the thread. you say that you can hear the fuel pump. which one do you hear?  if the only pump running is the in-tank pump, it will not start. its only there to prime the rail pump which is the one supplying operating pressure for the injectors.

[El Chapo]

Ok so I have the lines switched and that would make sense. But before I switch them, I will note that the line that is coming from the in-line filter which is feed by the high pressure pump is connected to the fpr side of the rail my understanding now is that it should go to the other side of the fuel rail? I check which pump is turn on a bit later

[El Chapo]

We’ll hells bells I have a runner lines were switched… rookie mistake my bad. Sounds ok at idle rev a little rough so I fix those vacuum hoses. Thank you Mat!!!

[El Chapo]

Thanks to everyone for the help!!

[mat in tn]

very good. glad to help. I'm a little confused at how that was possible, but I guess the early models had fuel lines the same size. I now want to figure out that for certain! maybe we find out why they dropped the stamped steel rail also. maybe we figure out why the rest of them have Shrader valves.

[grumpin]

Good news! Good job all!

[El Chapo]

Hey Mat, I took pictures of the fuel rail etc, before I put everything back together and as you can see both tube connectors are the same size but one side is larger past the connecting point. Which I now understand is the fuel inlet side.

[El Chapo]

I had been meaning to post this of my completed harness.

[El Chapo]

Well it starts …but it’s “All Bronc and no go! :( maybe it’s time to give up on this engine have it rebuild it or acquire a new engine one? Take a look at these pictures! Installed new plugs not much improvement and now it pops like back firing or something. Darn it right!!

[Gary Lewis]

It looks like it is running VERY rich.  I'd check to see that the choke is opening fully.  If so I'd check to see if the power valve in the carb is blown.  Either of those can cause that condition.