Oldtee

Interesting problem (see nology post earlier). I am not sure what I did that could cause this problem but the reason the engine would not start was because it was getting too much fuel. In fact the air boxes and intake tubes were full of gas. When I first started the engine after doing all the work for the tune up it ran ok, then began to run rough, then quit and would not restart. Didn't know it at the time but it was getting too much gas. Monday I am going to call the injector guys who performed my injector service (no name yet) and see what gives. Tomorrow I am going to perform another test to see which injectors are leaking under pressure. I could not believe they filled the intake ports to the point of overflowing into the air boxes. The computers are disconnected and I am going to have change the oil in case fuel got into the crank case. No, I am not going to try to start it until I get it pretty well dried out and know what the problem is. Any thoughts?

FlyingDog

A diaphragm in a fuel damper or the fpr could have failed. That will allow fuel to leak from the rails into the intake. Check the vacuum lines to the dampers and fpr for gas.

If you pull the spark plugs, the gas in the cylinders will evaporate faster. You don't want it sitting in there if you can help it.

mspiegle

double check those clips that hold the fuel injectors to the rails. If they don't "snap" into place, they probably aren't quite right. Also, after doing injector work, always pressurize the system then turn the car off to look for any potential leaks.

Oldtee

Need to update where I am on this problem or combination of problems and I hope someone with experience with these symptoms will crank up.

The situation is thus. Computers out, air boxes removed, spark plugs out, ignition switch off, battery connected, fuel pressure 2.5 bars, fuel pump bridged. Fuel pours into intake filling intake tubes, all may not be all leaking. I removed two injector electrical plugs and retested. Those two did not leak with the plug off the injector. A look at the schematic indicates the injectors are always hot with the fuel pump bridge in. There fore I suspect one or more wires may be broken in the harnesses to the injectors. Any ideas? How does the fuel pressure regulator and diaphram damper work? I intend to remove the vaccum lines today and inspect for evidence of fuel. But as I look at the system neither of those could cause the symptoms I have.

Help greatfully accepted. I am learning a lot about 85S fuel systems and I would gratefully relenquish some of the knowledge for a working car!

heinrich

yes. forget injectors look at vac

Oldtee

Thanks, you are probably correct about the injectors themselves. I talked to the injector people and if one side was grounded the injector would remain open, thus filling the intake with fuel. Engine off. Your response may be correct once I get it running.

heinrich

The injectors cannot fill the intake, they fill the cylinders.

WallyP

Sounds as if the injectors have a permanent ground - either the harness is grounded or the ECU is toast. Not the usual failure mode for the ECU, though.

Oldtee

heinrich said "The injectors cannot fill the intake, they fill the cylinders."

No so, exactly. Where do you think the fuel goes when the intake valve is open. Some of it makes a mess of the muffler the rest nicely fills the intake to overflowing.

WallyP said "Sounds as if the injectors have a permanent ground - either the harness is grounded or ...."

You win the golden washer award. The real problem was a head problem and too much work without thinking. I had plugged the injector connector into a temperature sensor near cyl one and vs. - vs. Should have known, The connectors are different colors. It was just plain stupid and caused me to learn a lot about injection systems. My somewhat very red face is mitigated by the fact that I am not the first to do it (or something equally dumb) and won't be the last. Thanks to all who answered and to those who muddled through thinking, but did not have an answer.

heinrich

When the intake valve is open ..... at every some revoutions the valves all open and close, pumping gas away from the intake? Glad you found the poroblem .. now DRIVE

mspiegle

Hmm... i bet your cats are loving you right about now

cfc928gt

If you were literally filling the cylinder with fuel it's a good thing you didn't try cranking the engine. What would you call that? Petrolock instead of hydrolock? Wonder if insurance would cover that one.

heinrich

Well he says the INTAKE was filling. I do not understand that one.