Vats and Injectors pulsing.
Was your starter enable relay jumped? did someone jump the wrong wires and cause a short? They don't just melt. If the relay is actually distorted physically and melted, it was shorted BUT the short has to be in the yellow wires that are the HOT wires...
If its only the black goo you see on the plug..thats GM grease used to seal off electrical components. You should see the headlite actuator relays...
I'm not going to guess and you are not open to whats been presented, so I will leave you with this...
the starter enable relay will not stop the inj pulse. THAT comes from the vats module, which looks for the key resistance to complete the circuit.
go find the key value and get a resistor the same value and install it in the cable in the column. Measure the key pellet.
If the module is functional that is a temp bypass that will allow the module to operate the inj.
If the inj still do not cycle, the module may be at fault. The bypass module is available UPS ground. If you want to locate your own, search google and good luck. They get expensive.
Do you KNOW that you have fuel pressure? and good ignition? When starting, the ECM controls the fuel pump and will NOT allow the pump to run UNTIL the engine turns over @ a min 300 rpm without ANY starter voltage. This signal originates from the dist that tells the ECM the engine is running so the ECM then enables the fuel pump to run and maintain tension on the rails. It is designed this way to prevent flooding. The system can still flood when ANY single inj shorts out and causes the entire BANK to short, sticking wide open and dumping raw fuel into 4 cylinders...it runs real rough...
You claimed earlier that it ran and you found fuel inj that were bad and one that was dead. The ONLY way you could do that is IF the VATS was functional. If your noid lite shows ANY inj cycling then the vats module is OK.
Again, if you just WANT to have a vats problem, you can bypass it and sleep easy. Otherwise, if it runs, if the noid lite does anything, the problem is NOT with VATS.
Your FSM should help confirm what I've attempted to explain to you here.
good luck.
Was your starter enable relay jumped? did someone jump the wrong wires and cause a short? They don't just melt. If the relay is actually distorted physically and melted, it was shorted BUT the short has to be in the yellow wires that are the HOT wires...
If its only the black goo you see on the plug..thats GM grease used to seal off electrical components. You should see the headlite actuator relays...
I'm not going to guess and you are not open to whats been presented, so I will leave you with this...
the starter enable relay will not stop the inj pulse. THAT comes from the vats module, which looks for the key resistance to complete the circuit.
go find the key value and get a resistor the same value and install it in the cable in the column. Measure the key pellet.
If the module is functional that is a temp bypass that will allow the module to operate the inj.
If the inj still do not cycle, the module may be at fault. The bypass module is available UPS ground. If you want to locate your own, search google and good luck. They get expensive.
Do you KNOW that you have fuel pressure? and good ignition? When starting, the ECM controls the fuel pump and will NOT allow the pump to run UNTIL the engine turns over @ a min 300 rpm without ANY starter voltage. This signal originates from the dist that tells the ECM the engine is running so the ECM then enables the fuel pump to run and maintain tension on the rails. It is designed this way to prevent flooding. The system can still flood when ANY single inj shorts out and causes the entire BANK to short, sticking wide open and dumping raw fuel into 4 cylinders...it runs real rough...
You claimed earlier that it ran and you found fuel inj that were bad and one that was dead. The ONLY way you could do that is IF the VATS was functional. If your noid lite shows ANY inj cycling then the vats module is OK.
Again, if you just WANT to have a vats problem, you can bypass it and sleep easy. Otherwise, if it runs, if the noid lite does anything, the problem is NOT with VATS.
Your FSM should help confirm what I've attempted to explain to you here.
good luck.
Good information in a supportive tone is one thing, but to chastise to make up for lack of self esteem is quite another issue. Let's hope you don't have a dog.
http://www.chevythunder.com/code_46_vats.htm
Last edited by MrWillys; Oct 23, 2013 at 10:25 PM.
The ECM commands EGR by turning on the EGR solenoid mounted on the thermostat housing. The EGR solenoid applies vacuum to the EGR valve. When the EGR valve opens, hot exhaust gasses travel through that tube and into the intake manifold. From there they go into the plenum. When the EGR temperature switch senses the hot exhaust gasses going through the EGR tube it sends a ground signal to the ECM to tell it that the EGR system is working.
It's quite common for the ceramic part of the switch to break. Sometimes the wire breaks off at the top because it make a sharp bend there.
Thanks again.








