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2G No fuel in #3 or #4

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Jacob_Barnes520GST

5+ Year Contributor
100
8
Feb 21, 2018
Tucson, Arizona
Heres an interesting one, I replaced my throttle body today with new gaskets, and all of a sudden I have no fuel in 3 and 4. I pulled the plugs and 1 and 2 were wet but 3 and 4 were dry. Can anyone give me an idea why the injectors aren’t pulsing? The car will try to start after the first few cranks but then won’t do anything
 
Sounds like you have a bad connection check for power at the injectors with a volt meter, to see if you have power to them. Sounds random if the others are working and you just did a gasket change.
 
A couple of connectors will interchange, if I remember right the a/c connector and the coil pack plug interchange or it might be the cam/crank sensor and a/c connector, in any event go back and check those if you had them off.
 
I have been looking this morning, and I found that my knock sensor wire came loose from the main harness plug. Would this cause a no start issue?
 

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Nothing unless you have bad wiring, if you have two that works but the others don't, sounds like wiring issues, could be a gremlin lurking around.
 
I’ve traced the wire loom that’s below the tb and all the wires that go to the injectors and haven’t found anything. Anyone think it’s a bad resistor pack?

Also tested power to injectors and have power to all of them
 
Heres an interesting one, I replaced my throttle body today with new gaskets, and all of a sudden I have no fuel in 3 and 4. I pulled the plugs and 1 and 2 were wet but 3 and 4 were dry. Can anyone give me an idea why the injectors aren’t pulsing? The car will try to start after the first few cranks but then won’t do anything
How do you know 3 and 4 arent firing correctly but 1 and 4 dont just have spark issues.
 
If they were wet, they were getting fuel but not burning it. Maybe I'm crazy but what it sounds like.
Firing order correct?
PTU plugged in good?
 
I checked the firing order and the ptu is plugged in well. That was my first suspicion. I will check the ptu again. Seems logical because that is in the general vicinity of the TB. I will try to check again when I get home and keep this updated
 
The resistor pack supplies 12v to the injectors, since you have 12v we can assume the resistor pack is fine. How did you test the ecu? Since you don't have injector pulse on 3/4 but do have power that means something between the injector and ecu is not supplying a ground. You need to check for ground pulse at the ECU on 3 and 4.
 
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