Only two injectors getting power????

[cruisintalonawd]

What would cause this problem. I searched but other people were have no power to all 4 not just 2 of 4

 

[Dsmj89]

Make sure the connectors are clean and connected right.

 

[EPA nightmare]

What would cause this problem. I searched but other people were have no power to all 4 not just 2 of 4

How are you testing for power at the injectors? With a test light, a noid light or a Multi meter?

 

[Silver 95 GST]

another way to test is to disconnect each injector individually, monitor idle rpm drop and reconect, then repeat on another injector. If an injector is not working there will be no change in rpm after disconnect.

Good luck

 

[Silver 95 GST]

Also if there is no chnage in rpm after disconnect it could have power, but be clogged.

 

[cruisintalonawd]

How are you testing for power at the injectors? With a test light, a noid light or a Multi meter?

Neither I pulled the fuel rail and let them spay(ghetto I know), but I switched the injectors around and it was still the same thing.

 

[cruisintalonawd]

another way to test is to disconnect each injector individually, monitor idle rpm drop and reconect, then repeat on another injector. If an injector is not working there will be no change in rpm after disconnect.

Good luck

I can't get it to stat on two cylinders

 

[Silver 95 GST]

Inspect wiring as much as possible for signs of damage or discontinuity.

 

[greggs]

maybe its clogged or somthin its better to change it rather leaving it like that

 

[cruisintalonawd]

I switched the wires around on the fuel rail and it made no difference, so I don't think it would be clogged.

 

[tqmx1]

Have you Ohmed out the resistor pack? Pim #3 is the feed and pins 1-4-5 & 6 Should have resantance. If not guess what you need.

 

[cruisintalonawd]

which pin is what number?????and how much

 

[cruisintalonawd]

Ok so I tested a know good one and mine and they are the same resistance 12.7-12.5

 

[tqmx1]

OK that checks that leaves 2 things the wiring back to the ECU or the ECU. The pins where they plug into the ECU are cylinder 1 goes to pin 51 ECU #2 to 52 #3 to 60 and #4 to61. If the wiring checks clean that leaves the ECU.

 

[cruisintalonawd]

I guess it's the wires then....i use a good NT ECU just to try and start it but that didnt help either. Can I do the OHM meter to check the wires, from the ECU connector to the injector connector?

 

[cruisintalonawd]

Can I do the OHM meter to check the wires, from the ECU connector to the injector connector?

I tried this and I got nothing. Does any one know how to test the wires

 

[EPA nightmare]

I tried this and I got nothing. Does any one know how to test the wires

You should be able to test continuity with a multi meter on the circuits from the ECM to the fuel injector connectors. Your readings should be at or near 0 ohms as the ECM uses these circuits to control the ground path for the fuel injectors. Also, with the ignition key on, use a multi meter to test for 12 volt positive at each of the injector connectors. If you are not getting 12volts to all of the injectors, then your injector resistor pack is at fault, as all circuits in the resistor pack receives 12 positive from a common feed. If both of these tests pass, you can make a set of noid lights using some 194 bulbs, (marker light bulbs). Just bend the small wires at the base of the bulbs straight and plug them into injector connectors. Have someone crank the engine over and watch to see if all of the lights are flashing. If they are all flashing, then your injectors are probably at fault. If some fail to light, then you probably have an internal ECU problem.

Heres the ECU pins you need to check for continuity to the injector connectors.
Pin# 51- #1 injector
Pin# 52- #2 injector
Pin# 60- #3 injector
Pin# 61- #4 injector
1G ECU Pinouts

If you'd like to test the injectors off of the car to verify weather they are at fault or not, you can use a tool like this one from OTC, or ask a local shop to test them for you.
OTC 3397 Fuel Injector Tester

Hope this helps.

 

[cruisintalonawd]

I pretty much checked the injectors already, and I've tried two different ecus so its gotta be the wiring, maybe the MPI relays???

 

[EPA nightmare]

I pretty much checked the injectors already, and I've tried two different ecus so its gotta be the wiring, maybe the MPI relays???

If the MPI relay was faulty, you wouldn't have power at any of the injectors, the ignition coils, or the cam angle sensor. So you would have a no start condition.

Use the steps above in order, and through process of elimination, you should be able to find the problem. If you think it's the wiring, test the cicuits listed and this will prove weather or not they are at fault.

 

[cruisintalonawd]

Injector connector voltage

4- 7.66
3- 7.67
2- 7.8
1- 7.9

 

[EPA nightmare]

Injector connector voltage

4- 7.66
3- 7.67
2- 7.8
1- 7.9

Check your battery voltage, I just went out to double check on my car, and I'm reading 12.23 volts positve at the connector. 12.30 volts at the battery.

You must be logged in to view this image or video.

 

[cruisintalonawd]

well I just checked the voltage coming from the injector pin on the ECU and it was 11.32

 

[EPA nightmare]

well I just checked the voltage coming from the injector pin on the ECU and it was 11.32

So you checked it with injector in place? Are you reading voltage at all four injector injector control circuit pins at the ECU? Pins 51, 52, 60, 61,

 

[cruisintalonawd]

I just did 60 but I'm about to check the rest

 

[91DSMdragin]

Dont Forget The Turbo And Non Turbo Ecu's Are Not The Same. Even If The Ecu Worked Great In Your Buddies N/t It May Not Drive Your Turbo Injectors. Different Resistance Between The Turbo And Non-turbo Injectors. I Had Same Problem A Few Years Ago And A New Ecu Did Me Fine.