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No Response from Injector 1

 
Old 07-31-2010, 09:28 PM
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Default No Response from Injector 1

Ok, I've been troubleshooting this for awhile now, and I'm no further to an answer. Injector one shows no response during "injector test" and while driving.
I've tried:
-different injectors (factory MSM and DW 800's)
-different injector locations (swaping 1-4 etc)
-Travis took a look at my ECU
-Voltage confirmed the same as the other rails both by ECU data and multimeter (~11.4V) during "injector test" and simple key in the power on
-different firmwares (V1,V3,V5)
-different maps

The attached injector test is a MSPaint hand drawing of what it's doing. It's not a screen shot. This problem started with the factor injectors. I thought I cooked a factory injector, so I order some new ones. The 800's did the same thing. Sent Travis the ECU to take a look at the ECU. Got it back, and it did the same thing at first, but then all of sudden I got a response similar to the other injectors (grey), but it was never a consistent slope. I tried wiggling the wires to the injectors (all 4) but nothing seemed to be the cause, so I decided to put the car back together. When I got the car back together, it was back to the example picture. Same 3-cylinder Piece of ****.

Does anyone know any reason why this could be happening?! I haven't driven the car in month. This **** is getting old.
Attached Thumbnails No Response from Injector 1-injector-example.jpg  
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Old 08-01-2010, 09:39 PM
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When I first installed my injectors, I was getting the same type of response. It turns out I accidentally bent the electrical connector on the number 1 injector. It sounds like you might have a different problem though.

It might be worth looking at the adapter board and making sure the solder connection is good.
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Old 08-01-2010, 10:39 PM
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Did you connect a multimeter to the injector harness clips and then fire the 'injector test' and then see the voltage register?
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Old 08-02-2010, 12:27 PM
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You could also check the wiring resistance from the adapter board to each injector clip to make they're all about the same. I believe Travis has a wiring diagram for the adapter boards.
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Old 08-04-2010, 12:07 AM
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Originally Posted by dgmorr View Post
Did you connect a multimeter to the injector harness clips and then fire the 'injector test' and then see the voltage register?
I did. The voltages list are a little low due to a low battery but I hooked up a multimeter to a good and bad injector locations. Voltages were the same during accessory mode as well as when I fired the injector test.
I put the factory msm injectors and stock ecu back in and it runs on all 4 cylinders. Travis told me he'd take car of me so that's where we are at right now. The only variable left is the ecu.
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