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Old 06-01-2010, 01:39 PM   #1
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Location: Houston/Port Arthur
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Question No injector signal

Turn the car on and the fuel pump doesn't kick on, first thought was burnt up. Ran a jumper wire and the pump still works, pressure is good. I checked the injectors with a noid light and nothing. Would a bad pump relay cause the injectors to not receive a signal from the PCM? Car still cranks fine and still gets spark.
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Lawrence
'92 Z M5
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Old 06-01-2010, 10:54 PM   #2
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Sorry no help here. Maybe you can help me. Where did you get your noid light. I've wanted one for years but cannot find one.
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Old 06-02-2010, 11:32 AM   #3
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Matco truck.
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Old 06-02-2010, 03:14 PM   #4
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Sounds like a VATS problem. Does the security light stay on?

If the VATS checks out OK, you may have a problem with the distributor pickup or ignition module.
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Last edited by Marc 85Z28; 06-02-2010 at 03:18 PM.
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Old 06-04-2010, 12:40 AM   #5
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Quote:
Originally Posted by laZy View Post
Matco truck.
Thank you very much. Matco comes to the maintenance dept. where I work on fridays. I'll ask him about one.
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1989 Firebird Formula, 305 TBI, auto, 100% stock
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Old 06-04-2010, 02:08 AM   #6
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Click the image to open in full size.

I had been going through some of the wiring in the car and trying to fix some of the hacked jobs. Unfortunately this is my first 3rd gen so some its new to me, I can do a 4th gen from memory. The photo above is what I encountered with the + battery cable, didn't know what it went to. Still not sure about the blue wire but the red 14g wire in the weatherpak conn was the culprit, THIS WIRE MUST BE CONNECTED. Long story short, checked the fuse by the battery and it was good then checked all three relays by the brake booster and they were good. I remembered those wires and said what the hell, put a jumper to the blue one and nothing then the red one and the clouds parted the sun shone and angels sang
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Old 07-10-2010, 12:59 AM   #7
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If your pick up coil is bad or on its way it 1)injectors wont fire. 2)no spark at coil. One symptom can occur or both at the same time. check ohms at two wire connector at dizzy by touching both connectors. It should read 500-1500 ohms. Then touch one prong and ground to the dizzy there should be no ohms or continuity. If either fail then its the pick up coil. The pick up coil gets the signal first then transfer to coil then IGM and runs from there.
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Old 07-10-2010, 12:59 AM
 
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