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Old 09-10-2010, 02:05 PM
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no current to tbi

I have a 1988 suburban, 350 tbi injection. have no current to the injectors, have replaced ignition module and computer and still no current? not sure what else to check??

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Old 09-10-2010, 02:19 PM
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You will need to use a scan tool to get the code for the problem.
The computer (CPU) will fire the injectors if all the correct data are coming into the CPU.
For example, if the crankshaft position sensor is at fault the CPU can't fire the injectors.

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Old 09-10-2010, 02:45 PM
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no current or no power?
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Old 09-10-2010, 03:55 PM
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There should be power at the injectors anytime the key is on I believe. They fire the injectors by pulling up the ground. Check for a blown fuse or fusible link.
Do you have spark ?

Edit: the red wire and the white wire are fed directly from a fuse. It looks like there is a splice under the hood in a pink wire in the feed circuit. Check all fuses and trace back from the splice
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Old 09-10-2010, 07:16 PM
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The pink with black stripe wire is the power feed to the injectors. It comes from the ECM 1 fuse in the fuse box.It is powered all the time the ignition is on (in start and run)
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Old 09-13-2010, 02:18 PM
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no current ???

then no power ,

so there is no way to get it run any where !!!



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Old 09-13-2010, 07:02 PM
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Should be 12 volts when the ignition is on. By saying there is no current, then there is no load and the injectors are not firing. You can have 12 volts at the injectors and not have any current if there is no ground. If they are not firing (and there is 12 volts) then I'd look at the pickup coil in the distributor.
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