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DFI and ECM Discuss all aspects of DFI (Digital Fuel Injection), ECMs (Electronic Control Module), scanners, and diagnostic equipment. Fine tune your Third Gen computer system for top performance.

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Old 06-29-2009, 09:53 PM   #1
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Join Date: Oct 2006
Posts: 171
Car: 1987 IROC-Z Z28 Convertible
Engine: LB9
Transmission: 700R4
Axle/Gears: 3.23

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I have an 87 IROC I'm trying to get on the road. Its a 5.0l TUNED PORT. It has fuel pressure at the lines to the engine underhood, but the car has pressure at the rail under the plenum. I have a code 12...it tells me a code 12 can stop the engine from running. Am reading the entire service manual and have not found any way to diagnose...thoughts?
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Old 06-30-2009, 09:03 AM   #2
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Car: check
Engine: check
Transmission: check

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Code 12 on a non-running engine is normal, and should happen.

During cranking do the injectors fire? Is there spark?

RBob.
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Old 06-30-2009, 09:03 AM
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