'86 Fiero v-6 injector/running issues
niccaleb112602
01-07-2013, 03:28 PM
I tried everything. Started out back "odd" cylinder injector fuse would blow. Found injectors had a weak Ohm value. around 6-8. Changed all injectors. Now the back cylinders are not firing at all, front 3 are fine. No fuse blown. Noid light shows computer is firing injectors. Has spark at all cylinders.?? Whats missing? Compression is at 110-120 on all.
Tech II
01-08-2013, 11:16 AM
Disconnect, the injector harness.....crank over several times.....
Temp has to be above freezing....spray carb cleaner into intake while someone cranks the vehicle......if it starts and runs, you know it's a fuel delivery problem....either pressure low, or injector problem....
This is a multiport engine.....so 1-3-5 injectors all fire at the same time....the same for 2-4-6 injectors.....one bad injector(if shorted), will cause the driver for the 3 injectors to shut down.....all injectors should have 12 ohms across each of them......but when you measure the harness with an ohm meter, since the three are in parallel, they should ohm out in the circuit, at 4 ohms.....
Doesn't this engine also have a "cold start" injector?
Temp has to be above freezing....spray carb cleaner into intake while someone cranks the vehicle......if it starts and runs, you know it's a fuel delivery problem....either pressure low, or injector problem....
This is a multiport engine.....so 1-3-5 injectors all fire at the same time....the same for 2-4-6 injectors.....one bad injector(if shorted), will cause the driver for the 3 injectors to shut down.....all injectors should have 12 ohms across each of them......but when you measure the harness with an ohm meter, since the three are in parallel, they should ohm out in the circuit, at 4 ohms.....
Doesn't this engine also have a "cold start" injector?
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