Cannot find source of Misfire
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Driver
Joined: Dec 2015
Posts: 96
Likes: 4
From: sc
Cannot find source of Misfire
I have a 1992 with Aristo ECU and a single turbo NA-T. Cylinder 3 will not fire. i have checked all I know to check so if anyone knows what else can be wrong, would you please post it.
Here's a list of what I have done.
Swapped injectors 1 and 3, misfire stayed on 3.
Swapped plugs 3 and 4, stayed.
Put the 3-4 coil on 3 with the lead running to 4, stayed.
Put a noid light on 3, getting good flash.
put injector 3 connector on injector 4, cylinder 4 runs with this.
continuity check injector connector to ecu and other injector connectors. good.
pulled vacuum hose off fuel pressure regulator, nothing.
jumped fuel pump with 12 volts in diagnostic connector, nothing.
verified timing.
valve clearance good.
Compression 180 psi. leakdown test was great 100%.
Thank you for any help.
Here's a list of what I have done.
Swapped injectors 1 and 3, misfire stayed on 3.
Swapped plugs 3 and 4, stayed.
Put the 3-4 coil on 3 with the lead running to 4, stayed.
Put a noid light on 3, getting good flash.
put injector 3 connector on injector 4, cylinder 4 runs with this.
continuity check injector connector to ecu and other injector connectors. good.
pulled vacuum hose off fuel pressure regulator, nothing.
jumped fuel pump with 12 volts in diagnostic connector, nothing.
verified timing.
valve clearance good.
Compression 180 psi. leakdown test was great 100%.
Thank you for any help.
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