Runs on Cold Start Valve Fuel Then Dies
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Joined: Dec 2019
Posts: 5
Runs on Cold Start Valve Fuel Then Dies
On my 1983 280ZX NA 5-speed, I've replaced fusible links with New and replaced damaged ECU with Used with same designator A11-652-805 - all because I connected a new battery reverse polarity - a dumb, mindless mistake from not tracing my cables first.
Noid light shows injectors not being triggered (only unplugged #6 and checked). Resistance at each injector measures between 2-2.5 ohms except for one at ~1.4 ohms. With key on, there's no light on my ECM. Have run searches, but don't see a clear path for troubleshooting next steps. FSM sort of hard to follow...is EFI relay next check?
Brand new to the Z car world. Had a good running one until this mistake.
Noid light shows injectors not being triggered (only unplugged #6 and checked). Resistance at each injector measures between 2-2.5 ohms except for one at ~1.4 ohms. With key on, there's no light on my ECM. Have run searches, but don't see a clear path for troubleshooting next steps. FSM sort of hard to follow...is EFI relay next check?
Brand new to the Z car world. Had a good running one until this mistake.
Thread Starter
Registered User
Joined: Dec 2019
Posts: 5
On my 1983 280ZX NA 5-speed, I've replaced fusible links with New and replaced damaged ECU with Used with same designator A11-652-805 - all because I connected a new battery reverse polarity - a dumb, mindless mistake from not tracing my cables first.
Noid light shows injectors not being triggered (only unplugged #6 and checked). Resistance at each injector measures between 2-2.5 ohms except for one at ~1.4 ohms. With key on, there's no light on my ECM. Have run searches, but don't see a clear path for troubleshooting next steps. FSM sort of hard to follow...is EFI relay next check?
Brand new to the Z car world. Had a good running one until this mistake.
Noid light shows injectors not being triggered (only unplugged #6 and checked). Resistance at each injector measures between 2-2.5 ohms except for one at ~1.4 ohms. With key on, there's no light on my ECM. Have run searches, but don't see a clear path for troubleshooting next steps. FSM sort of hard to follow...is EFI relay next check?
Brand new to the Z car world. Had a good running one until this mistake.
Thread Starter
Registered User
Joined: Dec 2019
Posts: 5
Solved - Start but No Run Problem
Followed EFI troubleshooting guide in FSM and performed all checks with no findings, except...
On the throttle valve switch insulation test; pin #29 tested grounded.
Disconnected plug at throttle valve position switch, pin #29 still tested grounded.
Disconnected larger connector at ignition module and pin #29 ground cleared.
Installed new ignition module at distributor, reconnected everything I'd disconnected and re-installed used replacement ECU - bingo it runs!
Disconnected plug at throttle valve position switch, pin #29 still tested grounded.
Disconnected larger connector at ignition module and pin #29 ground cleared.
Installed new ignition module at distributor, reconnected everything I'd disconnected and re-installed used replacement ECU - bingo it runs!
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