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No injector pulse


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So I have a 1976 280Z and one of the previous owners DIY'd an alarm system using about 9 thousand wire splices and 4 different relays. I've gotten the alarm out it seems, but for some reason I'm getting no injector pulse. I've had a friend mechanic over to take a look but he can't figure out why I'm getting no injector pulse. I've looked for threads of this nature but didn't find any useful info. I need to get rid of this car asap :cry2: and I'd appreciate it if anyone had any input, thanks ahead of time guys :o

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try disconnecting the ECU plug, blow out the connection and plug it back in. It sounds crazy, but has actually worked a few times.

 

interesting....I'm in the middle of diagnosing my failed smog and running tons of FSM tests using a voltmeter/ohmmeter, and my number 5 injector returns no voltage when tested at the ECU...wonder if this is part of issue - if I need to "blow out" the ECU harness hole there?

 

Or, are there other common reasons that only 1 injector would return a "0" voltage read (I'm running rich, not lean, so I'm thinking this isn't part of my smog problem...)?

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To troubleshoot OE FI you have to use the EFI Bible

 

http://forums.hybridz.org/showthread.php?t=135748

 

Crow, if you are not getting an injector pulse you first need to check if you are getting 12V on ECU Pin 1 with the ignition on. Go from there through the troubleshooting tests in the EFI Bible. If you are not getting 12V on ECU Pin 1 then your coil is not getting voltage from the ignition control unit (ICU). The testing procedure for the ICU is found in the FSM.

 

I pulled an alarm system, a RF booster and a stereo installation that epitomized the definition of sub-saharan engineering out of my Z when I bought it. I've been down the road your on. Use the manuals available and keep working on it.

 

Philbert, same for you. You mention using the FSM and a multimeter so you are certainly on the right track. Looking at the EFI schematic, both injector 5 and 6 share the same circuit. I.e., If injector 6 is getting power, then injector 5 should as well. Do the test for injector 5 on page 65. If you are not getting 12V on ECU pin 30 with the ignition on, then you have a short in your circuit. Then its just a matter of testing continuity until you find the break.

 

Good luck.

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To troubleshoot OE FI you have to use the EFI Bible

 

thats more of opinion then fact, these EFI systems are simple and easy to learn. I would consider the EFI bible a good reference book for new guys who know nothing of EFI systems or how they work. 80% of all problems i have found on EFI s30's s130's and z31's where just corroded connectors, or the AFM.

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To troubleshoot OE FI you have to use the EFI Bible

 

http://forums.hybridz.org/showthread.php?t=135748

 

 

Philbert, same for you. You mention using the FSM and a multimeter so you are certainly on the right track. Looking at the EFI schematic, both injector 5 and 6 share the same circuit. I.e., If injector 6 is getting power, then injector 5 should as well. Do the test for injector 5 on page 65. If you are not getting 12V on ECU pin 30 with the ignition on, then you have a short in your circuit. Then its just a matter of testing continuity until you find the break.

.

 

Thanks! I printed out the EFI bible a couple months ago (whe I failed smog and knew nothing about EFI) and have been using it to learn about and test my EFI system (though some of the tests are different in my 1980ZX specific FSM - so I did the FSM tests too).

 

I'll try that test you recommend - but I'll also try blowing out the ECU plug to see if that's got dsut in it, blocking the circuit ;)

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