burn-t280zt Posted July 16, 2012 Share Posted July 16, 2012 I have a 78 280z with a 82 l28et, first the car ran great, took it down to the store and on the way back started to run funny and backfiring. the front three cylinders you can pull either the plug wire or the injector plug and does not effect the idle. checked the injector plugs at the injector and at the plug at the ecu and they have voltage, and when the cars running you can pull the plug wires and see arc coming off the plug wires, just at a point where i dont have a clue what it can be. bad plug wire, injector, ecu? any advice would be nice Quote Link to comment Share on other sites More sharing options...
cgsheen Posted July 16, 2012 Share Posted July 16, 2012 Did you pull the plugs? Quote Link to comment Share on other sites More sharing options...
Zmanco Posted July 16, 2012 Share Posted July 16, 2012 I believe the injectors are powered by 2 circuits - 1 for the front three, and another for the back three. That's the only aspect of the FI L28 that I'm aware of that's segmented with the front three cylinders all having a common fail point. I'd start by checking the wiring for the injector dropping resistors to see if one of them has a poor connection. Just because you measure 12V one side of the injectors doesn't mean that the the circuit is able to conduct enough current for the them to fire properly. Make sure it's clean and has a good mechanical connection. Quote Link to comment Share on other sites More sharing options...
dexter72 Posted July 16, 2012 Share Posted July 16, 2012 If you place the tip of a long srewdriver against an injector, while the engine is running and your ear on the handle. You should hear a clicking noise from the injectors. No Clicking and they are not working, try that. And I agree, check the connections at the dropping resistors and the dropping resistors themselves. Quote Link to comment Share on other sites More sharing options...
burn-t280zt Posted July 18, 2012 Author Share Posted July 18, 2012 thanks for the advice local parts place let me borrow their tester for the injector plug. the plugs and showing that they are functioning properly, so i will be trying replacing the front three injectors. Quote Link to comment Share on other sites More sharing options...
rejracer Posted July 18, 2012 Share Posted July 18, 2012 I would pull the injectors and check to see if they are clogged. The chances of 3 injectors failing at once is slim. As posted before, I would start with electrical. I can 2nd that the injectors are fed power in banks. Quote Link to comment Share on other sites More sharing options...
burn-t280zt Posted July 23, 2012 Author Share Posted July 23, 2012 found out the problem buddy came by and we tried his ecu, and low and behold the ecu is the problem. now the search is on for a turbo ecu Quote Link to comment Share on other sites More sharing options...
HowlerMonkey Posted July 24, 2012 Share Posted July 24, 2012 Check the impedence of your injectors just in case they were the cause of the injector driver failing. Quote Link to comment Share on other sites More sharing options...
rejracer Posted July 25, 2012 Share Posted July 25, 2012 Try cleaning the ECU pins and connectors on the existing ECU. Quote Link to comment Share on other sites More sharing options...
superduner Posted July 30, 2012 Share Posted July 30, 2012 ^^^^ I motion.... If the car has been running fine and from a Simple trip to the store the ecu became bad that's no bueno. I don't think that happens regularly. Clean pins with non aggressive sandpaper and or copper brush to clean surface. And make sure your ecu is plugged in appropriately. Might've been bad connection or intermittent circuit. Or maybe you just never swapped ECU's to the appropriate turbo one lol Quote Link to comment Share on other sites More sharing options...
HowlerMonkey Posted July 31, 2012 Share Posted July 31, 2012 I wonder if the battery tipped until the positive terminal touched the body and then righted itself after the cornering was finished. This can put a hurting on electrical components but usually results in burnt wiring from the alternator. Quote Link to comment Share on other sites More sharing options...
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