TwinTurbo.NET: Nissan 300ZX forum - Heres what I meant
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Subject Heres what I meant
     
Posted by Woody75 (Denver) on May 01, 2012 at 2:06 PM
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In Reply To Re: It's a 1994. posted by njz on May 01, 2012 at 01:32 PM
     
Message I mentioned I was doing it through the computer rather than physically to show that the computer is reading them all correctly and that the connections are physically good back to the ecu. The path from the sensor to the ecu appears to be good and have no issues. I can break everything physically and check as well but I think doing it via the laptop/ecu is proving it out even further.

The stumbling is always there when running. But when I kill a cylinder it gets even worse as it should becasue the cylinder is basically becoming all the way dead. So once I kill a cylinder all I can feel is the miss from that as its much worse. Cant really track down what cylinder is stumbling, if its only 1 at all.

To me its acting like it could be an injector issue where its not flowing enough fuel as in the injector is partly clogged or its not spraying correctly. I've replaced 2 of them. So there are only 4 more to swap out. But on the other hand, I dont have 4 new ones to try and buying them not knowing if it will fix the issue kinda sucks. Then we get into the whole thing of them being old style, so if I'm replacing all of them, might as well get new style now. Which leads to plenum pull, adaptors, harness change, etc, etc. And then we dont know if it will even fix anything in the end. Doing the work is nothing, its doing it and not getting anywhere is whats bugging me right now.

Could be a spark issue as well. There obviously is spark at every cylinder as they are all firing, but it could be weak. Visually the spark appears to be fine when doing a test outside the cylinder grounding it to the plenum. Spark plugs are new as well. All parts I swapped out came off a currently running Z. So the PTU, CAS, TPS, FPC, coils, etc are known to be good and working correctly so I'm kinda ruling out the spark being the problem at this time.


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