no injector pulse, but fuel on spark plugs
Hello,
I am working on a 92 1.6 Miata US. We checked for a lot of possibilitys, but car wont start. - sparks are firing - without spark wires, sparks are wet from fuel - its a engine with problem crank, but TDC is fine. I hooked up my Emanage Ultimate datalogger, for any reason, I get zero injector pulse. But as said above, there is fuel on the sparks. I guess the ECU is dead, leaving injectors all time open, but other ideas would be great. Falk |
well, if the ecu was dead, i wouldnt think it would hold the injectors open like that, i would say that the injectors are opening, but your datalogger cant tell. lets see a list of mods, that would be a good place to start.
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No mods, basic 1.6 Miata,
its not my car, just a friend with car shop asked me to take a look on this because he checked all standards without success. That why I hooked up the Ultimate to see some data in the logger. Falk |
I've seen injectors wired wrong that just stay open and don't pulse. But you'd be getting tons of raw fuel out the exhaust pipe.
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Noone touched them,
car stoped driving and thats what we have now. I was thinking the AFM is dead, but datalog shows fine voltage. Else parameters like temperatures are fine too. From what parameters is the ECU generating the injector pulse? Falk |
Originally Posted by Falk
(Post 219741)
From what parameters is the ECU generating the injector pulse?
The fact that you are getting sparks suggests that the CAS triggers are being received. Was the engine running previously and then stopped, or did this happen as soon as the EMU went in? If that be the case, I'd ask about the wiring between the ECU and the EMU, and between the EMU and the injectors. |
Hello Joe,
the EMU was only hooked on to find the problem, we have these pnp harnesses here. The car was running correct before, no issues. Falk |
Originally Posted by Falk
(Post 219853)
Hello Joe,
the EMU was only hooked on to find the problem, we have these pnp harnesses here. The car was running correct before, no issues. Falk |
Yup. What he said. Adding complexity isn't a good troubleshooting method.
This is where having access to an oscilloscope starts to become less-than-optional. You would be well served by having some way to look directly at whats going into and coming out of the ECU in real time. |
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