no injector pulse, but fuel on spark plugs
#1
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
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
#2
Senior Member
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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.
#6
Boost Pope
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Join Date: Sep 2005
Location: Chicago. (The less-murder part.)
Posts: 33,339
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The fuel and ignition pulses are triggered by the two CAS lines, and referenced to a load value computed off the AFM.
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.
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.
#9
Boost Pope
iTrader: (8)
Join Date: Sep 2005
Location: Chicago. (The less-murder part.)
Posts: 33,339
Total Cats: 6,793
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.
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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