No injection pulse, help (Round two)

[KPEclipse]

Well back to this nightmare of a 14b upgrade. This whole ECU issue has been figured out, I have an ECU with a good socket.

I replaced the fuel pump that was in there with a 190(after which I found out that the 255 I had in there just had a bad relief valve)

Now, the car won't start, and everything has been checked. What we've found is a new issue - no injection pulse.

The way the injectors are supposed to work, I understand, is that the ECU sends a pulse through a wire for when the injectors need to come on. The ECU that I have in the car has been tested by the makers of dsmlink - it works.

So the wire coming from the ECU were checked, and theres NO SIGNAL coming through the wire that's supposed to fire the injectors. The wire inside the harness is pushed ALL THE WAY IN, because I thought that from swapping ECU's it could have been pulled out. That's not it, because every ten or so cranks, the injectors fire, but obviously thats not good enough.

So does ANYONE have ANY idea why the injectors wouldn't be fired? What would make the car not fire the injectors? I tested the injectors to see if they had power(12V) and they do, but I never checked the resistor pack DIRECTLY. The crank and cam sensor are both good, so rule that out.

Somebody give me SOMETHING, why would there be no signal going to fire the injectors? It has to be a wire or something somewhere, anyone have anywhere to start or ANYTHING? I really gotta figure this out, and it's killing me...

 

[TurboAnything]

man are you sure. Each injector plug gets 12v from the resistor pack. Then when the Ecu wants to fire the injectors it gounds each one. you need to check for a pulsating ground its best to use a test light so you can see them. hook up on side to the battery + terminal put the other side to the non 12v wire side of the injector plug and have someone crank the engine. It should pulse if it dose not pulse the the ecu is bad or the wires are not making contact somewhere.

 

[KPEclipse]

yeah I'm sure, the ecu was tested by ecm tuning so i know for sure its not the ecu. i know im not getting pulsating ground, so thats basically my question, where could the wires not be making contact?

 

[GVR4592]

What are you using to check for the injector pulse?

 

[tom04841]

Most test lights and multimeters will not show a pulse when testing injectors. You need an injector noid to actually test it.

 

[KPEclipse]

a guy at the shop has a snap on modis...it tells u basically everything ON the modis screen...