I'm in the middle of a tpi swap on a previously carb'd 350. Everything is installed and wired up, but when I went to fire it last night the engine was not getting any fuel. It is getting spark but injectors are not firing.

The ecm is supposedly off an 88 camaro with a 350, it is a mass air cold start injector setup 165 ecm and the fuel rail lines taking a hard left towards the drivers side..

The ECM has an aftermarket replacement sticker on it like you would get if your factory ecm died and you bought one from napa or so. It also has a hypertech chip installed. Between those two, I would assume vats would have been disabled so they could reuse the same ecm when replacing it, and also so hypertech wouldn't have to burn a custom chip for every application.

Is there a way to check if vats is enabled? Is there anything else that would cause this problem? Once again, it is getting spark, so I think that should trigger the injectors. I wired this up using the haynes book as a diagram, I have heard there are some problems with that book, but for the most part isn't that book 86-89 model year friendly?

 

did you check your injector fuses?

 

injectors are getting 12 volts.

 

Hypertech chips do not come with VATS disabled by default. However, they are willing to do that for you. Get the part number off the chip, call Hypertech, and ask if that prom has VATS disabled.

VATS or no VATS, when you turn the ignition to ON, the fuel pump should run to pressurize the rails. The ECM gets the signal from a PINK/BLACK wire located in A6 of the ECM connector. At that point, the GREEN/WHITE wire (location A1) turns on the fuel pump relay and sends power out the TAN/WHITE wire to the fuel pump.

The injector power wires should be hooked up to an ignition power source, one 10 amp fuse for each bank. The ECM grounds the circuit to turn on each bank through the two wires coming out of the ECM (location D15 and D16).

The cold start injector has absolutely nothing to do with the ECM and is totally separate from the ECM wiring.

That should be enough information for you to diagnose your problem. Hope it helps!

 

I only said it was cold start so you knew what era ecm it was, since I'm not totally sure it is an 88. Same reason I told you the way the fuel lines bend

I said above I was getting 12 v to the injectors, but they are not firing, so its not fuses.

 

I outlined the fuel system wiring so you could use that info to diagnose your problem. You should now have enough information to properly diagnose it.

 

fuel pump is working, it is 12 volts to the injectors, but once again the fuel injectors are not firing. there is continuity on the injector wires back to the ecm. I checked that stuff already

when a noid light is hooked up, they are not firing.

 

have you checked all of your ECM grounds?
you've checked voltage at your fuel pump?

 

Check the ECM grounds.

 

I had basically the same problem when i did mine,spark, but no pulse to the injectors, turned out it the prom chip....and it was a new chip i bought from a business, couldn't figure it out for days, threw in the old chip just out of curiousity and it fired up. Not saying that that's what it is, but a thought to think about.

 

I hate it when people don't update their problem threads with the solution

Its been a while, but it was the memcal. Was not seated correctly in the pcm.