POScamaro198

I purchased a 94 lt1 Camaro and cant seem to get running Its getting spark and fuel pressure I tested the injectors with a noid light and it is not flashing I tried putting another pcm on it and did not fix the problem I checked the firing order and is good I checked all fuses and are good I tried spraying carb cleaner in the throttle body but will not run its backfiring through the throttlebody it has a new optispark installed the security light on the inside is on but not flashing im not sure if it turns off as the car starts up or not I purchased the car not running im debating on switching over to carb if I cant seem to get running I rather keep the fuel injection any help please

superspirit

I read both of your threads and a good place to start is to check for power to the injectors, that comes from fused ignition. you can find a lot of info an how and what to test here http://shbox.com/1/4th_gen_tech1.html good luck.

POScamaro198

I did check for power to injectors and i have power to them i also checked the ohms of every injector and have .09ohms on all i will take a look at the information provided thanks for your help and concern

NewOrleansLT1

I think the opti sensor might have something to do with it..

POScamaro198

when i bought the car i checked the optispark and there is a brand new one on it would the optispark cause no pulse to the injector? is there anyway to perform test to see if the opti is working correctly? thanks

NewOrleansLT1

shbox.com or YouTube will guide you threw it..

POScamaro198

thanks a lot

bufmatmuslepants

iTrader: (3)

Just having a "new" opti doesn't mean it will be a "good" opti. Alot of new ones are cheap Chinese ones that either fail out of the box or the rotor backs off and tears itself apart. I know it's a pain in the ***, but it's free, to just pull the opti and opti harness and pull the opti apart. Inspect anything for wear, then put it back together with loctite on everything. Ohm out your opti harness and wiggle it as you ohm it out for a loose connection. Pull your opti to coil wire and clean and ohm that out. Space the coil away from the head with washers to keep it cool, maybe take it to advance auto and they will test it for free. Triple check your plug wire locations. The carb cleaner trick tells me you have fuel, it seems like a spark issue. Shbox has great diagrams and writeups with values to read. What's your location? Maybe someone is close to you and can come drink beer and give you a hand.

POScamaro198

I live in lakeland fl i do have spark to the plug and fuel but i dont think the injectors are getting a signal to provide fuel i did take the opti off and everything looks new one thing i did find was the connecter to the opti had to prongs pushed back i got them to were they needed to be but no luck and the scanners at advance are cheap and half the time the guys there dont even know how to use it i looked at the website im going to do some test when i get off work today and report back thanks

NewOrleansLT1

You might need an optical sensor. It can look like new but still be bad.. I'd just replace the opti dude.. The pcm won't send fuel to an engine that can't provide spark..

sweetbmxrider

iTrader: (13)

I'd look towards the security light on disabling the injectors but that's just me.

Purple Poncho

iTrader: (1)

^^^^^ vats.

POScamaro198

I did some test that the website said to check the signals from the optispark and are good, it is brand new in not going to rule out the sensor im just going to look toward the vats as of now and im going to post a new thread I was also going to check and see if the rotor button is pointing to number 1 just to ensure the timing is correct. I bought the car none running so do any of you know when I turn my key on is the security light suppose to stay on until it starts up or is it suppose to shut off before it can crank?

shbox

VATS will kill the fuel pump, but not injectors. The two things VATS does is allow it to crank and allow the fuel pump to run. If you have both of those, it's not VATS.

POScamaro198

Do you have any suggestions where i should look into? Or anything else to test thank you

sweetbmxrider

iTrader: (13)

You sure on this? I could have sworn it also disables injectors. Mine is all bypassed otherwise I would check. I can't find anything that says one way or the other either.

shbox

Pretty sure, but if his fuel pump runs, then VATS would not seem to be an issue. A trouble code would also be present if there was no fuel enable signal.

OP, you said fuses were ok, but did you actually check for power at the injectors?

Did more looking and the book does say it disables the injectors. Never really had an opportunity to verify that.

OP, you might need to look and see if the 50Hz signal is being sent from your VATS module.

sweetbmxrider

iTrader: (13)

It sounds like he has a few issues but I think the injectors not firing is vats related. Someone probably indexed the opti wrong too

cprmn14

When I did my swap I didn't have pulse to the injectors but had voltage, turned out my new gm opti was bad.

80/TA/LT1

iTrader: (2)

I bought a 93 z with the same problem, figured it was vats right away, bypassed it-still nothing. I then noticed the pcm wasn't bolted down t was just hanging by the harness, well all the tension was on the shortest wire in the harness- the blue pulsewidth fuel signal enable which snapped. I'm with shbox on checking the 50hz signal