I have searched and searched some more on here to see if anyone has had the same issue I am having and have not found one so I am starting a new thread.
I have a 96 Lt1 and I am not getting any fuel out of the injectors. The car had a high rpm miss and missed very hard when the ac was on. Friend said it was the opti so I replaced it without checking anything else. Stupid I suppose, but I thought he knew what he was talking about and evidentally he didnt. Anyway after putting it all back together it still wouldnt crank so I started trouble shooting and thats when I realized I wasnt getting any fuel.
I have checked all the fuses, they are fine. I checked the button on the fuel rail and it will squirt fuel anytime you turn the ignition off and back on. The car is getting fuel up to the fuel rail but the injectors are doing nothing with it. I can hear the fuel pump so I have eliminated it being a fuel pump problem. I opened the butterflies while cranking and can see no fuel squirting into the system. There is also no smell of fuel.
I feel it is something electrical that triggers the injectors but I have no idea what the part could be.
Also I have put a computer on the car and it gives no codes.
Thanks,

 

Grab a noid light to see if you are getting injector pulses from the PCM. If not, then its likely time to replace the PCM.
PCM= Powertrain Contro Module (computer)

The good thing is, the 96 is easy to get.

 

In common usage, the phrase "wouldn't crank" means that the starter is not spinning the engine. I understand you mean that the engine turns over but will not start, however.

There are things that have to occur before the PCM will even try to provide a ground path to fire the injectors so I would not rush out and buy one on a hunch.

There is a detailed Optispark diagnostic in the FSM that you need to follow to make sure that the PCM knows that it is time to pulse the injectors.

Since you went from a high RPM miss to a no start condition by changing the Opti, I believe that there in lies your problem not in a blown PCM.

First things first: Verify all connections to and from the Opti and ICM. Search here or buy the FSM to follow the Opti tests using the diagnostic test connector at the top front of the intake. Or re-install your old Opti and see if it will start then you know that you have a failed, new Opti.

I hope that you are at the point of the proceedure where you check for engine start before re-installing the crank pulley and water pump.

 

I did not go from a high rpm miss to a no start after changing the opti. I went from a high rpm miss, and low rpm miss especially when ac was on, to a no start before I changed the opti.
This wasnt just a slight miss. It was like the car was shutting off then right back on. This was not constant, just occasionally but it seemed to be getting worse.
I have checked and re-checked all of the connections on the opti and all other connections. They are all connected.

The car will crank as in turn over but it will not start. It will not even sputter, backfire, pop or anything. It just keeps on spinning. I have checked the fire by pulling a plug wire and getting spark from it. I checked the injectors by putting a screw driver on the end and listening. They are clicking.
The car is getting fuel to the fuel rail, all the fuses are good.
Question is what would cause the injectors not to squirt any fuel. A sensor/silinoid?
Once again I put a computer on it and the computer read the car and showed no codes.
I was told if the pcm is bad the computer will not read. Is this true?

This has got me stumped!!!!!
Thanks for the help!!!!

 

OH! well if the injectors are clicking and the plugs are sparking then I have to wonder if there is fuel in the rail. Do you get a squirt at the pressure test valve?

 

Yes fuel at the rail. I checked it 4 times by turning the key on, squirting, turning the key off and back on squirting again etc. etc.
After cranking on the motor and while cranking on it I opened the butterflies on the intake and didnt see nor smell any fuel.

 

seen this a few times.. the fuel pressure regulator is stuck causing no return to the tank. The pump puts out 60+ psi. The multecs will not flow with pressure over 50. The ball and seat valve "lock up" If you hear them click and you have fuel in the rail then why would it be the pcm. For the injector to click the driver in the pcm is sending the ground signal. Check fuel pressure in the rail. if its 50 plus. get a regulator or check for obstruction to the return system. In one of the videos on multec failure in the sticky, it shows how multecs lock up mechanically, not electrically. Worth a look with your symtoms.

 

I pulled the fpr and there was fuel in the line going back to the tank.
If it was stuck there shouldnt be any fuel in that line or at least I would think there shouldnt be any fuel in the line. I have a fpr to put on this evening.
I will let you know.
thanks

 

just checked ohm levels on injectors they are 12.7 or thereabouts. within .2 of each other.

 

Just replaced the fpr and still no start. Turns over fine and has good pressure through lines.
Injectors are not releasing fuel.
any suggestions?
thanks

 

Better get that fuel pressure guage on there as suggested. The ohms sound good, that tells you the coils are healthy......but has nothing to do with pressure.

 

what should the fp be? if it is too high what would cause it other than a fpr?

 

you have a wierd case.. the FP should be around 43.. over 50 the injectors won't work. there is also a posibilaty that the injectors are clogged at the filter in the end of the injector. maybe a bad tank of fuel? who knows. Since its a lt pull the rail up and remove an injector and see if the thing is clogged up at the filter in the inlet/

 

Ive been to Auto Zone twice to get fp gauge. 1st one was junk and broke. 2nd one doesnt fit on nipple so it wont work either.
In the mean time I did pull a plug after turning motor over and plug was dry as could be..
The fuel rail is not clogged. It pushed fuel out when I had the fpr off.
Maybee one of the injectors could be clogged but not all 8. I should get some sort of fuel to the cylinder.
What else will tell the injectors not to release fuel other than the fpr?

I will try again to get a different fp gauge to check the pressure even though I dont think this is the problem. If it were the problem the new fpr that I installed would have solved the problem.

 

Would it start before replacing the Opti?

You won't see fuel there.

A noid lite would show whether the ECM is grounding the injectors.

 

It would not start before replacing the opti.
And Your right I know I wouldnt see fuel by opening the butterflies but I thought I would at least smell some fuel.
I will get a noid light to check the injectors. They are clicking when turning the motor over.
I have pulled the fuses then turned the car over and there is no clicking from them. I put the fuses back in and I can hear them click as the car is turned over.

 

So you suspect it's a fuel issue.. have you tried starting it on starting fluid? If it is in fact a fuel issue it should start right up for a few seconds.. What is the fuel pressure while cranking?

 

Wifes making me quit for the evening. 1st thing in the morning I will try the starter fluid.
I do not know the fp while cranking. I have not found a fp gauge that will work on the car as of yet. I can tell you that it will squirt fuel everywhere when you push the button on the fp line while turning the car over.

 

Are you sure you hear them click? Measure power at the injectors while you crank it.

 

Yes they are for sure clicking.
How do you measure the power of the injector? with a ohm meter or a noid light?