I'm at my wits end here guys and gals any input greatly appreciated '82 collectors edition 350 crossfire cranks fuel umbrellas out of injectors beautifully for 2 to 3 seconds then begins to spit then stops. got it 3 or 4 months ago taken off all emissions put on headers and true duals new distributor plugs wires '85 fuel pump hypertech chip replaced pressure regulators, temp sensor still can not get her right...about ready to use her for target practice!! any suggestions or something you might see I've missed.

 

do you have spark?

 

what exactly did you remove from the car?

when you put the headers on, did you put the O2 sensor back on the new exhaust?

 

yes I have spark

 

no did not put o2 sensor back on this problem was present before exhaust was replaced

 

removed air pump and of course stock exhaust

 

No advice but ill give you a grand for it if your gonna use it for target practice

 

what are you using to tell the injectors when to fire?

 

with no O2 sensor it's no wonder it wont run, the computer needs the info it supplies to tell the injectors how much fuel it needs to run right. I would imagine there is a saftey system the won't let the injectors to squirt fuel without the computer getting all the info it needs.

 

That's the crank angle sensors job

No.

 

so even with all the rest of the emissions stuff gone the o2 sesnor still needs to be hooked up?since this condition existed before exhaust was replaced maybe 02 sensor was bad?

 

get a book

 

wow. Do you know how a fuel injection system works? Is the factory computer still in the car?

you may need to find someone who knows what they're doing. Seems like you're in over your head at this point.

 

first thing would be to retrieve the trouble codes. You need to understand how the system works before you can fix it. read up on the crossfire injection and get a manual. the system is really very simple once you understand how it is supposed to operate. good luck with your diag

 

An '82 has speed density, which means the two most important inputs to the computer are engine speed (RPM) and density of the air coming in. That is determined by the MAP or manifold absoulut pressure sensor. The RPM signal is received from distributor, which has been changed. You

There may be code stored in the PCM, look up "GM Flash Codes" to get an idea on how you check them (no scan tool neede), and what they tell you.

If you left the 02 sensor out it won't cause this. The O2 sensor only works after it warms up. And until it starts to send a signal, the engine operates in "open loop", meaning it ignores the sensor. So without any sensor there, it stays in open loop all the time.

Sounds like you're having a fuel problem. Injectors fire and then stop. But we don't know if you're running out of fuel, or the injectors are just not opening.

First thing would be get a fuel pressure guage on there, and make sure that it's holding pressure. Even with the replaced pump, there are lots of things that could cause a loss in fuel pressure.

The other thing I would check is to make sure the injectors are firing. You can use a test light to check the electrical connection at the injector. If the pulse as you crank the engine. If the light pulses, then the computer and it's wiring is doing it's job. If the light doesn't pulse then you have a problem with either the computer or it's wiring (remember to make sure the computer is getting that rpm signal from the distributor). If the light pulses, and you have fuel pressure, then your injector is bad.

 

My plugs had fire but would not fire the engine. They were fouled with fuel. Try some new plugs, with spark on new plugs and fuel from the injectors you should get it to at least run. Unless you have bigger engine issues. Yes you do want the o2 sensor though. And the map sensor which hopefully you didn't remove with the emission stuff.

oh yeah, oil pressure sensor on back of intake is very important for fuel as well.