was the sensor expensive? how about the ecm? just in case.

 

So what do yo thnk the problem is? Fuel pump? ecm? oil pressure switch??

 

Sensor is available through GM, it was about $85. ECM was I believe $200 with exchange. NAPA carries them.

Jim

 

You didn't read my earlier post. The ECM is the primary enabling driver (switch) for the fuel pump relay (FPR). The oil pressure sensor switch is a (normally) redundant voltage supply to the FPR. As long as the ECM FPR driver IC is functional, the oil pressure sensor (OPS) switch is just dead weight. In the event that the ECM takes a significant internal dump, then some ECM backup circuitry will crudely control the injector pulsewidths, but will first rely on the OPS switch to turn on the FPR, enabling the fuel pump to turn on and pressurize the system. The OPS is a simple switch, and will only shut down the fuel system (under ECM failure mode) when oil pressure is not present.

Mike

 

First, I would recommend you take DWncchs' advice and get a repair manual to help diagnose the problem. This makes life so much easier, and helps explain the operation of the system.
Second, in the mean time, try to check for fuel pressure, either by hooking up a guage, or at the least, listen for pump noise coming out of the tank. Even with crappy fuel pressure the fuel should still dribble out of the injectors if the ECM is trying to switch the injector solenoids. As long as the engine is being cranked, the distributor will send the engine rotation signal to the ECM, and the ECM will toggle the injectors.
ECM? Possible, but rarely the problem. These are designed to take a lot of electrical abuse, whether from normal operation, or from careless hands. I don't recall reading that you did anything terribly abusive. Just check that you have all your connections snug, and that you are getting 12 volts to the ECM and to BOTH sides of the injector connection during non-cranking conditions. If you don't have the 12 volts at all four injector pins, then something is wrong. (You can manually trigger the injectors by hooking a 4-6 ohm resistance to the ECM side of the injector, but that's kind of an advanced diagnostic trick that I would recommend only if you are comfortable working with ECMs.)
Oil pressure switch? No.

Good luck, and keep us posted.
Mike

 

Thanks, I found out what the problem was and It makes me both happy and mad. Mad because I was a idiot and spent $200 for a injector i did'nt need. Happy because i found the problem. The injector fuses looked ok but under further inspection they had a little corrosion on them so i replaced them and she started right up!! I could'nt believe it!! It is running a little rough and cuts out on the road when I floor it. I hope it's just needing the plugs replaced or something now.

 

Could still be fuel related. The problem when other people do things before you buy a car is you still never know. Is the pump working? Is the filter good? Is the fuel pump sock new?

Anyway you can check the fuel pressure? You can replace the fuel betwwen TBI's with a braided one and insert a fuel pressure guage. Or Take it to a shop and have them check it. You need to out rule fuel pressure as being the problem.

The other thing could be the TPS. You have a meter now. Instructions on how to set it at the other side.

Jim

 

YEAH...I lived that nightmare too!! Thinking that my injectors were going bad, maybe needing a tune -up...come to find out I was out of gas . My gas tank sending unit gauge would quit after a half tank of gas, so I would be empty but according to my dummy (now I see why they call it that) gauge I was at a half tank . I was ready to write Congress and let them know I was getting the greatest gas mileage ever.....till I ran out of gas .....check that fuel!!

 

Kevin here is a manual that many of us have.I realize its another $100 but linked it up with the guys here on the forum you would get a great return on your money.When you have a future problem(and you will)we could all be on the "same page" when we try to help you.I guarantee you the procedure in the book would have led "you" to that corroded fuse and if not it would have got you close and "we" could have taken you the rest of the way.
.....Maybe you could swap that injector for a manual .....
http://www.ecklers.com/product.asp?p...&dept%5Fid=226

 

I have that great book. Picked it up on Ebay...$30. Try there too.

Jim

 

Several for sale on ebay

$20
http://cgi.ebay.com/ebaymotors/1982-...spagenameZWDVW

$68
http://cgi.ebay.com/ebaymotors/1982-...spagenameZWDVW