im still trying to resolve the no start problem. i switch out the ignition components double checked vacuum lines plugs and wires. fuel pressure is a little above 40. i start the ignition and it sounds like it wants to turn over but doesnt. after sitting a while and i jump it off another car it starts. it runs, a little backfire from time to time but stays running. i turn it off, and its the same.
pressure holds at 40 and slowly drops about 10 every hour.
no gas or smell of gas in the fuel regulator vacuum line. no leaks around the injectors. both the injectors and fuel regulator are original. it seems like at start its getting too much fuel or not enough? i dont get it.
ideas?

 

i also did switch out the tps at the front of the manifold, as was suggested before. i just pulled #1 plug to check it and it is not wet or smell like gas.

 

Have you checked that you have spark? Which ignition components did you replace exactly?
Does the car start if you spray a little bit of starting fluid into the intake?
Your fuel pressure appears to be fine. The pressure going down over time is normal.
Do you have any trouble codes stored? You mentioned that your car ran after having gotten jumped.
Sounds like you might have electrical issues.
You can also check the resistance on your injectors just to make sure they are within spec.
What is your base timing set at?

 

i have extra ignition modules, caps and rotors. i traded them out with the extras. i recently dropped in a street fire igntion system, new wires, plugs, and coil. i have a spark check and its getting spark. it is operating normal.
there are no codes at all. i havent tries to spray starting fluid. ill have to get some. i checked the fuses and they are fine as well.
the vss is out but that shouldnt cause the problem. i went out to try it again and it started as normal. in fact i looked over everything and see that my oil pressure gauge is working properly now. before it was pegged out. the oil pressure sensor shouldnt have an effect should it? its only a back up to the fuel relay.

ill have to get a jump on it in the morning. ill double check the timing and post it. i had set it at 8 degrees back (i did disconnect the connector near the pass fender.)

how do i test the resistance at the injectors with a multimeter? or is there a link to it?

 

i seem to be having about the same problem. i have a 87 l98 5.7 camaro, i bought it off some guy that had it under a tree in his backyard all mest up.. well at first i was getting 35lbs on fuel release pressure gauge, so i replaced the fuel pump because i thought it was too low & was also told by NAPA auto parts that minimum should 70-100lbs. now i dont have any pressure at all. and cant seem to find the problem to it.. i do get spark, i replaced fuel relay, rechecked pump, replaced fuel filter.. i was told there are two wires that should go to possitive on battery for injector to turn on but i do not know which ones they are.. i do not know what else i can do to it inorder for me to get my fuel to come back up. any help would be helpful thanks

 

You can check the resistance on the fuel injectors by disconnecting the wire connector and measuring the resistance between the terminals on each injector. I don't recall how many ohms they need to be off the top of my head right now.
The oil pressure needs to be at least 6-8 psi in order for the fuel pump to run. If oil pressure falls below that, the fuel pump relay will switch off the fuel pump in order to prevent a catastrophic engine failure.
I would return the base timing to 6* BTDC according to the factory specs.
Make sure that everything runs properly before trying to mess with and modify things.

 

the quickest test to rule out fuel is if it starts on a shot of ether and dies. then you know you are not getting fuel. If it does not start on ether, then check spark or compression.

 

RestLess92, your vehicle is somewhat different from the PO's(MAF vs. S/D) and while your fuel pump controls work the same, there are other issues common to the 87 that will cause a no start. You should really start your own thread. BTW, FP for 87 is 40psi with no vacuum to regulator, 35 with vacuum. 70-100 would be dead head pressure.

Saculia, actually, the fuel pump relay and oil pressure switch are not connected, except on the pump power side. While it would be a great idea for GM to do this, there is no oil pressure switch protection of the engine. The FP relay activates with key on for 2 seconds on command from the ECM, then when the ECM sees crank reference pulses, it again activates the FP relay, regardless of oil pressure. The OP fuel pump switch is only a back up to the relay. It will prevent fuel pump operation due to no oil pressure only if the FP relay, or the relay circuit, is faulty.

Saculia made some excellent points concerning the connection between jump starting the car and it starting/not starting. bungy is riht on that if the engine starts with ether, the problem is fuel related. Try checking your battery connections. How is your cranking speed without boosting? Does the engine crank slow? You may want to have the battery tested. If voltage is dropping too low, the ECM may not be operating properly during engine crank.

FP is normal as is the drop over time. To check injector resistance use a multimeter. They should read between 12 and 16 ohms.

 

i appreciate everones input on this. it was helpful. in the end it appears the problem is the injectors. with some assistance from southbayfuelinjectors.com i discovered that the minimum resistance is 12 ohms per injector. a test of each injector resulted in 6 injectors below that standard. im getting the required spark, the required fuel pressure, but the injectors are 21 years old and done.

restless, i hope this helps.