I'm looking for some help with my 1988 firebird. I know it will start and run. I have had it running twice now. Once when I replaced the throttle body assembly and once when I adjusted the idle set screw. Both times it ran fine and strong until I went to turn it off, the next day though the car would not start.

List of codes I am getting:
15- tempature coolant sensor circuit
34- MAF(for 89 and earlier v6es)
54- Fuel circuit something or other

What I've done so far to the car since I bought it.
-battery
-replaced front calipers and rear drums (needs brakes bled still)
-replaced fuel filter
-replaced damaged portion of the fuel line
-replaced fuel relay
-replaced MAF
-changed oil
-flushed radiator
-changed spark plugs and wires
-replaced throttle body (part stores didn't have a gasket so I improvised and made one from some kind of paper-like gasket material)
-replaced IAC
-replaced TPS

Fuel pressure seems ok at around mid 30s psi.

So knowing it will run I have to be close right? What it does now is it will turn over but no fire.

I scavenged some parts of a 86 2.8l camaro that I may need like:
-tranny cable that attaches to the throttle body (mine is busted)
-plenum top gasket
-throttle body gasket
-starter
-alternator
-seats (mine are bad)

So that's it. I made a similar post in my other thread but I thought it was getting over looked since it is more of a update thread.
I'm really hoping someone can help me out here. If I can't get it running I'm just going to have to sell it and recoop some of my money, since I need a car so I can get to and from work. Well heres hope'n Thanks for reading my long post.

 

Hey you found your own answer! You said fuel pressure is 30 psi? The car won't run at 30 psi. It needs at least 42 psi.

Low PSI could also be caused by low voltage at fuel pump- which is the code 54. Code 54 is usually a wiring issue. I know you said you changed the relay, but here's the official GM code 54 chart- run through it because it checks all the wires going to the pump. Step 1A will tell you right away if the pump is bad. https://www.thirdgen.org/forums/post...811-post3.html

Let us know what you find out... also when you check each wire, look for corrosion or damaged connectors. You can also do the "wiggle test"- wiggle each wire and see if the problem goes away... if it does, the wire's bad and should be replaced (at least that section of it).