iroc88z-28

I had it running great, drove it for 6 weeks then it started to stall out, and now wont fire at all. It turns over just fine but does not fire. It threw codes:
13 Oxygen sensor circuit, 32 EGR system, 33 Mass Air Flow (MAF) sensor, 36 MAF Burn-off relay circuit fault, 42 Bypass or EST problem.
I replaced the MAF burn-off relay and now the check light comes on but no codes.

details:
had a 5.0 tpi now has 5.7 tpi
new fuel pump & filter
gets spark
new ignition switch
new alternator
new MAF sensor

Es_91rs

Is it getting fuel? You can test this by turning the key to the on position but don't try to start it. Then after a few seconds use a small pick or very small screwdriver and depress the center of the schrader valve on your fuel rail. Looks kind of like a valve stem from a tire. If you have fuel shooting out then perhaps there's another issue with your ignition system. If you don't have fuel it's possible that your new pump is no good or that the relay for the fuel pump is bad.

rusty vango

that only tells if you have fuel present. not if its enough pressure. if the OP has stock injectors, id start there

Es_91rs

I wasn't implying that this would check to see if he had enough fuel pressure but simply if he had fuel at all. Can't really test if the injectors are bad without first finding out if fuel is getting to them.

mlbinseattle

I'm guessing the car had been sitting for a while. You said, after 6 weeks, it began to stall. I'm speculating, but I'd bet the EGR valve is clogged with carbon. I'd get the wiring diagram and look for anything coming off the computer that controls the fuel line. If the computer thinks the EGR valve is bad, it may be shutting off the fuel supply. Again, I'm just speculating, but clogged EGR valves will cause an engine to idle rough to the point of stalling. There may be a way to test the EGR valve, you'll need to find that procedure.

Es_91rs

Well now that you said that, could we entertain the idea that the oil pressure sending unit is bad? I know that the computer would shut the fuel pump off if it's not reading that there's acceptable oil pressure.

mlbinseattle

It's definitely a possibility and worth checking. I just mentioned the EGR valve because that's one of the codes he had listed, and he stated that it began to stall before not firing up at all. Yes, I do think the computer is shutting down the fuel supply, and seeing how he put a new pump in already, that's where I'd start ... seeing what items on the fuel line that the computer controls and then seeing what sensor/valve is causing the computer to do this.

Es_91rs

The MAF could also cause issues with the car stalling and not allowing it to fire. If it's defective that is. But I +1 the idea of starting at the fuel system and going from there.

iroc88z-28

Fuel is fine
it was not sitting for a while, I just got done with the engine swap.
it has a new oil pressure sending unit

mlbinseattle

So, it's getting spark and the fuel is fine. I assume you mean that it's getting up to the injectors. Throwing any codes?

Edited: Okay, I jumped the gun. You said it's not now throwing any codes. Does it do anything, like try to start?

Es_91rs

Did you hace the ECM properly tuned for the swap? That could be the problem all on it's own. If it's got fuel and spark then maybe you should be looking at that.

iroc88z-28

I got a obd reader and it is saying that the problem is the 'transmission gr sw'