So I bought a 2003 blazer extreme. Previous owner said hadn’t ran in 5+ yrs. Says new reman engine about 10,000 miles ago.Said he parked it because the trans stopped shifting out of 2nd. So it sat. I get it home looks clean fluids all look good & full. it won’t start. Find no fuel pressure. Determined bad fuel pump.ok. Replaced fuel pump. STARTS! But that’s it. Give it any amount of gas it just stalls out. Coughs & dies. Won’t start again till the next day. It tries,acts like it’s flooded or not enough gas or no spark something. To this day it hasn’t acted any different regardless of the parts & money I’ve thrown at her. Let’s start there. I’ll start first part to last part installed. Fuel pump.fuel pressure regulator.with ign on 62 psi. removed spider injector cleaned & tested with multimeter.new plugs wires cap rotor icm. Used spark tester all cylinders have good spark. Maf sensor.ran obd2 scan tool gave me some codes but no engine codes. I’m lost please help.

 

sounds similar to what was wrong with my rig, You probably have vacuum leaks, plug off the vacuum ports on the engine, they will be located at the PCV Valve port on the upper intake manifold. If no dice, check running voltage at the fuelpump and verify you have battery voltage, verify your grounds are good, if you find a low voltage condition with good grounds then i would go for the ignition switch, as that ended up being my problem. Clear all codes and see what comes back.

 

I’ve put 2 different fuel pumps in it. The first was a 20$ one from online that only gave me 55 psi but it ran. I suspected low fuel psi first. I did the leak down check. Had good voltage.checked the ground resistance. Idr what it read. But it passed my checklist then. So I replaced that with an ac delco. 65psi,passes leak down.I didn’t re check the voltage & ground. New fuel filter. If I don’t touch the accelerator it’ll idle till it runs out of gas. I had the plenum off. Replaced the fuel pressure regulator & all the gaskets. My partner said he hears a vacuum leak. I can’t find it. I’ll try what you said tomorrow. & the ignition switch was next in terms of throwing money at it. Also do I have to reprogram the pcm after installing the new maf. I suspect I may have a computer programming issue. I just don’t know.

 

The PCM should never need reprogramming unless you remove or add a function, such as PCM Controlled electric Fans or removing the Smog AIR Pump.