I have had to disconnect the ground from the battery to reset the distributor and to replace the starter. But that is it. I will revisit post 8 so I can get this Blazer running good a sold cause it’s been here since late April early May.

 

The fuel pressure leak down test, are you saying just see what the pressure holds at or by injectors balance test?

 

We may need an injector balance test at some point but for now I mean the 10 min fuel pressure leak down test at the fuel rail shrader after key on.

George

 

Alright here is the information I have so far:
Outside Temp: 82
Outside Barometric Pressure: 30.12
IAT: 86 degrees F
ECT: 82.4 degrees F
MAP: 14.21 PSI
Barometric pressure: 14.07 PSI
Fuel PSI: (key on/engine not running)
1)56 PSI (initial start of test)
2)46 PSI (end of 10 mins)
3)42 PSI (end of 10 minutes with key off)

 

I do not know where to go from here, I have new distributor, AC Delco rotor and cap, AC Delco plug wires & plugs, new AC Delco fuel spider, new Delphi fuel pump, Wix fuel filter, new Bosh O2 sensors. I am completely stumped.

 

There are a lot of moving parts to this story so I need to figure out where we are at.

1. All of these parts cannon changes can be confusing things. After market parts can have a high failure rate so swapping an OEM part with an inferior AM replacement without confirmation that the part is bad can be injecting new problems
2. All repairs need to be confirmed. Your 10 min fuel pressure leak down test is still not to spec. What is your ten min leak down test result at the fuel filter? Your fuel trims are a mess so we need to get that straightened out
3. I want to help you get your truck running and I know your frustrated but there is plenty more we can do. You have not answered all of my questions yet such as the MAF test and graphing O2 sensors
4. Does it start reliably now?
5. How does it run?
6. What is the ECT temp when the truck is warmed up?

George

 

Just an aside.

Misfire detection is disabled when a P1345 is present. That is why P0300 came back after you set cam retard to zero and the P1345 went away.

Carry forth, George!

 

Nice assist, thanks Les

George

 

George
What do you mean MAF test?

 

Post 8, #3.

George