Hello to you all. I have been lurking here for a few years whenever I have trouble with my 98 Blazer factory 4.3. And I have filtered through many awesome results to get fixes done in the past. I am now at a loss and seek some expertise help in the next direction and problem I am facing.

About a year ago the truck overheated on the freeway. It became a new head job, radiator, water pump and all tune up parts. After, it ran rough when hot but ran anyway. There were no error codes. Then going up a hill a few months later it starting sputtering and then died. Had to be towed.

Checked the FP relay fuse and ended up getting a new fuel pump and filter. The FP would come on for the couple secs and then i would crank the engine to get the truck to run for about 3 secs and then die. The pressure in the line remains strong.

I was told it may be from a bad EIC and heat sensors, which did not get replaced originally after the overheat. Does this sound right? What should be my next choice for plan of attack? Any help or brainstorming with this would be much appreciated. Thank you for your time.

 

The first step is to measure fuel pressure and leakdown with a gauge. You need to verify that the fuel pump is producing the proper pressure and that the fuel system is holding that pressure for ten minutes. Once you know that you can rule out a fuel issue.

After you did the heads and the other top-end stuff, did you do a crank position relearn procedure? Any time you remove the distributor you need to do a computer relearn to get everything calibrated properly.

 

Thank you Toby. I did not do a crank position relearn. I will investigate this and continue with my replies. Also, I have read varying info on correct fuel pressure. I believe it is 60. Is this correct?

 

60 is correct. It should not drop more than a few psi in ten minutes.