Well,The Blazer is not running again.

[87BlazerBeast]

I posted before about a problem i had with the Blazer not running,or running right and i thought we solved the problem by blocking off the EGR. It ran fine for about a week until it would start idleing up really bad and eventually cut out and die. I could let it cool off for about an hour and it would start back up and run for maybe a few days,or a few minutes. As of now it won't run at all. Earlier it started up for a few seconds running really bad.

It is firing,and it's getting fuel. It looks like it is getting too much fuel,so the other day i unplugged one of the injectors and it would start up and run. It didn't run good at all,but it did run. So it makes me think it may be getting too much fuel.

So here's what i've replaced.
-Idle air Control valve
-Ignition Module
-Computer
-Map sensor (twice)
-Throttle body base gasket
-Cleaned injectors
-Block off plate for EGR
I'm sure there's more but I can't remember. If I remember I'll add it.

It also isn't throwing up any codes

any help would be appreciated.

 

[89Suburban]

How about the fuel regulator?

 

[Manbearpig]

Yeah check your regulator and check back with us.


My Blazer isn't running either lol

 

[f1shman]

Check your fuel pressure. Your TBI system needs to have between 12-15psi in order to run properly. To check the pressure you'll need a suitable tester. Once you have the tester hooked up properly (following the directions included with the tester) start the engine and notice what the fuel pressure reading is on the gauge. If the pressure is reading at less than 12psi, shut off the truck and use a hose pincher to pinch shut the flexible tubing on your fuel return line. After pinching the return line start the truck again. If the fuel pressure goes up with the line pinched the problem is the fuel pressure regulator. If the pressure does not go up the problem is a bad fuel pump.

 

[87BlazerBeast]

Not sure.
I will hopefully have the money for a carburator an intake this week
**** you throttle body!

 

[Old77]

Oddly enough....I think the TB is saying the same thing to you about now

 

[89Suburban]

Not sure.
I will hopefully have the money for a carburator an intake this week
**** you throttle body!

 

[Manbearpig]

**** you quadrajet!

 

[Old77]

**** you quadrajet!

Holley....

 

[87BlazerBeast]

ha. my friend's dad owns a car shop and he's going to test the vaccum on the map sensor.
Earlier it actually started..running like **** backfiring and running really rough it idled and ran..so idk

 

[87BlazerBeast]

it must have good fuel pressure since it's getting so much fuel

 

[89Suburban]

What about the pickup coil and the ignition coil? Did you check the regulator? This intermittent thing sounds like electrical to me. If it was a vacuum or mechanical problem I would expect it to act the same all the time. Or the same at certain temps.

 

[Old77]

^^^89Sub haz questions and he needz answers.....NOW

 

[89Suburban]

^^^89Sub haz questions and he needz answers.....NOW

I don't even know myself what he should lookat for this problem, lol.

 

[Old77]

I don't even know myself what he should lookat for this problem, lol.

Me either but someone needed to give the youngster a hard time