87 blazer wont start

[mhowe1182]

It turns over but wont start, i have changed the fuel pump, fuel filter, injectors, and i also put new connectors for the injector, and new plugs. But still will not start???? Any help would be great, thanks.

[MT-2500]

Originally Posted by mhowe1182

It turns over but wont start, i have changed the fuel pump, fuel filter, injectors, and i also put new connectors for the injector, and new plugs. But still will not start???? Any help would be great, thanks.

Check for good hot blue spark to all plugs.
Check and comfirm good fuel pressure.
Does it have injector pulse cranking?

[mhowe1182]

Originally Posted by MT-2500

Check for good hot blue spark to all plugs.
Check and comfirm good fuel pressure.
Does it have injector pulse cranking?

i have good pressure, and the spark was blueish white. I was told to change my ignition module. Could this be my problem??

[MT-2500]

Originally Posted by mhowe1182

i have good pressure, and the spark was blueish white. I was told to change my ignition module. Could this be my problem??

Not if you have good spark.
What was fuel presure reading?
SPARK AT ALL PLUGS?

Do you have injector pulse cranking?

[mhowe1182]

How do i check for the injector pulse??

[MT-2500]

Originally Posted by mhowe1182

How do i check for the injector pulse??

Injector noid light tester.
Your local parts place should have one.
Also make sure you have 12 volts to positive side of injector.
If not.
The injector fuse may be blowed.!!!!!!

[mhowe1182]

I checked all those things and they were fine, i took the fuel off and had someone turn the key on and i wasnt getting any gas out of it, i have put a new pump in like two weeks ago and a new filter.

[MT-2500]

Originally Posted by mhowe1182

I checked all those things and they were fine, i took the fuel off and had someone turn the key on and i wasnt getting any gas out of it, i have put a new pump in like two weeks ago and a new filter.

Checking for fuel/pressure should be done with a fuel pressure gauge.
Just turning key on is not a good fuel pressure test.
Just.
Key on only gives the fuel pump a 2 second prime up.
May not be enough time to build up proper pressure

You need to check for fuel pump running and for proper pressure with engine cranking.

Does it run on engine cranking and what is fuel pressure?

[mhowe1182]

I think i might gotten the pump with low psi, i was looking at it and it says 12psi and i think i need 60 psi, so i will check the pressure tomorrow, and get back to ya..