Exhaust value no sealing 4.3 Vortex <HELP>

[j cAT]

Originally Posted by Mr S10

Pulled the o2, The blazer sounded like a beast. Going to say my Cat is ok, but when i was under there I noticed the cats color was like a gun metal grey, it was not they way last week it was like light tan like the rest of the exhaust but newer looking

lets say your valve[s] are messed up. you now have unburned fuel getting into the exhaust. then the job of the cat is to burn it off. if too much/too long then the cat gets very hot and melts the internal baffle/honey comp material which then causes restriction of exhaust gases.

engine running to rich also will do it.

[Mr S10]

Im going to do a commpress test in 3 day, Going racing this weekend it my dads Memorial Enduro race (Miss you pops)

I'll let you know how the test goes j cAT,
What is a good commpress range for a 4.3 V6 vortec CPI Vin W

[j cAT]

Originally Posted by Mr S10

Im going to do a commpress test in 3 day, Going racing this weekend it my dads Memorial Enduro race (Miss you pops)

I'll let you know how the test goes j cAT,
What is a good commpress range for a 4.3 V6 vortec CPI Vin W

compression don't vary much between engines . what you look for is compare all readings with the cylinders. if you find a low one then that would be the problem.

the spark plugs tell the story if you do have a dead cylinder.

[Mr S10]

Compression test Done, The motor was cold 150 degrees on the exhaust, cylinders 1=150 2=150 3=125 4=145 5=145 6=145 How dose all the cylinders look but 3 are they good?
The last time I was in the valve cover the exhaust rocker arm was rubbing on the spring cap on #3 thats going to be my problem. I had my heads done once and they failed do to a leaking valve on 3 had them reset the valves so they would seat. Look like my head guys suck butt hole.
Is it possible to try to fix the valve on the truck by pulling the rocker arms off cylinder 3 running compressed air in the cylinder and pulling my valve sping off and resetting my valve keeper? Of do I just pull the head and get a new valve or a head job.

[j cAT]

Originally Posted by Mr S10

Compression test Done, The motor was cold 150 degrees on the exhaust, cylinders 1=150 2=150 3=125 4=145 5=145 6=145 How dose all the cylinders look but 3 are they good?
The last time I was in the valve cover the exhaust rocker arm was rubbing on the spring cap on #3 thats going to be my problem. I had my heads done once and they failed do to a leaking valve on 3 had them reset the valves so they would seat. Look like my head guys suck butt hole.
Is it possible to try to fix the valve on the truck by pulling the rocker arms off cylinder 3 running compressed air in the cylinder and pulling my valve sping off and resetting my valve keeper? Of do I just pull the head and get a new valve or a head job.

if the valve spring is bad on 3 then use air pressure to hold the valves in place so you can replace the spring or whatever is messed up.

125 is not all that bad but still a little low. could be the valve is bad.

[Mr S10]

Originally Posted by j cAT

if the valve spring is bad on 3 then use air pressure to hold the valves in place so you can replace the spring or whatever is messed up.

125 is not all that bad but still a little low. could be the valve is bad.

Is there a way to test the valve to see if its bad?
Or could i be just a weak spring.

[j cAT]

Originally Posted by Mr S10

Is there a way to test the valve to see if its bad?
Or could i be just a weak spring.

swap spring to next cylinder

[Mr S10]

Originally Posted by j cAT

swap spring to next cylinder

was working on it all morning did a temp reading on the exhaust manifold I got 380 on all but the #6 was 355 degrees (could be because its in the back) is that bad?

And when I turn the blazer off I get a rushing air sound out of the intake neck (cylinder depressurization) could this be because one of the injector clips are broke and the injector poped out of the hole Pic do I need to replace the spider I have the last one I take out it had one broken clip too, or can I just pull off one of the good clips off the old one?

[Mr S10]

Getting a new EMC. next week a rem ACdelco Because I was getting a Code 42. The code only show up when I drive about 40 miles. The check engine light never comes on, but when I check codes I get the Normal 12 and 42.(FM) only after 40 or so miles. I Tracked down all the wires and they all looked fine, got a new ICM and pick up coil.
Is there any trick to putting the new ECM anf prom/chip, dont want the F the new one up.