4.3 vortec misses on 3 cyl

[BlazerLT]

I still think it has something to do with the cap and rotor.

If the rotor or cap was out of alignment somehow, it would explain why the one bank is not burning properly if the spark is having to jump an increased distance in the cap.

[gbic1]

The cap and rotor are lined up fine. I have had them off several times. It is missing every other wire in the firing order not one side of the cap, one side of the engine.

[gbic1]

We had the plenum off today and caught it spraying fuel out of the regulator area when cranking. It only did it once and was not able to check the fuel pressure so I dont know what is was reading. Too much pump pressure? Fuel pressure gage is viberating when engine is idleing but not under accel or decell.

[Mikado14]

Originally Posted by gbic1

We had the plenum off today and caught it spraying fuel out of the regulator area when cranking. It only did it once and was not able to check the fuel pressure so I dont know what is was reading. Too much pump pressure? Fuel pressure gage is viberating when engine is idleing but not under accel or decell.

Isn't that your third CPI unit? Well, if it is doing that, that would explain that bank being flooded.

I have never noticed the guage vibrating while at idle on a CPI unit. I believe it would be possible if the regulator was screwing up. I know you have dumped a lot into this but perhaps, since you saw it with your own eyes, you might want to change the regulator only.

[gbic1]

Thanks every one for your help. I found an old post and emailed the poster. He had a similar problem with a broken valve spring. Replaced the valve spring on cylinder #6 and it runs like a top.

[BlazerLT]

?

You said the regulator was spraying fuel.

That is the problem, replace it. It is supposed to be dry at all times.

[Mikado14]

Originally Posted by gbic1

Thanks every one for your help. I found an old post and emailed the poster. He had a similar problem with a broken valve spring. Replaced the valve spring on cylinder #6 and it runs like a top.

I assume that this was an intake spring?

[gbic1]

Yes it was, and it passed the cranking compression test 3 times before it failed. It did not fail till we tryed a different compression tester.?

[BlazerLT]

Again, you said the regulator was spraying fuel again.

Did you replace the whole injector or just the regulator on the side.

[gbic1]

Apparently the fuel was building up in cylinder number 6 and after enough of it built up it would blow out of the cylinder and soak the injector. We did not replace any thing in the fuel system this time only the valve springs. Yes this was a very strange problem but I guess I am not the first. It would never spray out when we were directly looking at it only when we turned our head for a second and that is why we could see the fuel on the injector but not where it came from. The spring that broke was broken under the little cover on top so you could not see it with out removing the sping from the engine. I wont soon forget this problem.