4.3 vortec misses on 3 cyl

[BlazerLT]

Check your EGR valve.

[Mikado14]

You have done a lot here in a short time and please don't take what I say here the wrong way. Do you think that you may have solved your problem but introduced another?

For example, are you sure you put the proper injector in the proper port?

Sure you didn't cross any wires on the one side?

I'm sitting here running this over in my feeble mind and trying to see what is common to the right bank only.

[gbic1]

Yes, I want you to know I am happy for any help you may offer. I have checked the firing order. 1 6 5 4 3 2 in clockwise direction. First thing I did was check the fuel pressure because I have seen bad nutkits before and pressure would leak down and it would be wet on driverside not passenger side. Blown regulator will cause leak on pass side. I installed a genuine Delco$$$$$$ CPI unit and I installed lines the way the old ones were.I dont think it matters although because it fires all poppets at the same time on this year. Newer ones are different.......slowly going bald one handful at a time. Called a neighbor of mine who has been a GM tech for 30 years and he didnt have any answers either?

[gbic1]

BTW I tryed to pull EGR al the way off and one bolt on the passenger side is very tight and could not get but 3 turns out of it. But i could pull out the other bolt and was able to get my finger in it and egr is clean. I have changed many of these and it is not the problem. My scanner shows the egr to be in the closed position. Thanks

[Mikado14]

Here is an idea,,, You appear to have a good background so I will make it short and sweet.

Do you think that perhaps the lower intake gasket on the one side let loose?

[gbic1]

Funny you say that. I am going to try to run propane into the valve cover to see if it runs different. I already checked for external leaks. My only problem with that is it should be lean and not rich.

[gbic1]

Says HELP? Anyone? Any one?

[Mikado14]

Originally Posted by gbic1

Says HELP? Anyone? Any one?

Waiting to hear back on what happened with the propane.

[gbic1]

Propane enrichment ....No help. Vacuum leak was a good Idea but not on this one. Has any one seen a bad run of CPI units. These were both Delco units. I couldnt find a test disributer. So I havent subed that yet but I have good spark and the injector is pulsing or it wouldnt be flooded. i a going to change the wires just because biu it is just throwing money at it. Gary

[gbic1]

Well, I popped the exhuast pipe loose on passenger side and it seams like it is clearing up. Plugs are fouled but with soot not gas dripping off them. I was told these have double wall pipe and one may have colasped. Any body hear of that? The converter has been cut off and a small pipe was welded in its place. That is why I didnt drop pipe 2 weeks ago. I will let ya know tommorrow.

[BlazerLT]

Did you check the nut kit yet?

[Mikado14]

Originally Posted by gbic1

Well, I popped the exhuast pipe loose on passenger side and it seams like it is clearing up. Plugs are fouled but with soot not gas dripping off them. I was told these have double wall pipe and one may have colasped. Any body hear of that? The converter has been cut off and a small pipe was welded in its place. That is why I didnt drop pipe 2 weeks ago. I will let ya know tommorrow.

Son of bee with an itch. I have seen that before but did not think of it cause I didn't know these were doubled wall. It sounds very plausible.

[gbic1]

Well......NO, It just sounded better. Still flooding. Got it hot and pulled upper intake off again, 7th time and it is still soaked. Have third CPI unit coming now. I got a different brand this time. And yes the Nut kit is new with the second cpi unit.

[BlazerLT]

Did you use the o-rings around where the nutkit attaches to the injector?

[gbic1]

Yes it has new Orings and yet a third CPI unit. This one from another vender. No change. I give UP.