Car Dies

[blue62]

Originally Posted by gabedrummin

I will try to get my hands on some test equipment this week end , and report back the findings .Both heads had a valve job less than 2 thousand miles ago by Hoffman machine . But anything is possible . My idea was to swap injector from 4 to 5 to see if the problem follows the injector .Thank you for all your comments . You are all extremely knowledgeable and I am great full for the help..!

If I am correct with my guess that the issue is in the valves you will probably be able to see the affects the easiest with a compression test of all cylinders.
Any cylinder with valve issues will show a lower compression.

If you do a vacuum test your looking for 18-22 in.hg with a rock solid needle. like it is painted on the gauge.
If the needle quivers or ticks or drifts that points to valve train issues.

When you do the compression test:
Be sure to pull the fuel injector fuse
Block the throttle body butterfly wide open
crank the engine the same amount of time for each cylinder.
Record compression on each cylinder.

Let us know how you go.
Always interested in outcomes

It will be grand if it is just a leaking injector
Easy fix

[gabedrummin]

So vacuum test shows 21 Hg of vacuum , needle is not moving even when revving the engine needle dose not move .

[blue62]

Originally Posted by gabedrummin

So vacuum test shows 21 Hg of vacuum , needle is not moving even when revving the engine needle dose not move .

Your pulling good vacuum so it does not look like you have any vacuum issues.
Steady needle is good
When you do a snap throttle test the needle should drop to near zero then rebound a little above your idle vacuum then settle at idle vacuum.

Here is a site that you can go to and read up on vacuum testing.
It will be better that a back and forth here on the forum.

what-when-how.com/automobile/engine-vacuum-test

That article should help you out some.
sounds like your valve train is ok but do further vacuum tests (described in the article) to prove that out.
A compression test would remove any doubt.

If it is not a mechanical issue (valve train) I would start looking at fueling.
Fuel pressure and volume tests and also the injectors for leaks.

keep us in the loop

[gabedrummin]

Compression test shows cylinder 4,5,6 at 150 psi and 1,160 2 ,155 3 ,150 I used two different gauges and still got a difference of about 10 psi from bank 1 to 2 I also ran the car with cylinder 4 coil unplugged and it still backfire . Very confusing results . Bank one plugs looked black color where as bank 2 the insulators are cleaner .

[blue62]

Originally Posted by gabedrummin

Compression test shows cylinder 4,5,6 at 150 psi and 1,160 2 ,155 3 ,150 I used two different gauges and still got a difference of about 10 psi from bank 1 to 2 I also ran the car with cylinder 4 coil unplugged and it still backfire . Very confusing results . Bank one plugs looked black color where as bank 2 the insulators are cleaner .

So your vacuum test is good.
10 psi difference as the greatest spread is ok.
So I think you valve train is good.
Blows my valve leaking theory all to hell thou.

Are all three plugs from bank 1 blackish???
Blackish plugs are either oil fouled or very rich fuel/air mixture.
Or not firing every time.
So you have to figure out if they look oil fouled or not burning well because of a to rich mixture.

What kind of fuel mileage do you get.????

I would get a spark tester the kind you put between the coil pack and the spark plug so you can test current to the plugs on bank 1

there is a chance your coil packs are not getting energized.
If so that would be a wiring issue.
If that checks out ok then I would look at the injectors.