Troubleshooting a miss, etc

[TurboCajun]

car fully warmed up, in drive === vac -12-13 , 02s - 828-832, Af-07, L8-46-48, bat-13.7, int-128, bl-135, clt-184, ats-97, rpm 800-825, tps-.42, iac-45, cc-05 and does not move for a minute are so and when it does in only counts by 2-5. Vac @idle in park-14-15

[Steve Wood]

Okay...

First thing I see is that the car is not making enuf vacuum for some reason.  It should be reading a steady 16-17 in-hg at warm idle in gear IF the car has as stock cam.  If the needle is bouncing 2-5 " hg, I would be looking for a miss, or a big vacuum leak assuming the compression is relatively similar on all cylinders.

Have you warmed up the car and disconnected each injector to see if there is one cylinder, or more, that does not affect the idle speed when the injector is disconnected?

Now, the car appears to be rich at idle, but, the maf is reading on the high side of the range so the ecm may be adding a bit more fuel....the cc may not be germane at idle because Eric's chip runs a form of open loop at idle for a smoother steader idle speed.  I would install one of the denso O2 sensors so we know we have a good sensor.  Also, we may be getting some effect from the miss....and we don't know what the fuel pressure is altho I would say it is close.

Other than getting a new O2 sensor, I would leave everything else alone and try to see if you can find a miss so we don't waste time  trying to tune with a miss in the car.

Spray some carb cleaner around the egr, the base of the plenum, the throttle body, on hoses, etc. to see if the idle changes.  Don't remember if you checked the pcv to see if it is working properly and not stuck partially open?

Try Ed's suggestion to see if you get any trash out the fuel rail.  Did you get the injectors new, or used?

[TurboCajun]

Okay...

First thing I see is that the car is not making enuf vacuum for some reason.  It should be reading a steady 16-17 in-hg at warm idle in gear IF the car has as stock cam.  If the needle is bouncing 2-5 " hg, I would be looking for a miss, or a big vacuum leak assuming the compression is relatively similar on all cylinders.

Have you warmed up the car and disconnected each injector to see if there is one cylinder, or more, that does not affect the idle speed when the injector is disconnected?

Now, the car appears to be rich at idle, but, the maf is reading on the high side of the range so the ecm may be adding a bit more fuel....the cc may not be germane at idle because Eric's chip runs a form of open loop at idle for a smoother steader idle speed.  I would install one of the denso O2 sensors so we know we have a good sensor.  Also, we may be getting some effect from the miss....and we don't know what the fuel pressure is altho I would say it is close.

Other than getting a new O2 sensor, I would leave everything else alone and try to see if you can find a miss so we don't waste time  trying to tune with a miss in the car.

Spray some carb cleaner around the egr, the base of the plenum, the throttle body, on hoses, etc. to see if the idle changes.  Don't remember if you checked the pcv to see if it is working properly and not stuck partially open?

Try Ed's suggestion to see if you get any trash out the fuel rail.  Did you get the injectors new, or used?

ok fuel pressure line off 42, line on 36, at 21psi boost 60 psi of fuel pressure (this is a old cheap gauge). I made a pull in third gear then stopped and in drive the numbers were o2-816, af-8, L8-51-54,bat-13.6, bl-132, cc-149 not changing. vac 12-13. . o2 at WOT @85mph were 768,
I have checked the injectors and there was a change in every one, I did buy the injectors new from nos4gn in 2010.
I have dont the fuel check and only found one little peice of rubber but that may have come from the hose , other than that is was clean.

[TurboCajun]

one thing i did notice was at 35 mph in third gear the blm were @ 121-125 so it is pulling fuel

[Steve Wood]

could be a gauge error...on the fuel pressure

but, the question is...why no vacuum

[Steve Wood]

one thing i did notice was at 35 mph in third gear the blm were @ 121-125 so it is pulling fuel

I would not consider that significant...

[Steve Wood]

may have to make you a pressure tester and see if the intake/heads will hold pressure fairly well with the rocker arms removed, or does the air come hissing out some place

[TurboCajun]

new o2 sensor made on diff. (sorry Steve I had already purchased a bosch). I sprayed starter fluid and had on luck finding a leak. Also tried unplugging the injectors again, everyone made a difference. I will have to wait for more time to do a pressure test. thanks Steve

[Steve Wood]

bosch is the worst of all....but, I doubt it is giving bad info right now

[ULYCYC]

Try and plug up the PVC line and see if the vacuum goes up.  one inch of vacuum would be normal but a few inches will point to a bad PVC and the source of your low vacuum.

[TurboCajun]

put new pcv valve in and no change, crimped line to pcv and no change, vac at idle is 15 when idling good, 13 when running rough

[Steve Wood]

be sure to spray around the vacuum block as well as make sure the screws are tight.

Might pull all the hoses off the vacuum block and put your hand over the ports to see if the vacuum goes up and stabilizes.

If you put vacuum brakes on the car, close off that line as well

Did the car show this same vacuum before you changed over?  Wondering if the intake gasket is leaking

Does it have noisy lifters?

Any change if you spray cleaner over the throttleshaft ends?

[TurboCajun]

i spray everywhere, i even sprayed around the intake where i could reach, yes i do have vacuum brakes and will check that tomorrow, yes i do have lifter noise, there is one that is really bad when i do compression test or turn the engine over without starting , it takes a couple of minutes to prime back up. I am going to take my throttle body off and clean vacuum block and IAC housing. 

[Steve Wood]

so I wonder if that lifter is not always pumped up?  When it gets bad enuf to throw the push rod out, you will know

[SuperSix]

The lack of proper vacuum is a sign.. Of what? I don't know.