Time to go stage II with A/C!

[norbs]

I have them hidden, to avoid clutter, just look at the values in the boxes they show the correct value.

 

[norbs]

It sure couldn't hurt. If you see very low pressures, it could tell you the cam is timed wrong.

that is true, cam was installed per spec, plus 1 degree advanced, static compression is 8.89

 

[Alky V6]

The dynamic compression will at least confirm that the cam is installed right. Then you can put that worry aside and concentrate on the simpler stuff.

 

[Alky V6]

Too many parameter and numbers are the same color. List off the trace lines from top to bottom. Little help here.

 

[norbs]

Are you running in sequential or batch? Gasoline, right? What size injectors? What is the minimum ipw for the injectors?

seq, gasoline 120 lb, supposedly .6 ms

 

[norbs]

Too many parameter and numbers are the same color. List off the trace lines from top to bottom. Little help here.

CAM SYNC
BATT VOLTS
AF RATIO
MAP PSIA
MAP KPA
RPM
FUEL PRESSURE

 

[Alky V6]

seq, gasoline 120 lb, supposedly .6 ms

Some injectors can go rich when you get the pw too low. Not sure if that is a problem with those injectors, but something to keep in mind.

 

[Alky V6]

I agree, vacuum too low at this stage of tuning. Get the vacuum up.
Either correct vacuum leak, target a higher idle for now, or correct cam timing.
First things first. Start out with the basics. Compression, fuel, spark. We know you're getting fuel and spark. Verify your compression.
Verify your compression.

 

[turbobitt]

I agree, vacuum too low at this stage of tuning. Get the vacuum up.
Either correct vacuum leak, target a higher idle for now, or correct cam timing.
First things first. Start out with the basics. Compression, fuel, spark. We know you're getting fuel and spark. Verify your compression.
Verify your compression.

What does 71 kpa convert to in Inhg? Just to give you an idea my car idles with about 9 Inhg.

AG

 

[Alky V6]

What does 71 kpa convert to in Inhg? Just to give you an idea my car idles with about 9 Inhg.

AG

71 is pretty low for the cam he's running. My engine didn't even run that low with a much larger cam.
Especially with the problems he's having, he should be getting the tuneup stable at a higher MAP level, then he can work it down after that.

 

[turbobitt]

71 is pretty low for the cam he's running. My engine didn't even run that low with a much larger cam.
Especially with the problems he's having, he should be getting the tuneup stable at a higher MAP level, then he can work it down after that.

I'm not disagreeing but trying to get an idea on the scope of the issue.
AG

 

[Alky V6]

My engine idled at 1350 rpm with MAP between 66-70 kPa. And a much bigger cam.

 

[turbobitt]

I'm not disagreeing but trying to get an idea on the scope of the issue.
AG

I think going to a smaller injector would be a good starting point but not entirely convinced its an injector problem yet.
AG

 

[Alky V6]

Perform the compression test and leak down test first.

 

[turbobitt]

I think going to a smaller injector would be a good starting point but not entirely convinced its an injector problem yet.
AG

Troubleshooting is so difficult to do without being there to feel out the problem. I could think of a few potential issues that may cause the low vacuum. Stage 2 heads and intakes have been known to be highly modified and angle milled. Intake manifold sealing could be compromised.
AG

 

[Alky V6]

I can't overstate this enough. Verify the cylinder pressures first. Follow your troubleshooting in an organized manner and you'll get the problem solved quicker.

 

[norbs]

Perform the compression test and leak down test first.

Just did compression test range is between 145-150 on all cyl!

 

[norbs]

Just did compression test range is between 145-150 on all cyl! What is next?

 

[norbs]

Troubleshooting is so difficult to do without being there to feel out the problem. I could think of a few potential issues that may cause the low vacuum. Stage 2 heads and intakes have been known to be highly modified and angle milled. Intake manifold sealing could be compromised.
AG

As far as I can tell the intake has never been milled... Should I try a another new set of plugs? they are heat range 8 and gapped at .032

 

[Alky V6]

Install a new set of plugs. Standard heat range for now. You don't need cold plugs making this more difficult.
Make sure you don't have a vacuum leak somewhere.
Disable IAC. Set the idle high for now using the throttle blade. Shoot for 1500 rpm.
Are you getting good spark?