[SHOSPEED]

any ideas of what it could be or were I should start looking?
checked vacuum lines and everything seems to be connected and in the right place.

has 60# injectors, fyi
how much vacuum should be coming from the red line that goes into the fuel pressure regulator?
i feel some vacuum but not allot

 

[Certified Drunk]

Sound like one of the injectors is not firing...
Your base fuel Pressure should be 39.5 with the no vacuum reference. Depending on the cams, you could see 10-20 pounds of vacuum at idle.

 

[SHOSPEED]

got stage 2 cams from lfp

 

[1qwktrk]

Could be so many things...
Cams weren't degreed properly, bad tune, vac leak, bad injector....
Did you go built because the engine went? Could have a bad o2 as well

 

[SHOSPEED]

Could be so many things...
Cams weren't degreed properly, bad tune, vac leak, bad injector....
Did you go built because the engine went? Could have a bad o2 as well

yes. it threw 2 rods.
its tuned for the old set up of 400hp
but its has so many parts know. but didnt want to send it for the new tune till after i fix this issue.
could the old tune be causing it with the new parts?

 

[SHOSPEED]

any more ideas?

 

[Kwik SC]

Check compression on both banks. If there is a variance of 30psi or more, one of the cams may be off a tooth and causing the lean condition.

 

[badmerc]

just this past weekend, I was running rich on bank 1, lean on bank 2. Compression test showed bank 1 down about 25lbs per bank 2. Tore it down and found chain tensor not holding pressure on bank 1. Replaced, running very good now
good luck

 

[LoganR]

Who is tuning it? It's too easy to see the STFT's off, and the O2 voltages. Checking compression is also an easy task, and should quickly show an entire bank down on compression, which would indicate cam timing as the culprit.

 

[crewsy]

My bet would be the cams aren't degreed properly.

 

[SHOSPEED]

the customer takes it somewhere ealse to dyno it and tune it, dont know the name.
any way to check the degrees on the cams?

 

[LoganR]

the customer takes it somewhere ealse to dyno it and tune it, dont know the name.
any way to check the degrees on the cams?

Do compression check and see if the entire bank is low. Also check O2 voltages

 

[SHOSPEED]

what should be the ideal compression?

 

[SHOSPEED]

got #150 psi across the board on bank 2

 

[Kwik SC]

got #150 psi across the board on bank 2

And bank 1?

 

[SHOSPEED]

And bank 1?

just started to check them. ive got 0 compression on piston 1
and piston #2 is at 150.
the spark plug from #1 dosent even look used!!! compared to all the others.
Im I missing something?

 

[D3VST8R96GT]

0 Compression calls for leak down test.

It doesnt look used which is not good .....

 

[SHOSPEED]

0 Compression calls for leak down test.

It doesnt look used which is not good .....

the spark plug not looking used would mean that the injector and the coil arent firing correct?

 

[Jon82387]

the spark plug not looking used would mean that the injector and the coil arent firing correct?

That really doesn't matter at all..... the big issue is 0 compression.... something is not sealing and you need to do the leakdown to see what. Intake or exhaust valve.

 

[SHOSPEED]

That really doesn't matter at all..... the big issue is 0 compression.... something is not sealing and you need to do the leakdown to see what. Intake or exhaust valve.

did the leak down test.
#1 at top dead center, and got air coming out if the exhaust.