Just strait up can't figure it out. $50 reward offered.

[Dudeland]

[Dudeland]

So there it is in all its glory.   So far no winner.    I checked the booster. The valve holds one way and opens the other. 

The booster holds vacuum I even had someone push on the pedal and the amount of vacuum barely changed. 

 

New theory.

 

I have the inlet and the outlet switched on the canister style filter so that it draws from the top of the filter, rather than the bottom which.  This means it would get fuel but sucks air temporarily as it is drawn in under hard decel as the fuel and air get drawn into the pickup. 

 

 

 

 

[02Pilot]

I asked above but didn't see an answer: how are you controlling air at idle? Is there an idle control valve or some other arrangement?

[Dudeland]

Just now, Andrej said:

I asked above but didn't see an answer: how are you controlling air at idle? Is there an idle control valve or some other arrangement?

Sorry I missed your question:

 

Yes, the system has an IAC built into the unit.  The manufacturer states to open and close the throttle plate using an adjustment screw until the IAC reads between 2 and 10.   Mine is at 5

 

 

[irdave]

39 minutes ago, Dudeland said:

Sorry I missed your question:

 

Yes, the system has an IAC built into the unit.  The manufacturer states to open and close the throttle plate using an adjustment screw until the IAC reads between 2 and 10.   Mine is at 5

 

 

 

Maybe you just need to be at 10?

 

Did you get the data Jim asked about?

[jimk]

1 hour ago, Dudeland said:

I have the inlet and the outlet switched on the canister style filter so that it draws from the top of the filter, rather than the bottom whic

It also means if the flow is going in the outlet and out the inlet, the flow is going the wrong way thru the filter media.  Filters are designed so the fluid flows from the outer perimeter thru the filter media to the inner side.  Reverse the flow and the filter media expands against the can.

[Dudeland]

 
Maybe you just need to be at 10?
 
Did you get the data Jim asked about?

Yes just need to get it off the sd card and post.




Sent from my iPhone using Tapatalk

[Dudeland]

1 hour ago, irdave said:

 

Maybe you just need to be at 10?

 

Did you get the data Jim asked about?

I did try it at 10, and blocked it off completely, and went just with the throttle position taking the IAC out of the equation (as per Holley forum suggestions).  Still had the same problem.   Also, I adjusted how fast it responds (on a scale from 1-5) and it made no difference.  

 

 

[tzei]

Ignition/ idle spark?

https://www.efisystempro.com/efi-pro-hangout/holley-sniper-installation-startup-troubleshooting

[02Pilot]

Probably nothing, but have you confirmed consistent operating voltage at idle? EFI systems can be finicky about voltage, and if it's dropping at idle it might be affecting something down the line.

 

Also highly unlikely, as it would probably produce much more severe symptoms, but do you have a vacuum-operated FPR? I had a diaphragm in one develop a pinhole that sent extra fuel to the intake at idle.

[Dudeland]

5 hours ago, Andrej said:

Probably nothing, but have you confirmed consistent operating voltage at idle? EFI systems can be finicky about voltage, and if it's dropping at idle it might be affecting something down the line.

 

Also highly unlikely, as it would probably produce much more severe symptoms, but do you have a vacuum-operated FPR? I had a diaphragm in one develop a pinhole that sent extra fuel to the intake at idle.

Yes the voltage is stable at 13.9 volts (except when cranking over). The fuel pump puts out +- 60 psi, and there is a fuel pressure regulator in the unit itself. I have a fuel pressure gauge, and it is a consistent 62-64 PSI.   

 

The fuel injection is a return style system. 

 

Fun fact:  I found out why my shifter would rattle a bit,  the return line was bouncing off the u-joint.   Needless to say I will be ordering a new length of -6 line to replace it.  I have a p-clip holding it for now. 

 

 

[Dudeland]

So I checked the fuel inlet and outlet into the canister filter, and it was done correctly.   

 

It goes lean when I stomp on the brake pedal. 

 

 

[Dudeland]

5 hours ago, tzei said:

Ignition/ idle spark?

https://www.efisystempro.com/efi-pro-hangout/holley-sniper-installation-startup-troubleshooting

I actually used this method to set the idle and it helped a little bit, but was not the solution.   I don't have idle spark yet because I didn't install the crank trigger ignition system.  I got the last part I need today to install it, so perhaps this weekend I will put in the crank trigger and see what happens. 

 

 

[flagoworld]

Dying at idle is pretty common symptom of lean running... vacuum leak. Does holley EFI self adjust its fuel trims? You can deduce vacuum leaks by trims being at extreme edges for example. It would be good to see those values and the logs of all this info... fuel trims, pressures, map, maf, etc. Get us those logs! 

 

Theres no use speculating until we have real data.. since you have EFI you have that data and it should become pretty obvious pretty quick. I have done this with my VW daily to disgnose problems. If you need tips on data points to log....

Edited May 7, 2019 by flagoworld

[rstclark]

Really   Has Esty won the $50 yet ?