If the idle is set to a specific RPM the controller will normally do what ever it needs to to keep that RPM. If you reduce fuel your timing will likely increase to compensate. I have not used that controller so I am not 100% but all I have used do.

 

24 degrees is quite a bit of advance at idle. You should have no issues with that camshaft with idle timing at 18 degrees, or for that matter getting a good idle at 12.

As you lean out the idle fuel you will know if you go too lean as it will begin to roll the RPM at idle. The IAC won't be able to keep up, in other words. The engine should idle at 14.7:1 with no issues, which will mean your keypad display lights will display yellow from time to time, if my memory serves me correct

 

All the factory settings were way to rich and I've changed nothing on the timing. I'll try 18 deg at idle,I'm useing a edelbrock air/fuel meter and idle is still running at 13.0/1Thanks for your help

 

If the total fuel curve is too rich then I'd start the tuneup on the engine by removing fuel via the global screen. Just an FYI in case you were not aware of that feature.

 

Remember to make your settings based on normal operating temperatures. There are different controls for startup enrichement and timing settings. I've seen many people make their changes and then have to redo everything because they had calibrated with the engine at 70-110 degrees vs. the 180-200 that most engines run at.

Your probably already aware . . . but I thought I'd mention it.

Dylan.

 

Last night I reset the timing at idle and total timing, I also removed fuel at idle at normal temp. Really helped Thanks

 

Sounds good, we have a fond spot in our hearts for that system. Years ago we had one of the first Pro Flo systems made and have always had good luck with them. Although now we are a FAST dealer we still feel for certain applications and customers it's still one of the best choices.

 

I installed it a couple months ago and have been really happy. I've just had a problem with the idle being way to rich. I now got it at 14- on the fule, its better but still a little rich. Thanks

 

Well, you have up to 25% trim available so your still in good shape. If you get to that limit then you'll need raise the idle fueling back up some and tweak down the global fueling. The Global feature is nice when dialing in as you can change that screen to notice trends in how the car drives. A bit easier sometimes then scrolling through the various Vac tables ranges.

 

I have a 3500 Pro-Flo on my 385 SBC, and never really liked the tunability of the engine management system. I ended up keeping the hardware and changing the engine management system to Holley's C950 system. Much better now

But since you are using the original Pro-Flo system, there are some pretty good helps at their "old" website. http://www.edelbrock.com/tech/tech_suport/pro-flo/do_3500faq.html

Here is a direct link to the idle control help: http://www.edelbrock.com/tech/tech_suport/pro-flo/tune_idle.html

One thing that is the most pain about tuning using the Edelbrock software is that the system is so dang heat sensitive. If you get air temps reading above 120*F, it will want to "blower roll" at idle, especially with a bigger cam.

I will say that my experience with Edelbrock's EFI tech support was great.

Best of luck to you, Ed www.edgesz28.com

 

It idles good, the problem is that its really rich. Its at 13.0/1 and I was trying to get it closer to 14.7/1. I wish that the close loop would kick in sooner. Anyway thanks for your help once again.

 

Never had that issue with a Pro Flo Edge. 120 for underhood intake air temps is very common in the summer. It would appear the idle mix was lean for that engine. No matter what the A/F ratio tells you it is the motor wants what the motor wants. Some may not to like to run as lean as others.

 

The Edelbrock does not have the option to idle in closed loop.

I'm useing a edelbrock air/fuel meter and idle is still running at 13.0/1

I had an Edelbrock A/F ratio meter with the pretty lights, but verified with a wide-band that it is not very accurate. You really need a wide band to see your actual air-fuel ratio.

If you are leaning it out and still reading 13-1, either the system is not responding to the changes, or you're simply not getting an accurate measurement from the narrow band meter.

No matter what the A/F ratio tells you it is the motor wants what the motor wants. Some may not to like to run as lean as others.

Amen to that!

Getting the idle right was very frustrating for me with the Pro-Flo. According to Edelbrock tech, this was (is) a common problem, especially with a bigger cam (over 230* @ 0.050). They later revised the chips to give a false temp reading with TPS at idle. I think it was like 50*F, but I cannot remember exactly. But once you moved the throttle it read the real temperature. This was supposed to help with the heat problem as it related to idle. As the temps rose, sometimes to over 135*F, it was leaning out bigtime. And it was even worse after a hot restart. I was told by Edelbrock that changing the air temp (artificially) was designed to help combat this problem.

My engine with the Performer RPM cam likes about 13.0-1 at idle. I verified using a wideband that it could set perfectly using the Pro-Flo system and it would later lean out to over 16-1 when temps rose above 135*F. Needless to say, it ran horrible like that.

Ed

 

What would be a GOOD wide band a/f meter to get ?

 

What would be a GOOD wide band a/f meter to get ?

I bought the LM-1 with RPM converter from Innovate. The base unit is $350, and $430 with the RPM converter.

In hindsight I could have gotten by with the base unit, but having the RPM converter may be useful one day. It allows you to monitor RPM and up to four 0-5 V analog sensors (i.e. MAP, TPS, etc) to use in datalogging.

I am sure that there are few other quality units out there, maybe for even less money; but I would highly recommend the LM-1.

Innovate has a permanent gauge, The XD-16 for $400.

A wide band meter is a very good investment for any type of tuning (carb or EFI)

Good luck, Ed